resolves #1086 replace printStackTrace by java.util.logging.Logger

src/net/sourceforge/plantuml/AFileZipEntry.java

@@ -40,6 +40,7 @@ import java.io.InputStream;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipInputStream;
 
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.security.SFile;
 
 public class AFileZipEntry implements AFile {
@@ -75,7 +76,7 @@ public class AFileZipEntry implements AFile {
 				zis.closeEntry();
 				zis.close();
 			} catch (IOException e) {
-				e.printStackTrace();
+				Logger.error(e);
 			}
 		return null;
 	}
@@ -88,7 +89,7 @@ public class AFileZipEntry implements AFile {
 					is.close();
 					return true;
 				} catch (IOException e) {
-					e.printStackTrace();
+					Logger.error(e);
 				}
 			}
 		}

src/net/sourceforge/plantuml/BlockUml.java

@@ -55,6 +55,7 @@ import net.sourceforge.plantuml.code.TranscoderUtil;
 import net.sourceforge.plantuml.command.regex.Matcher2;
 import net.sourceforge.plantuml.core.Diagram;
 import net.sourceforge.plantuml.error.PSystemErrorPreprocessor;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.preproc.Defines;
 import net.sourceforge.plantuml.preproc.FileWithSuffix;
 import net.sourceforge.plantuml.preproc2.PreprocessorModeSet;
@@ -197,7 +198,7 @@ public class BlockUml {
 			final byte[] digest = msgDigest.digest();
 			return coder.encode(digest);
 		} catch (Exception e) {
-			e.printStackTrace();
+			Logger.error(e);
 			return "NOETAG";
 		}
 	}

src/net/sourceforge/plantuml/DirWatcher2.java

@@ -49,6 +49,7 @@ import java.util.concurrent.Executors;
 import java.util.concurrent.Future;
 import java.util.concurrent.TimeUnit;
 
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.preproc.FileWithSuffix;
 
 public class DirWatcher2 {
@@ -98,7 +99,7 @@ public class DirWatcher2 {
 										modifieds.put(f, new FileWatcher(files));
 										return Collections.unmodifiableList(generatedImages);
 									} catch (Exception e) {
-										e.printStackTrace();
+										Logger.error(e);
 										return Collections.emptyList();
 									}
 								}

src/net/sourceforge/plantuml/EmbeddedDiagram.java

@@ -49,6 +49,7 @@ import net.sourceforge.plantuml.graphic.AbstractTextBlock;
 import net.sourceforge.plantuml.graphic.HorizontalAlignment;
 import net.sourceforge.plantuml.graphic.Line;
 import net.sourceforge.plantuml.graphic.StringBounder;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.preproc.Defines;
 import net.sourceforge.plantuml.security.SImageIO;
 import net.sourceforge.plantuml.ugraphic.AffineTransformType;
@@ -81,9 +82,9 @@ class EmbeddedDiagramDraw extends AbstractTextBlock implements Line, Atom {
 			final BufferedImage im = getImage();
 			return new Dimension2DDouble(im.getWidth(), im.getHeight());
 		} catch (IOException e) {
-			e.printStackTrace();
+			Logger.error(e);
 		} catch (InterruptedException e) {
-			e.printStackTrace();
+			Logger.error(e);
 		}
 		return new Dimension2DDouble(42, 42);
 	}
@@ -101,9 +102,9 @@ class EmbeddedDiagramDraw extends AbstractTextBlock implements Line, Atom {
 			final UShape image = new UImage(new PixelImage(im, AffineTransformType.TYPE_BILINEAR));
 			ug.draw(image);
 		} catch (IOException e) {
-			e.printStackTrace();
+			Logger.error(e);
 		} catch (InterruptedException e) {
-			e.printStackTrace();
+			Logger.error(e);
 		}
 
 	}

src/net/sourceforge/plantuml/FileFormat.java

@@ -48,6 +48,7 @@ import net.sourceforge.plantuml.braille.BrailleCharFactory;
 import net.sourceforge.plantuml.braille.UGraphicBraille;
 import net.sourceforge.plantuml.graphic.StringBounder;
 import net.sourceforge.plantuml.graphic.StringBounderRaw;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.png.MetadataTag;
 import net.sourceforge.plantuml.security.SFile;
 import net.sourceforge.plantuml.svg.SvgGraphics;
@@ -299,7 +300,7 @@ public enum FileFormat {
 
 			}
 		} catch (IOException e) {
-			e.printStackTrace();
+			Logger.error(e);
 		}
 		return false;
 	}

src/net/sourceforge/plantuml/GeneratedImageImpl.java

@@ -40,6 +40,7 @@ import java.io.IOException;
 
 import net.sourceforge.plantuml.core.Diagram;
 import net.sourceforge.plantuml.error.PSystemError;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.security.SFile;
 
 public class GeneratedImageImpl implements GeneratedImage {
@@ -88,7 +89,7 @@ public class GeneratedImageImpl implements GeneratedImage {
 				return cmp;
 			}
 		} catch (IOException e) {
-			e.printStackTrace();
+			Logger.error(e);
 		}
 		return this.description.compareTo(this2.getDescription());
 	}

src/net/sourceforge/plantuml/Log.java

@@ -35,23 +35,34 @@
  */
 package net.sourceforge.plantuml;
 
-public abstract class Log {
+import net.sourceforge.plantuml.log.Logger;
+
+public class Log {
 
 	private static final long start = System.currentTimeMillis();
 
 	public synchronized static void debug(String s) {
+		// noop
+	}
+
+	public static void println(Object s) {
+		// noop
+	}
+
+	public static void header(String s) {
+		// noop
 	}
 
 	public synchronized static void info(String s) {
 		if (OptionFlags.getInstance().isVerbose()) {
 			ProgressBar.clear();
-			System.err.println(format(s));
+			Logger.error(format(s));
 		}
 	}
 
 	public synchronized static void error(String s) {
 		ProgressBar.clear();
-		System.err.println(s);
+		Logger.error(s);
 	}
 
 	private static String format(String s) {
@@ -93,20 +104,5 @@ public abstract class Log {
 		sb.append(" Mo - ");
 		sb.append(s);
 		return sb.toString();
-
-	}
-
-	public static void println(Object s) {
-		// if (header2.get() == null) {
-		// System.err.println("L = " + s);
-		// } else {
-		// System.err.println(header2.get() + " " + s);
-		// }
-	}
-
-	// private static final ThreadLocal<String> header2 = new ThreadLocal<>();
-	//
-	public static void header(String s) {
-		// header2.set(s);
 	}
 }

src/net/sourceforge/plantuml/OptionFlags.java

@@ -41,6 +41,7 @@ import java.util.concurrent.atomic.AtomicBoolean;
 
 import net.sourceforge.plantuml.core.Diagram;
 import net.sourceforge.plantuml.cucadiagram.dot.GraphvizUtils;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.security.SFile;
 import net.sourceforge.plantuml.security.SecurityUtils;
 
@@ -217,7 +218,7 @@ public class OptionFlags {
 				ps.println();
 			} catch (FileNotFoundException e) {
 				Log.error("Cannot open " + logData);
-				e.printStackTrace();
+				Logger.error(e);
 			}
 		}
 	}
@@ -229,7 +230,7 @@ public class OptionFlags {
 			ps.println();
 		} catch (FileNotFoundException e) {
 			Log.error("Cannot open " + logData);
-			e.printStackTrace();
+			Logger.error(e);
 		}
 	}
 

src/net/sourceforge/plantuml/ProgressBar.java

@@ -36,35 +36,52 @@
 package net.sourceforge.plantuml;
 
 import java.util.concurrent.atomic.AtomicInteger;
+import java.util.logging.Handler;
+import java.util.logging.Level;
+import java.util.logging.LogRecord;
 
 public class ProgressBar {
 
+	private static final java.util.logging.Logger logger;
+
+	static {
+		logger = java.util.logging.Logger.getLogger("com.plantuml.ProgressBar");
+		logger.setUseParentHandlers(false);
+		logger.addHandler(new StdErrHandler());
+	}
+
 	private static boolean enable;
 	private static String last = null;
 	private static final AtomicInteger total = new AtomicInteger();
 	private static final AtomicInteger done = new AtomicInteger();
 
 	private synchronized static void print(String message) {
-		clear();
+		logger.log(Level.INFO, buildClearMessage() + message);
-		System.err.print(message);
 		last = message;
 	}
 
 	public synchronized static void clear() {
-		if (last != null) {
+		logger.log(Level.INFO, buildClearMessage());
-			for (int i = 0; i < last.length(); i++) {
-				System.err.print('\b');
-			}
-			for (int i = 0; i < last.length(); i++) {
-				System.err.print(' ');
-			}
-			for (int i = 0; i < last.length(); i++) {
-				System.err.print('\b');
-			}
-		}
 		last = null;
 	}
 
+	private static String buildClearMessage() {
+		if (last != null) {
+			StringBuilder sb = new StringBuilder();
+			for (int i = 0; i < last.length(); i++) {
+				sb.append("\b");
+			}
+			for (int i = 0; i < last.length(); i++) {
+				sb.append(" ");
+			}
+			for (int i = 0; i < last.length(); i++) {
+				sb.append("\b");
+			}
+			return sb.toString();
+		}
+		return "";
+	}
+
 	public static void incTotal(int nb) {
 		total.addAndGet(nb);
 		printBar(done.intValue(), total.intValue());
@@ -77,9 +94,7 @@ public class ProgressBar {
 		if (total == 0) {
 			return;
 		}
-		final String message = "[" + getBar(done, total) + "] " + done + "/" + total;
+		print("[" + getBar(done, total) + "] " + done + "/" + total);
-		print(message);
-
 	}
 
 	private static String getBar(int done, int total) {
@@ -101,4 +116,30 @@ public class ProgressBar {
 		enable = value;
 	}
 
+	private static class StdErrHandler extends Handler {
+		public StdErrHandler() {
+		}
+
+		@Override
+		public void publish(LogRecord record) {
+			String message = record.getMessage();
+			System.err.print(message);
+			this.flush();
+		}
+
+		@Override
+		public void flush() {
+			System.err.flush();
+		}
+
+		/**
+		 * Override {@code StreamHandler.close} to do a flush but not to close the output stream.
+		 * That is, we do <b>not</b> close {@code System.err}.
+		 */
+		@Override
+		public void close() {
+			flush();
+		}
+	}
 }
+

src/net/sourceforge/plantuml/Run.java

@@ -58,6 +58,7 @@ import net.sourceforge.plantuml.code.NoPlantumlCompressionException;
 import net.sourceforge.plantuml.code.Transcoder;
 import net.sourceforge.plantuml.code.TranscoderUtil;
 import net.sourceforge.plantuml.ftp.FtpServer;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.picoweb.PicoWebServer;
 import net.sourceforge.plantuml.png.MetadataTag;
 import net.sourceforge.plantuml.preproc.Stdlib;
@@ -403,7 +404,7 @@ public class Run {
 					return;
 				}
 			} catch (IOException e) {
-				e.printStackTrace();
+				Logger.error(e);
 			}
 		}
 	}
@@ -426,9 +427,9 @@ public class Run {
 						try {
 							manageFileInternal(f, option, error);
 						} catch (IOException e) {
-							e.printStackTrace();
+							Logger.error(e);
 						} catch (InterruptedException e) {
-							e.printStackTrace();
+							Logger.error(e);
 						}
 						incDone(error.hasError());
 					}

src/net/sourceforge/plantuml/SignatureUtils.java

@@ -50,6 +50,7 @@ import javax.crypto.SecretKeyFactory;
 import javax.crypto.spec.PBEKeySpec;
 
 import net.sourceforge.plantuml.code.AsciiEncoder;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.security.SFile;
 
 public class SignatureUtils {
@@ -77,10 +78,10 @@ public class SignatureUtils {
 			final byte[] digest = getMD5raw(s);
 			return toString(digest);
 		} catch (NoSuchAlgorithmException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			throw new UnsupportedOperationException(e);
 		} catch (UnsupportedEncodingException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			throw new UnsupportedOperationException(e);
 		}
 	}
@@ -104,10 +105,10 @@ public class SignatureUtils {
 			assert digest.length == 16;
 			return toHexString(digest);
 		} catch (NoSuchAlgorithmException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			throw new UnsupportedOperationException(e);
 		} catch (UnsupportedEncodingException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			throw new UnsupportedOperationException(e);
 		}
 	}
@@ -118,10 +119,10 @@ public class SignatureUtils {
 			assert digest.length == 64;
 			return toHexString(digest);
 		} catch (NoSuchAlgorithmException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			throw new UnsupportedOperationException(e);
 		} catch (UnsupportedEncodingException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			throw new UnsupportedOperationException(e);
 		}
 	}
@@ -160,10 +161,10 @@ public class SignatureUtils {
 			final byte[] digest = msgDigest.digest();
 			return toString(digest);
 		} catch (NoSuchAlgorithmException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			throw new UnsupportedOperationException(e);
 		} catch (UnsupportedEncodingException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			throw new UnsupportedOperationException(e);
 		}
 	}
@@ -194,10 +195,10 @@ public class SignatureUtils {
 			final byte[] digest = msgDigest.digest();
 			return toString(digest);
 		} catch (NoSuchAlgorithmException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			throw new UnsupportedOperationException(e);
 		} catch (UnsupportedEncodingException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			throw new UnsupportedOperationException(e);
 		}
 	}

src/net/sourceforge/plantuml/SkinParam.java

@@ -63,6 +63,7 @@ import net.sourceforge.plantuml.cucadiagram.Stereotype;
 import net.sourceforge.plantuml.cucadiagram.dot.DotSplines;
 import net.sourceforge.plantuml.graphic.HorizontalAlignment;
 import net.sourceforge.plantuml.graphic.color.Colors;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.skin.ActorStyle;
 import net.sourceforge.plantuml.skin.ArrowDirection;
 import net.sourceforge.plantuml.skin.Padder;
@@ -111,7 +112,7 @@ public class SkinParam implements ISkinParam {
 			try {
 				this.styleBuilder = getCurrentStyleBuilderInternal();
 			} catch (IOException e) {
-				e.printStackTrace();
+				Logger.error(e);
 			}
 		}
 		return styleBuilder;
@@ -178,7 +179,7 @@ public class SkinParam implements ISkinParam {
 					this.muteStyle(modifiedStyle);
 
 			} catch (IOException e) {
-				e.printStackTrace();
+				Logger.error(e);
 			}
 		}
 	}

src/net/sourceforge/plantuml/SourceFileReaderAbstract.java

@@ -57,6 +57,7 @@ import net.sourceforge.plantuml.api.ImageDataSimple;
 import net.sourceforge.plantuml.api.ThemeStyle;
 import net.sourceforge.plantuml.core.Diagram;
 import net.sourceforge.plantuml.error.PSystemError;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.preproc.Defines;
 import net.sourceforge.plantuml.preproc.FileWithSuffix;
 import net.sourceforge.plantuml.security.SFile;
@@ -159,7 +160,7 @@ public abstract class SourceFileReaderAbstract implements ISourceFileReader {
 			try {
 				system = blockUml.getDiagram();
 			} catch (Throwable t) {
-				t.printStackTrace();
+				Logger.error(t);
 				if (OptionFlags.getInstance().isSilentlyCompletelyIgnoreErrors() || noerror) {
 					continue;
 				}

src/net/sourceforge/plantuml/Splash.java

@@ -51,6 +51,7 @@ import java.awt.image.BufferedImage;
 import java.net.URL;
 import java.util.concurrent.atomic.AtomicInteger;
 
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.version.PSystemVersion;
 
 public class Splash extends Window implements MouseListener, MouseMotionListener {
@@ -139,7 +140,7 @@ public class Splash extends Window implements MouseListener, MouseMotionListener
 			try {
 				Desktop.getDesktop().browse(new URL("https://plantuml.com").toURI());
 			} catch (Exception e) {
-				e.printStackTrace();
+				Logger.error(e);
 			}
 			return;
 		}

src/net/sourceforge/plantuml/TitledDiagram.java

@@ -261,7 +261,7 @@ public abstract class TitledDiagram extends AbstractPSystem implements Diagram,
 		final AnimationDecoder animationDecoder = new AnimationDecoder(animationData);
 		this.animation = Animation.create(animationDecoder.decode());
 //		} catch (ScriptException e) {
-//			e.printStackTrace();
+//			Logger.error(e);
 //		}
 	}
 

src/net/sourceforge/plantuml/UmlDiagram.java

@@ -65,6 +65,7 @@ import net.sourceforge.plantuml.fun.IconLoader;
 import net.sourceforge.plantuml.graphic.GraphicPosition;
 import net.sourceforge.plantuml.graphic.GraphicStrings;
 import net.sourceforge.plantuml.graphic.UDrawable;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.mjpeg.MJPEGGenerator;
 import net.sourceforge.plantuml.pdf.PdfConverter;
 import net.sourceforge.plantuml.security.SImageIO;
@@ -135,13 +136,13 @@ public abstract class UmlDiagram extends TitledDiagram implements Diagram, Annot
 			this.lastInfo = new Dimension2DDouble(imageData.getWidth(), imageData.getHeight());
 			return imageData;
 		} catch (NoStyleAvailableException e) {
-			// e.printStackTrace();
+			// Logger.error(e);
 			exportDiagramError(os, e, fileFormatOption, null);
 		} catch (UnparsableGraphvizException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			exportDiagramError(os, e.getCause(), fileFormatOption, e.getGraphvizVersion());
 		} catch (Throwable e) {
-			// e.printStackTrace();
+			// Logger.error(e);
 			exportDiagramError(os, e, fileFormatOption, null);
 		}
 		return ImageDataSimple.error();
@@ -170,7 +171,7 @@ public abstract class UmlDiagram extends TitledDiagram implements Diagram, Annot
 				im2 = utils.exportFlashcode(flash, Color.BLACK, Color.WHITE);
 			} catch (Throwable e) {
 				Log.error("Issue in flashcode generation " + e);
-				// e.printStackTrace();
+				// Logger.error(e);
 			}
 			if (im2 != null)
 				GraphvizCrash.addDecodeHint(strings);

src/net/sourceforge/plantuml/acearth/PSystemXearthFactory.java

@@ -47,6 +47,7 @@ import net.sourceforge.plantuml.command.regex.Matcher2;
 import net.sourceforge.plantuml.command.regex.MyPattern;
 import net.sourceforge.plantuml.command.regex.Pattern2;
 import net.sourceforge.plantuml.core.UmlSource;
+import net.sourceforge.plantuml.log.Logger;
 
 public class PSystemXearthFactory extends PSystemBasicFactory<PSystemXearth> {
 
@@ -100,7 +101,7 @@ public class PSystemXearthFactory extends PSystemBasicFactory<PSystemXearth> {
 				return system;
 			}
 		} catch (Exception e) {
-			e.printStackTrace();
+			Logger.error(e);
 			return null;
 		}
 		return null;

src/net/sourceforge/plantuml/ant/CheckZipTask.java

@@ -44,6 +44,8 @@ import java.util.List;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipInputStream;
 
+import net.sourceforge.plantuml.log.Logger;
+
 import org.apache.tools.ant.BuildException;
 import org.apache.tools.ant.Task;
 import org.apache.tools.ant.types.FileList;
@@ -84,7 +86,7 @@ public class CheckZipTask extends Task {
 				manageFileList(fileList);
 			}
 		} catch (IOException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			throw new BuildException(e.toString());
 		}
 	}

src/net/sourceforge/plantuml/ant/PlantUmlTask.java

@@ -46,6 +46,8 @@ import java.util.concurrent.Executors;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicInteger;
 
+import net.sourceforge.plantuml.log.Logger;
+
 import org.apache.tools.ant.BuildException;
 import org.apache.tools.ant.DirectoryScanner;
 import org.apache.tools.ant.Task;
@@ -130,10 +132,10 @@ public class PlantUmlTask extends Task {
 			}
 			this.log("Nb images generated: " + nbFiles.get());
 		} catch (IOException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			throw new BuildException(e.toString());
 		} catch (InterruptedException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			throw new BuildException(e.toString());
 		}
 

src/net/sourceforge/plantuml/api/NumberAnalyzed.java

@@ -35,6 +35,8 @@ import java.util.prefs.Preferences;
 
 import net.sourceforge.plantuml.Log;
 import net.sourceforge.plantuml.annotation.HaxeIgnored;
+import net.sourceforge.plantuml.log.Logger;
+
 @HaxeIgnored
 public class NumberAnalyzed implements INumberAnalyzed {
 
@@ -121,7 +123,7 @@ public class NumberAnalyzed implements INumberAnalyzed {
 					Long.parseLong(st.nextToken(), 36), Long.parseLong(st.nextToken(), 36), Long.parseLong(
 							st.nextToken(), 36), Long.parseLong(st.nextToken(), 36));
 		} catch (Exception e) {
-			e.printStackTrace();
+			Logger.error(e);
 			Log.info("Error reading " + value);
 			return null;
 		}

src/net/sourceforge/plantuml/api/NumberAnalyzed2.java

@@ -34,6 +34,7 @@ import java.util.prefs.Preferences;
 
 import net.sourceforge.plantuml.Log;
 import net.sourceforge.plantuml.annotation.HaxeIgnored;
+import net.sourceforge.plantuml.log.Logger;
 
 @HaxeIgnored
 public class NumberAnalyzed2 implements INumberAnalyzed {
@@ -95,7 +96,7 @@ public class NumberAnalyzed2 implements INumberAnalyzed {
 					Long.parseLong(st.nextToken(), 36), Long.parseLong(st.nextToken(), 36), Long.parseLong(
 							st.nextToken(), 36), Long.parseLong(st.nextToken(), 36));
 		} catch (Exception e) {
-			e.printStackTrace();
+			Logger.error(e);
 			Log.info("Error reading " + value);
 			return null;
 		}

src/net/sourceforge/plantuml/api/NumberAnalyzedDated.java

@@ -34,6 +34,7 @@ import java.util.prefs.Preferences;
 
 import net.sourceforge.plantuml.Log;
 import net.sourceforge.plantuml.annotation.HaxeIgnored;
+import net.sourceforge.plantuml.log.Logger;
 
 @HaxeIgnored
 public class NumberAnalyzedDated extends NumberAnalyzed {
@@ -104,7 +105,7 @@ public class NumberAnalyzedDated extends NumberAnalyzed {
 					Long.parseLong(st.nextToken(), 36), Long.parseLong(st.nextToken(), 36), Long.parseLong(
 							st.nextToken(), 36), st.nextToken());
 		} catch (Exception e) {
-			e.printStackTrace();
+			Logger.error(e);
 			Log.info("Error reading " + value);
 			return null;
 		}

src/net/sourceforge/plantuml/api/TimeoutExecutor.java

@@ -35,6 +35,8 @@
  */
 package net.sourceforge.plantuml.api;
 
+import net.sourceforge.plantuml.log.Logger;
+
 import java.util.concurrent.atomic.AtomicBoolean;
 
 public final class TimeoutExecutor {
@@ -53,7 +55,7 @@ public final class TimeoutExecutor {
 			mainThread.join(ms);
 		} catch (InterruptedException e) {
 			System.err.println("TimeoutExecutorA " + e);
-			e.printStackTrace();
+			Logger.error(e);
 			return false;
 		} finally {
 			done = mainThread.done.get();
@@ -80,7 +82,7 @@ public final class TimeoutExecutor {
 				done.set(true);
 			} catch (InterruptedException e) {
 				System.err.println("TimeoutExecutorB " + e);
-				e.printStackTrace();
+				Logger.error(e);
 			}
 		}
 

src/net/sourceforge/plantuml/argon2/blake2/Blake2b.java

@@ -26,6 +26,7 @@
 package net.sourceforge.plantuml.argon2.blake2;
 
 
+import net.sourceforge.plantuml.log.Logger;
 import static net.sourceforge.plantuml.argon2.blake2.Blake2b.Engine.Assert.*;
 import static net.sourceforge.plantuml.argon2.blake2.Blake2b.Engine.LittleEndian.*;
 
@@ -896,7 +897,7 @@ public interface Blake2b {
 			public final static String exclusiveLowerBound = "'%s' %d is <= %d";
 			public final static String inclusiveLowerBound = "'%s' %d is < %d";
 			static <T extends Number> String assertFail(final String name, final T v, final String err, final T spec) {
-				new Exception().printStackTrace();
+				Logger.error(new Exception());
 				return String.format(err, name, v, spec);
 			}
 		}

src/net/sourceforge/plantuml/code/CompressionBrotli.java

@@ -41,6 +41,7 @@ import java.io.IOException;
 
 import net.sourceforge.plantuml.FileUtils;
 import net.sourceforge.plantuml.brotli.BrotliInputStream;
+import net.sourceforge.plantuml.log.Logger;
 
 public class CompressionBrotli implements Compression {
 
@@ -56,7 +57,7 @@ public class CompressionBrotli implements Compression {
 			FileUtils.copyToStream(brotli, result);
 			return ByteArray.from(result.toByteArray());
 		} catch (IOException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			throw new NoPlantumlCompressionException(e);
 		}
 	}

src/net/sourceforge/plantuml/code/CompressionZlibAttic.java

@@ -91,7 +91,7 @@ public class CompressionZlibAttic implements Compression {
 
 			return ByteArray.from(result);
 		} catch (IOException e) {
-			// e.printStackTrace();
+			// Logger.error(e);
 			throw new NoPlantumlCompressionException(e);
 		}
 
@@ -115,7 +115,7 @@ public class CompressionZlibAttic implements Compression {
 			final byte[] result = copyArray(tmp, resultLength);
 			return result;
 		} catch (DataFormatException e) {
-			// e.printStackTrace();
+			// Logger.error(e);
 			throw new IOException(e.toString());
 		}
 	}

src/net/sourceforge/plantuml/code/Upf9Encoder.java

@@ -35,6 +35,8 @@
  */
 package net.sourceforge.plantuml.code;
 
+import net.sourceforge.plantuml.log.Logger;
+
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
@@ -56,7 +58,7 @@ public class Upf9Encoder {
 			if (c == Upf9Decoder.decodeChar(new ByteArrayInputStream(result)))
 				return true;
 		} catch (IOException e) {
-			e.printStackTrace();
+			Logger.error(e);
 		}
 		return false;
 	}

src/net/sourceforge/plantuml/command/CommandSkinParam.java

@@ -64,7 +64,7 @@ public class CommandSkinParam extends SingleLineCommand2<TitledDiagram> {
 			diagram.setParam(arg.get("NAME", 0), arg.get("VALUE", 0));
 			return CommandExecutionResult.ok();
 		} catch (NoStyleAvailableException e) {
-			// e.printStackTrace();
+			// Logger.error(e);
 			return CommandExecutionResult.error("General failure: no style available.");
 		}
 

src/net/sourceforge/plantuml/command/ProtectedCommand.java

@@ -39,6 +39,7 @@ import java.util.Objects;
 
 import net.sourceforge.plantuml.Log;
 import net.sourceforge.plantuml.core.Diagram;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.version.Version;
 
 public class ProtectedCommand<S extends Diagram> implements Command<S> {
@@ -58,12 +59,11 @@ public class ProtectedCommand<S extends Diagram> implements Command<S> {
 			// }
 			return result;
 		} catch (Throwable t) {
-			Log.error("Error " + t);
+			Logger.error("Error ", t);
-			t.printStackTrace();
 			String msg = "You should send a mail to plantuml@gmail.com or post to http://plantuml.com/qa with this log (V"
 					+ Version.versionString() + ")";
-			Log.error(msg);
+			Logger.error(msg);
-			msg += " " + t.toString();
+			msg += " " + t;
 			return CommandExecutionResult.error(msg, t);
 		}
 	}

src/net/sourceforge/plantuml/command/SkinLoader.java

@@ -106,7 +106,7 @@ public class SkinLoader {
 			}
 			return CommandExecutionResult.ok();
 		} catch (NoStyleAvailableException e) {
-			// e.printStackTrace();
+			// Logger.error(e);
 			return CommandExecutionResult.error("General failure: no style available.");
 		}
 

src/net/sourceforge/plantuml/creole/atom/AtomImg.java

@@ -54,6 +54,7 @@ import net.sourceforge.plantuml.graphic.FontConfiguration;
 import net.sourceforge.plantuml.graphic.ImgValign;
 import net.sourceforge.plantuml.graphic.StringBounder;
 import net.sourceforge.plantuml.graphic.TileImageSvg;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.security.SImageIO;
 import net.sourceforge.plantuml.security.SFile;
 import net.sourceforge.plantuml.security.SURL;
@@ -148,7 +149,7 @@ public class AtomImg extends AbstractAtom implements Atom {
 			}
 			return new AtomImg(f.readRasterImageFromFile(), scale, url, src);
 		} catch (IOException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			if (SecurityUtils.getSecurityProfile() == SecurityProfile.UNSECURE)
 				return AtomTextUtils.createLegacy("ERROR " + e.toString(), fc);
 

src/net/sourceforge/plantuml/cucadiagram/GroupPrinter.java

@@ -38,6 +38,7 @@ package net.sourceforge.plantuml.cucadiagram;
 import java.io.IOException;
 import java.io.PrintWriter;
 
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.security.SFile;
 
 public class GroupPrinter {
@@ -90,7 +91,7 @@ public class GroupPrinter {
 			new GroupPrinter(pw).printGroup(rootGroup);
 			pw.println("</html>");
 		} catch (IOException e) {
-			e.printStackTrace();
+			Logger.error(e);
 		}
 	}
 

src/net/sourceforge/plantuml/cucadiagram/dot/AbstractGraphviz.java

@@ -45,6 +45,7 @@ import net.sourceforge.plantuml.ISkinParam;
 import net.sourceforge.plantuml.Log;
 import net.sourceforge.plantuml.OptionFlags;
 import net.sourceforge.plantuml.StringUtils;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.security.SFile;
 
 abstract class AbstractGraphviz implements Graphviz {
@@ -116,7 +117,7 @@ abstract class AbstractGraphviz implements Graphviz {
 			// }
 			Log.info("Ending process ok");
 		} catch (Throwable e) {
-			e.printStackTrace();
+			Logger.error(e);
 			Log.error("Error: " + e);
 			Log.error("The command was " + cmd);
 			Log.error("");

src/net/sourceforge/plantuml/cucadiagram/dot/DebugTrace.java

@@ -51,7 +51,7 @@ public class DebugTrace {
 			try {
 				pw = out.createPrintWriter();
 			} catch (FileNotFoundException e) {
-
+				// ignore
 			}
 		}
 		return pw;

src/net/sourceforge/plantuml/cucadiagram/dot/GraphvizUtils.java

@@ -45,6 +45,7 @@ import java.util.regex.Pattern;
 import net.sourceforge.plantuml.ISkinParam;
 import net.sourceforge.plantuml.Log;
 import net.sourceforge.plantuml.StringUtils;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.security.SFile;
 import net.sourceforge.plantuml.security.SecurityProfile;
 import net.sourceforge.plantuml.security.SecurityUtils;
@@ -186,7 +187,7 @@ public class GraphvizUtils {
 		try {
 			return create(null, "png").graphviz244onWindows();
 		} catch (Exception e) {
-			e.printStackTrace();
+			Logger.error(e);
 			return false;
 		}
 	}
@@ -227,8 +228,8 @@ public class GraphvizUtils {
 					result.add(red + err);
 
 			} catch (Exception e) {
-				result.add(red + e.toString());
+				result.add(red + e);
-				e.printStackTrace();
+				Logger.error(e);
 				error = -1;
 			}
 			return error;
@@ -268,8 +269,8 @@ public class GraphvizUtils {
 					}
 				}
 			} catch (Exception e) {
-				result.add(red + e.toString());
+				result.add(red + e);
-				e.printStackTrace();
+				Logger.error(e);
 				error = -5;
 			}
 		} else {

src/net/sourceforge/plantuml/cucadiagram/dot/GraphvizWindowsOld.java

@@ -43,6 +43,7 @@ import java.util.List;
 
 import net.sourceforge.plantuml.ISkinParam;
 import net.sourceforge.plantuml.StringUtils;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.windowsdot.WindowsDotArchive;
 
 class GraphvizWindowsOld extends AbstractGraphviz {
@@ -66,7 +67,7 @@ class GraphvizWindowsOld extends AbstractGraphviz {
 		try {
 			return GraphvizUtils.getDotVersion() == 244;
 		} catch (Exception e) {
-			e.printStackTrace();
+			Logger.error(e);
 			return false;
 		}
 	}

src/net/sourceforge/plantuml/cucadiagram/dot/ProcessRunner.java

@@ -44,6 +44,7 @@ import java.util.concurrent.locks.ReentrantLock;
 import net.sourceforge.plantuml.OptionFlags;
 import net.sourceforge.plantuml.api.MyRunnable;
 import net.sourceforge.plantuml.api.TimeoutExecutor;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.security.SFile;
 
 public class ProcessRunner {
@@ -162,14 +163,14 @@ public class ProcessRunner {
 			try {
 				process = Runtime.getRuntime().exec(cmd, null, dir == null ? null : dir.conv());
 			} catch (IOException e) {
-				e.printStackTrace();
+				Logger.error(e);
 				changeState.lock();
 				try {
 					state = ProcessState.IO_EXCEPTION1(e);
 				} finally {
 					changeState.unlock();
 				}
-				e.printStackTrace();
+				Logger.error(e);
 				return;
 			}
 			errorStream = new ThreadStream(process.getErrorStream(), null);
@@ -191,7 +192,7 @@ public class ProcessRunner {
 					} finally {
 						changeState.unlock();
 					}
-					e.printStackTrace();
+					Logger.error(e);
 				}
 			}
 		}
@@ -248,9 +249,9 @@ public class ProcessRunner {
 				}
 			} catch (Throwable e) {
 				System.err.println("ProcessRunnerA " + e);
-				e.printStackTrace();
+				Logger.error(e);
 				sb.append('\n');
-				sb.append(e.toString());
+				sb.append(e);
 			}
 		}
 	}
@@ -269,7 +270,7 @@ public class ProcessRunner {
 				is.close();
 			}
 		} catch (IOException e) {
-			e.printStackTrace();
+			Logger.error(e);
 		}
 	}
 
@@ -279,7 +280,7 @@ public class ProcessRunner {
 				os.close();
 			}
 		} catch (IOException e) {
-			e.printStackTrace();
+			Logger.error(e);
 		}
 	}
 

src/net/sourceforge/plantuml/dedication/DedicationCrypted.java

@@ -41,6 +41,7 @@ import java.awt.image.BufferedImage;
 import java.io.ByteArrayInputStream;
 import java.math.BigInteger;
 
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.utils.MTRandom;
 
 public class DedicationCrypted implements Dedication {
@@ -113,7 +114,7 @@ public class DedicationCrypted implements Dedication {
 			this.solution = line;
 			return img;
 		} catch (Throwable t) {
-			t.printStackTrace();
+			Logger.error(t);
 			return null;
 		}
 

src/net/sourceforge/plantuml/dedication/DedicationSimple.java

@@ -35,6 +35,8 @@
  */
 package net.sourceforge.plantuml.dedication;
 
+import net.sourceforge.plantuml.log.Logger;
+
 import java.awt.image.BufferedImage;
 import java.io.ByteArrayInputStream;
 
@@ -61,7 +63,7 @@ public class DedicationSimple implements Dedication {
 			current = decoded.toByteArray(512);
 			return PSystemDedication.getBufferedImage(new ByteArrayInputStream(current));
 		} catch (Throwable t) {
-			t.printStackTrace();
+			Logger.error(t);
 			return null;
 		}
 	}

src/net/sourceforge/plantuml/dedication/Dedications.java

@@ -44,6 +44,7 @@ import java.util.ArrayList;
 import java.util.List;
 
 import net.sourceforge.plantuml.FileUtils;
+import net.sourceforge.plantuml.log.Logger;
 
 public class Dedications {
 
@@ -64,7 +65,7 @@ public class Dedications {
 			all.add(secret(1, "ae8a7cf3997ccd6418866fc59e596502e1bd1c0265bba2fc380ad7f51c76518f", new BigInteger(
 					"987988542836850639056829173787067531749177506648884857100630852970876999799588072360773169026225182488073794585127241896588994816566037813451743416913613428321215803586563629080034406083114565732322220091545330060636171674602040157")));
 		} catch (Throwable t) {
-			t.printStackTrace();
+			Logger.error(t);
 		}
 	}
 

src/net/sourceforge/plantuml/dedication/PSystemDedication.java

@@ -47,6 +47,7 @@ import net.sourceforge.plantuml.PlainDiagram;
 import net.sourceforge.plantuml.core.DiagramDescription;
 import net.sourceforge.plantuml.core.UmlSource;
 import net.sourceforge.plantuml.graphic.UDrawable;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.security.SImageIO;
 import net.sourceforge.plantuml.ugraphic.AffineTransformType;
 import net.sourceforge.plantuml.ugraphic.PixelImage;
@@ -87,7 +88,7 @@ public class PSystemDedication extends PlainDiagram {
 			// final VP8Frame frame = vp8Decoder.getFrame();
 			// return frame.getBufferedImage();
 		} catch (Exception e) {
-			e.printStackTrace();
+			Logger.error(e);
 			return null;
 		}
 	}

src/net/sourceforge/plantuml/ditaa/PSystemDitaa.java

@@ -53,6 +53,7 @@ import net.sourceforge.plantuml.api.ImageDataSimple;
 import net.sourceforge.plantuml.core.DiagramDescription;
 import net.sourceforge.plantuml.core.ImageData;
 import net.sourceforge.plantuml.core.UmlSource;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.security.SImageIO;
 import net.sourceforge.plantuml.svek.GraphvizCrash;
 
@@ -85,7 +86,7 @@ public class PSystemDitaa extends AbstractPSystem {
 			this.processingOptions.getClass().getMethod("setAllCornersAreRound", boolean.class)
 					.invoke(this.processingOptions, allCornersAreRound);
 		} catch (Exception e) {
-			e.printStackTrace();
+			Logger.error(e);
 			this.processingOptions = null;
 		}
 		this.transparentBackground = transparentBackground;

src/net/sourceforge/plantuml/donors/PSystemDonors.java

@@ -57,6 +57,7 @@ import net.sourceforge.plantuml.graphic.GraphicStrings;
 import net.sourceforge.plantuml.graphic.StringBounder;
 import net.sourceforge.plantuml.graphic.TextBlock;
 import net.sourceforge.plantuml.graphic.UDrawable;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.svek.TextBlockBackcolored;
 import net.sourceforge.plantuml.ugraphic.AffineTransformType;
 import net.sourceforge.plantuml.ugraphic.PixelImage;
@@ -153,7 +154,7 @@ public class PSystemDonors extends PlainDiagram {
 				lines.add(st.nextToken());
 			}
 		} catch (NoPlantumlCompressionException e) {
-			e.printStackTrace();
+			Logger.error(e);
 		}
 		return lines;
 	}

src/net/sourceforge/plantuml/eggs/PSystemAppleTwoFactory.java

@@ -41,6 +41,7 @@ import net.sourceforge.plantuml.AbstractPSystem;
 import net.sourceforge.plantuml.Log;
 import net.sourceforge.plantuml.command.PSystemSingleLineFactory;
 import net.sourceforge.plantuml.core.UmlSource;
+import net.sourceforge.plantuml.log.Logger;
 
 public class PSystemAppleTwoFactory extends PSystemSingleLineFactory {
 
@@ -53,7 +54,7 @@ public class PSystemAppleTwoFactory extends PSystemSingleLineFactory {
 				return new PSystemAppleTwo(source);
 			} catch (IOException e) {
 				Log.error("Error " + e);
-				e.printStackTrace();
+				Logger.error(e);
 			}
 		}
 		return null;

src/net/sourceforge/plantuml/eggs/PSystemRIPFactory.java

@@ -41,6 +41,7 @@ import net.sourceforge.plantuml.AbstractPSystem;
 import net.sourceforge.plantuml.Log;
 import net.sourceforge.plantuml.command.PSystemSingleLineFactory;
 import net.sourceforge.plantuml.core.UmlSource;
+import net.sourceforge.plantuml.log.Logger;
 
 public class PSystemRIPFactory extends PSystemSingleLineFactory {
 
@@ -51,7 +52,7 @@ public class PSystemRIPFactory extends PSystemSingleLineFactory {
 				return new PSystemRIP(source);
 			} catch (IOException e) {
 				Log.error("Error " + e);
-				e.printStackTrace();
+				Logger.error(e);
 			}
 		}
 		return null;

src/net/sourceforge/plantuml/elk/CucaDiagramFileMakerElk.java

@@ -111,6 +111,7 @@ import net.sourceforge.plantuml.graphic.StringBounder;
 import net.sourceforge.plantuml.graphic.TextBlock;
 import net.sourceforge.plantuml.graphic.TextBlockUtils;
 import net.sourceforge.plantuml.graphic.USymbolFolder;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.style.PName;
 import net.sourceforge.plantuml.style.SName;
 import net.sourceforge.plantuml.style.Style;
@@ -521,7 +522,7 @@ public class CucaDiagramFileMakerElk implements CucaDiagramFileMaker {
 	}
 
 	static private List<String> getFailureText3(Throwable exception) {
-		exception.printStackTrace();
+		Logger.error(exception);
 		final List<String> strings = new ArrayList<>();
 		strings.add("An error has occured : " + exception);
 		final String quote = StringUtils.rot(QuoteUtils.getSomeQuote());

src/net/sourceforge/plantuml/elk/proxy/Reflect.java

@@ -35,6 +35,8 @@
  */
 package net.sourceforge.plantuml.elk.proxy;
 
+import net.sourceforge.plantuml.log.Logger;
+
 import java.lang.reflect.Constructor;
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
@@ -48,7 +50,7 @@ public class Reflect {
 		try {
 			return Class.forName(className);
 		} catch (Throwable t) {
-			t.printStackTrace();
+			Logger.error(t);
 			throw new IllegalArgumentException(t);
 		}
 	}
@@ -63,7 +65,7 @@ public class Reflect {
 			}
 			throw new UnsupportedOperationException(name);
 		} catch (Throwable t) {
-			t.printStackTrace();
+			Logger.error(t);
 			throw new IllegalArgumentException(t);
 		}
 	}
@@ -74,7 +76,7 @@ public class Reflect {
 			final Field field = cl.getField(fieldname);
 			return field.get(null);
 		} catch (Throwable t) {
-			t.printStackTrace();
+			Logger.error(t);
 			throw new IllegalArgumentException(t);
 		}
 	}
@@ -84,7 +86,7 @@ public class Reflect {
 			final Class<?> cl = Class.forName(className);
 			return cl.newInstance();
 		} catch (Throwable t) {
-			t.printStackTrace();
+			Logger.error(t);
 			throw new IllegalArgumentException(t);
 		}
 	}
@@ -95,7 +97,7 @@ public class Reflect {
 			final Constructor<?> m = cl.getConstructor(arg1.getClass());
 			return m.newInstance(arg1);
 		} catch (Throwable t) {
-			t.printStackTrace();
+			Logger.error(t);
 			throw new IllegalArgumentException(t);
 		}
 	}
@@ -106,7 +108,7 @@ public class Reflect {
 			final Constructor<?> m = cl.getConstructor(Double.TYPE, Double.TYPE, Double.TYPE, Double.TYPE);
 			return m.newInstance(arg1, arg2, arg3, arg4);
 		} catch (Throwable t) {
-			t.printStackTrace();
+			Logger.error(t);
 			throw new IllegalArgumentException(t);
 		}
 	}
@@ -117,7 +119,7 @@ public class Reflect {
 			final Field f = cl.getField(fieldName);
 			return f.get(null);
 		} catch (Throwable t) {
-			t.printStackTrace();
+			Logger.error(t);
 			throw new IllegalArgumentException(t);
 		}
 	}
@@ -128,7 +130,7 @@ public class Reflect {
 			final Method m = cl.getMethod(method);
 			return m.invoke(null);
 		} catch (Throwable t) {
-			t.printStackTrace();
+			Logger.error(t);
 			throw new IllegalArgumentException(t);
 		}
 	}
@@ -139,7 +141,7 @@ public class Reflect {
 			final Method m = cl.getMethod(method, arg1.getClass());
 			return m.invoke(null, arg1);
 		} catch (Throwable t) {
-			t.printStackTrace();
+			Logger.error(t);
 			throw new IllegalArgumentException(t);
 		}
 	}
@@ -150,7 +152,7 @@ public class Reflect {
 			final Method m = cl.getMethod(method, arg1.getClass(), arg2.getClass());
 			return m.invoke(null, arg1, arg2);
 		} catch (Throwable t) {
-			t.printStackTrace();
+			Logger.error(t);
 			throw new IllegalArgumentException(t);
 		}
 	}
@@ -161,7 +163,7 @@ public class Reflect {
 			final Method m = getStaticMethod(cl, method, 1);
 			return m.invoke(null, arg1);
 		} catch (Throwable t) {
-			t.printStackTrace();
+			Logger.error(t);
 			throw new IllegalArgumentException(t);
 		}
 	}
@@ -172,7 +174,7 @@ public class Reflect {
 			final Method m = getStaticMethod(cl, method, 2);
 			return m.invoke(null, arg1, arg2);
 		} catch (Throwable t) {
-			t.printStackTrace();
+			Logger.error(t);
 			throw new IllegalArgumentException(t);
 		}
 	}
@@ -191,7 +193,7 @@ public class Reflect {
 			final Method m = instance.getClass().getMethod(method);
 			return m.invoke(instance);
 		} catch (Throwable t) {
-			t.printStackTrace();
+			Logger.error(t);
 			throw new IllegalArgumentException(t);
 		}
 	}
@@ -201,7 +203,7 @@ public class Reflect {
 			final Method m = instance.getClass().getMethod(method, arg1.getClass());
 			return m.invoke(instance, arg1);
 		} catch (Throwable t) {
-			t.printStackTrace();
+			Logger.error(t);
 			throw new IllegalArgumentException(t);
 		}
 	}
@@ -211,7 +213,7 @@ public class Reflect {
 			final Method m = instance.getClass().getMethod(method, arg1.getClass(), arg2.getClass());
 			return m.invoke(instance, arg1, arg2);
 		} catch (Throwable t) {
-			t.printStackTrace();
+			Logger.error(t);
 			throw new IllegalArgumentException(t);
 		}
 	}
@@ -221,7 +223,7 @@ public class Reflect {
 			final Method m = getMethod(instance, method, 2);
 			return m.invoke(instance, arg1, arg2);
 		} catch (Throwable t) {
-			t.printStackTrace();
+			Logger.error(t);
 			throw new IllegalArgumentException(t);
 		}
 	}

src/net/sourceforge/plantuml/emoji/Emoji.java

@@ -12,6 +12,7 @@ import java.util.Map;
 import java.util.TreeMap;
 
 import net.sourceforge.plantuml.emoji.data.Dummy;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.ugraphic.UGraphic;
 import net.sourceforge.plantuml.ugraphic.color.HColor;
 
@@ -29,7 +30,7 @@ public class Emoji {
 				new Emoji(s);
 			}
 		} catch (IOException e) {
-			e.printStackTrace();
+			Logger.error(e);
 		}
 	}
 
@@ -87,7 +88,7 @@ public class Emoji {
 		try {
 			loadIfNeed();
 		} catch (IOException e) {
-			e.printStackTrace();
+			Logger.error(e);
 		}
 		nano.drawU(ug, scale, colorForMonochrome);
 	}

src/net/sourceforge/plantuml/emoji/SpriteSvgNanoParser.java

@@ -45,6 +45,7 @@ import net.sourceforge.plantuml.awt.geom.Dimension2D;
 import net.sourceforge.plantuml.graphic.AbstractTextBlock;
 import net.sourceforge.plantuml.graphic.StringBounder;
 import net.sourceforge.plantuml.graphic.TextBlock;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.security.SImageIO;
 import net.sourceforge.plantuml.sprite.Sprite;
 import net.sourceforge.plantuml.ugraphic.AffineTransformType;
@@ -95,7 +96,7 @@ public class SpriteSvgNanoParser implements Sprite {
 		try {
 			return new SpriteSvgNanoParser(SImageIO.read(is));
 		} catch (IOException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			return null;
 		}
 

src/net/sourceforge/plantuml/ftp/FtpLoop.java

@@ -54,6 +54,7 @@ import java.util.StringTokenizer;
 import net.sourceforge.plantuml.FileFormat;
 import net.sourceforge.plantuml.FileUtils;
 import net.sourceforge.plantuml.StringUtils;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.security.SecurityUtils;
 
 class FtpLoop implements Runnable {
@@ -327,7 +328,7 @@ class FtpLoop implements Runnable {
 		try {
 			runInternal();
 		} catch (Throwable t) {
-			t.printStackTrace();
+			Logger.error(t);
 		}
 
 	}

src/net/sourceforge/plantuml/ftp/FtpServer.java

@@ -50,6 +50,7 @@ import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 
 import net.sourceforge.plantuml.FileFormat;
+import net.sourceforge.plantuml.log.Logger;
 
 public class FtpServer {
 
@@ -114,7 +115,7 @@ public class FtpServer {
 				try {
 					connexion.processImage(name);
 				} catch (IOException e) {
-					e.printStackTrace();
+					Logger.error(e);
 				}
 			}
 		});

src/net/sourceforge/plantuml/fun/IconLoader.java

@@ -43,6 +43,7 @@ import java.util.List;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.security.SImageIO;
 
 public class IconLoader {
@@ -93,7 +94,7 @@ public class IconLoader {
 			is.close();
 			return image;
 		} catch (IOException e) {
-			e.printStackTrace();
+			Logger.error(e);
 		}
 		return null;
 	}

src/net/sourceforge/plantuml/graphic/Img.java

@@ -44,6 +44,7 @@ import net.sourceforge.plantuml.StringUtils;
 import net.sourceforge.plantuml.command.regex.Matcher2;
 import net.sourceforge.plantuml.command.regex.MyPattern;
 import net.sourceforge.plantuml.command.regex.Pattern2;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.security.SFile;
 import net.sourceforge.plantuml.security.SURL;
 
@@ -123,8 +124,8 @@ public class Img implements HtmlCommand {
 
 			return new Img(new TileImage(f.readRasterImageFromFile(), valign, vspace));
 		} catch (IOException e) {
-			e.printStackTrace();
+			Logger.error(e);
-			return new Text("ERROR " + e.toString());
+			return new Text("ERROR " + e);
 		}
 	}
 

src/net/sourceforge/plantuml/graphic/UnusedSpace.java

@@ -139,7 +139,7 @@ public class UnusedSpace {
 		// ImageIO.write(im, "png", SecurityUtils.File("c:/img" + cpt + ".png"));
 		// cpt++;
 		// } catch (IOException e) {
-		// e.printStackTrace();
+		// Logger.error(e);
 		// }
 
 	}

src/net/sourceforge/plantuml/hcl/HclDiagramFactory.java

@@ -49,6 +49,7 @@ import net.sourceforge.plantuml.core.UmlSource;
 import net.sourceforge.plantuml.json.JsonValue;
 import net.sourceforge.plantuml.jsondiagram.JsonDiagram;
 import net.sourceforge.plantuml.jsondiagram.StyleExtractor;
+import net.sourceforge.plantuml.log.Logger;
 
 public class HclDiagramFactory extends PSystemAbstractFactory {
 
@@ -76,7 +77,7 @@ public class HclDiagramFactory extends PSystemAbstractFactory {
 			HclParser parser = new HclParser(list);
 			data = parser.parseMe();
 		} catch (Exception e) {
-			e.printStackTrace();
+			Logger.error(e);
 		}
 		final JsonDiagram result = new JsonDiagram(style, source, UmlDiagramType.HCL, data, highlighted);
 //		if (styleExtractor != null) {

src/net/sourceforge/plantuml/help/CommandHelpTheme.java

@@ -45,6 +45,7 @@ import net.sourceforge.plantuml.command.regex.IRegex;
 import net.sourceforge.plantuml.command.regex.RegexConcat;
 import net.sourceforge.plantuml.command.regex.RegexLeaf;
 import net.sourceforge.plantuml.command.regex.RegexResult;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.theme.ThemeUtils;
 
 public class CommandHelpTheme extends SingleLineCommand2<Help> {
@@ -76,7 +77,7 @@ public class CommandHelpTheme extends SingleLineCommand2<Help> {
 		} catch (IOException e) {
 			final String message = "Unexpected error listing themes: " + e.getMessage();
 			Log.error(message);
-			e.printStackTrace();
+			Logger.error(e);
 			return CommandExecutionResult.error(message);
 		}
 

src/net/sourceforge/plantuml/jcckit/PSystemJcckitFactory.java

@@ -49,6 +49,7 @@ import net.sourceforge.plantuml.command.regex.MyPattern;
 import net.sourceforge.plantuml.command.regex.Pattern2;
 import net.sourceforge.plantuml.core.DiagramType;
 import net.sourceforge.plantuml.core.UmlSource;
+import net.sourceforge.plantuml.log.Logger;
 
 public class PSystemJcckitFactory extends PSystemBasicFactory<PSystemJcckit> {
 
@@ -99,7 +100,7 @@ public class PSystemJcckitFactory extends PSystemBasicFactory<PSystemJcckit> {
 			// p.load(new ByteArrayInputStream(data.toString().getBytes("ISO-8859-1")));
 		} catch (IOException e) {
 			Log.error("Error " + e);
-			e.printStackTrace();
+			Logger.error(e);
 			return null;
 		}
 		return new PSystemJcckit(source, p, width, height);

src/net/sourceforge/plantuml/log/Logger.java

@@ -0,0 +1,57 @@
+package net.sourceforge.plantuml.log;
+
+import java.io.PrintWriter;
+import java.io.StringWriter;
+import java.util.logging.ConsoleHandler;
+import java.util.logging.Formatter;
+import java.util.logging.Level;
+import java.util.logging.LogRecord;
+
+public class Logger {
+
+	private static final java.util.logging.Logger logger;
+
+	static {
+		logger = java.util.logging.Logger.getLogger("com.plantuml");
+		logger.setUseParentHandlers(false);
+		ConsoleHandler handler = new ConsoleHandler();
+		handler.setFormatter(new Formatter() {
+			@Override
+			public synchronized String format(LogRecord lr) {
+				String throwable = "";
+				if (lr.getThrown() != null) {
+					StringWriter sw = new StringWriter();
+					PrintWriter pw = new PrintWriter(sw);
+					pw.println();
+					lr.getThrown().printStackTrace(pw);
+					pw.close();
+					throwable = sw.toString().trim();
+				}
+				String message = lr.getMessage();
+				StringBuilder sb = new StringBuilder();
+				if (message.trim().length() > 0) {
+					sb.append(message);
+					sb.append(System.lineSeparator());
+				}
+				if (throwable.length() > 0) {
+					sb.append(throwable);
+					sb.append(System.lineSeparator());
+				}
+				return sb.toString();
+			}
+		});
+		logger.addHandler(handler);
+	}
+
+	public static void error(Throwable thrown) {
+		logger.log(Level.SEVERE, "", thrown);
+	}
+
+	public static void error(String msg, Throwable thrown) {
+		logger.log(Level.SEVERE, msg, thrown);
+	}
+
+	public static void error(String msg) {
+		logger.log(Level.SEVERE, msg);
+	}
+}

src/net/sourceforge/plantuml/math/ConverterSvg.java

@@ -47,6 +47,8 @@ import java.lang.reflect.Method;
 
 import javax.swing.Icon;
 
+import net.sourceforge.plantuml.log.Logger;
+
 import org.w3c.dom.DOMImplementation;
 import org.w3c.dom.Document;
 
@@ -73,7 +75,7 @@ public class ConverterSvg {
 					Class.forName("org.scilab.forge.jlatexmath.greek.GreekRegistration").newInstance());
 
 		} catch (Exception e) {
-			e.printStackTrace();
+			Logger.error(e);
 		}
 
 	}

src/net/sourceforge/plantuml/math/PSystemLatex.java

@@ -45,6 +45,7 @@ import net.sourceforge.plantuml.StringUtils;
 import net.sourceforge.plantuml.core.DiagramDescription;
 import net.sourceforge.plantuml.core.ImageData;
 import net.sourceforge.plantuml.core.UmlSource;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.ugraphic.color.ColorMapperIdentity;
 import net.sourceforge.plantuml.ugraphic.color.HColor;
 import net.sourceforge.plantuml.ugraphic.color.HColorSet;
@@ -93,7 +94,7 @@ public class PSystemLatex extends AbstractPSystem {
 					scale = scale1;
 				}
 			} catch (Exception e) {
-				e.printStackTrace();
+				Logger.error(e);
 			}
 		} else if (lineLower.startsWith("dpi ")) {
 			final String value = line.substring("dpi ".length());
@@ -103,7 +104,7 @@ public class PSystemLatex extends AbstractPSystem {
 					scale = dpi1 / 96;
 				}
 			} catch (Exception e) {
-				e.printStackTrace();
+				Logger.error(e);
 			}
 		} else {
 			this.latex = line;

src/net/sourceforge/plantuml/math/PSystemMath.java

@@ -45,6 +45,7 @@ import net.sourceforge.plantuml.StringUtils;
 import net.sourceforge.plantuml.core.DiagramDescription;
 import net.sourceforge.plantuml.core.ImageData;
 import net.sourceforge.plantuml.core.UmlSource;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.ugraphic.color.ColorMapperIdentity;
 import net.sourceforge.plantuml.ugraphic.color.HColor;
 import net.sourceforge.plantuml.ugraphic.color.HColorSet;
@@ -93,7 +94,7 @@ public class PSystemMath extends AbstractPSystem {
 					scale = scale1;
 				}
 			} catch (Exception e) {
-				e.printStackTrace();
+				Logger.error(e);
 			}
 		} else if (lineLower.startsWith("dpi ")) {
 			final String value = line.substring("dpi ".length());
@@ -103,7 +104,7 @@ public class PSystemMath extends AbstractPSystem {
 					scale = dpi1 / 96;
 				}
 			} catch (Exception e) {
-				e.printStackTrace();
+				Logger.error(e);
 			}
 		} else {
 			this.math = line;

src/net/sourceforge/plantuml/math/ScientificEquationSafe.java

@@ -52,6 +52,7 @@ import net.sourceforge.plantuml.api.ImageDataSimple;
 import net.sourceforge.plantuml.core.ImageData;
 import net.sourceforge.plantuml.eps.EpsGraphics;
 import net.sourceforge.plantuml.graphic.GraphicStrings;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.security.SImageIO;
 import net.sourceforge.plantuml.svek.TextBlockBackcolored;
 import net.sourceforge.plantuml.ugraphic.AffineTransformType;
@@ -73,7 +74,7 @@ public class ScientificEquationSafe {
 		try {
 			return new ScientificEquationSafe(formula, new AsciiMath(formula));
 		} catch (Exception e) {
-			e.printStackTrace();
+			Logger.error(e);
 			Log.info("Error parsing " + formula);
 			return new ScientificEquationSafe(formula, null);
 		}
@@ -83,7 +84,7 @@ public class ScientificEquationSafe {
 		try {
 			return new ScientificEquationSafe(formula, new LatexBuilder(formula));
 		} catch (Exception e) {
-			e.printStackTrace();
+			Logger.error(e);
 			Log.info("Error parsing " + formula);
 			return new ScientificEquationSafe(formula, null);
 		}
@@ -129,7 +130,7 @@ public class ScientificEquationSafe {
 		if (equation != null) {
 			System.err.println("Latex=" + equation.getSource());
 		}
-		e.printStackTrace();
+		Logger.error(e);
 	}
 
 	private TextBlockBackcolored getRollback() {

src/net/sourceforge/plantuml/mindmap/MindMap.java

@@ -126,7 +126,7 @@ public class MindMap implements UDrawable {
 
 			return this.regular.add(skinParam.getCurrentStyleBuilder(), backColor, level, label, shape, stereotype);
 		} catch (NoStyleAvailableException e) {
-			// e.printStackTrace();
+			// Logger.error(e);
 			return CommandExecutionResult.error("General failure: no style available.");
 		}
 	}

src/net/sourceforge/plantuml/openiconic/OpenIcon.java

@@ -48,6 +48,7 @@ import net.sourceforge.plantuml.Dimension2DDouble;
 import net.sourceforge.plantuml.graphic.AbstractTextBlock;
 import net.sourceforge.plantuml.graphic.StringBounder;
 import net.sourceforge.plantuml.graphic.TextBlock;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.openiconic.data.DummyIcon;
 import net.sourceforge.plantuml.security.SFile;
 import net.sourceforge.plantuml.ugraphic.UGraphic;
@@ -69,7 +70,7 @@ public class OpenIcon {
 		try {
 			return new OpenIcon(is, name);
 		} catch (IOException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			return null;
 		}
 	}

src/net/sourceforge/plantuml/pdf/PdfConverter.java

@@ -35,6 +35,8 @@
  */
 package net.sourceforge.plantuml.pdf;
 
+import net.sourceforge.plantuml.log.Logger;
+
 import java.io.File;
 import java.lang.reflect.Method;
 
@@ -72,7 +74,7 @@ public class PdfConverter {
 			final Method execute = clSVGConverter.getMethod("execute");
 			execute.invoke(converter);
 		} catch (Exception e) {
-			e.printStackTrace();
+			Logger.error(e);
 			throw new UnsupportedOperationException();
 		}
 		if (pdfFile.exists() == false) {

src/net/sourceforge/plantuml/picoweb/PicoWebServer.java

@@ -69,6 +69,7 @@ import net.sourceforge.plantuml.core.ImageData;
 import net.sourceforge.plantuml.error.PSystemError;
 import net.sourceforge.plantuml.error.PSystemErrorUtils;
 import net.sourceforge.plantuml.graphic.QuoteUtils;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.security.SFile;
 import net.sourceforge.plantuml.version.Version;
 
@@ -138,7 +139,7 @@ public class PicoWebServer implements Runnable {
 			try {
 				sendError(e, out);
 			} catch (Throwable e1) {
-				e.printStackTrace();
+				Logger.error(e);
 			}
 		} finally {
 			try {
@@ -146,7 +147,7 @@ public class PicoWebServer implements Runnable {
 				out.close();
 				connect.close();
 			} catch (Throwable e) {
-				e.printStackTrace();
+				Logger.error(e);
 			}
 		}
 	}

src/net/sourceforge/plantuml/picoweb/PicoWebServerTest.java

@@ -2,6 +2,7 @@ package net.sourceforge.plantuml.picoweb;
 
 import net.sourceforge.plantuml.json.Json;
 import net.sourceforge.plantuml.json.JsonObject;
+import net.sourceforge.plantuml.log.Logger;
 
 import javax.imageio.ImageIO;
 import javax.imageio.stream.MemoryCacheImageInputStream;
@@ -294,7 +295,7 @@ public class PicoWebServerTest {
 				try {
 					PicoWebServer.serverLoop(serverSocket);
 				} catch (IOException e) {
-					e.printStackTrace();
+					Logger.error(e);
 				}
 			}
 		};

src/net/sourceforge/plantuml/preproc/StartDiagramExtractReader.java

@@ -43,6 +43,7 @@ import java.nio.charset.Charset;
 
 import net.sourceforge.plantuml.Log;
 import net.sourceforge.plantuml.StringLocated;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.security.SURL;
 import net.sourceforge.plantuml.utils.StartUtils;
 
@@ -86,7 +87,7 @@ public class StartDiagramExtractReader implements ReadLine {
 				}
 			}
 		} catch (IOException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			Log.error("Error " + e);
 		}
 		finished = true;

src/net/sourceforge/plantuml/preproc/Stdlib.java

@@ -24,6 +24,7 @@ import java.util.regex.Pattern;
 
 import net.sourceforge.plantuml.Log;
 import net.sourceforge.plantuml.brotli.BrotliInputStream;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.security.SFile;
 
 public class Stdlib {
@@ -53,7 +54,7 @@ public class Stdlib {
 			}
 			return new ByteArrayInputStream(data.getBytes(UTF_8));
 		} catch (IOException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			return null;
 		}
 	}

src/net/sourceforge/plantuml/preproc2/PreprocessorUtils.java

@@ -48,6 +48,7 @@ import net.sourceforge.plantuml.LineLocation;
 import net.sourceforge.plantuml.Log;
 import net.sourceforge.plantuml.StringLocated;
 import net.sourceforge.plantuml.StringUtils;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.preproc.ReadLine;
 import net.sourceforge.plantuml.preproc.ReadLineReader;
 import net.sourceforge.plantuml.preproc.ReadLineSimple;
@@ -111,7 +112,7 @@ public class PreprocessorUtils {
 			}
 			return ReadLineReader.create(new InputStreamReader(is), description);
 		} catch (IOException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			return new ReadLineSimple(s, e.toString());
 		}
 	}
@@ -124,7 +125,7 @@ public class PreprocessorUtils {
 			}
 			return getReaderInclude(url, s.getLocation(), charset);
 		} catch (IOException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			throw EaterException.located("Cannot open URL " + e.getMessage());
 		}
 

src/net/sourceforge/plantuml/project/GanttDiagram.java

@@ -66,6 +66,7 @@ import net.sourceforge.plantuml.graphic.HorizontalAlignment;
 import net.sourceforge.plantuml.graphic.InnerStrategy;
 import net.sourceforge.plantuml.graphic.StringBounder;
 import net.sourceforge.plantuml.graphic.UDrawable;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.project.core.Moment;
 import net.sourceforge.plantuml.project.core.MomentImpl;
 import net.sourceforge.plantuml.project.core.PrintScale;
@@ -247,7 +248,7 @@ public class GanttDiagram extends TitledDiagram implements ToTaskDraw, WithSprit
 						timeHeader.drawTimeFooter(ug.apply(UTranslate.dy(totalHeightWithoutFooter)));
 
 				} catch (Throwable t) {
-					t.printStackTrace();
+					Logger.error(t);
 					final UDrawable crash = new GraphvizCrash(getSource().getPlainString(), false, t);
 					crash.drawU(ug);
 

src/net/sourceforge/plantuml/real/PositiveForce.java

@@ -35,6 +35,8 @@
  */
 package net.sourceforge.plantuml.real;
 
+import net.sourceforge.plantuml.log.Logger;
+
 class PositiveForce {
 
 	private final Real fixedPoint;
@@ -68,10 +70,11 @@ class PositiveForce {
 		try {
 			fixedPointValue = fixedPoint.getCurrentValue();
 		} catch (IllegalStateException e) {
-			System.err.println("Pb with force " + this);
+			Logger.error("Pb with force " + this);
-			System.err.println("This force has been created here:");
+			Logger.error("Pb with force " + this);
-			creationPoint.printStackTrace();
+			Logger.error("This force has been created here:");
-			System.err.println("The fixed point has been created here: " + fixedPoint);
+			Logger.error(creationPoint);
+			Logger.error("The fixed point has been created here: " + fixedPoint);
 			fixedPoint.printCreationStackTrace();
 			throw e;
 		}

src/net/sourceforge/plantuml/real/RealMax.java

@@ -35,6 +35,8 @@
  */
 package net.sourceforge.plantuml.real;
 
+import net.sourceforge.plantuml.log.Logger;
+
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
@@ -93,7 +95,7 @@ class RealMax extends AbstractReal implements Real {
 	}
 
 	public void printCreationStackTrace() {
-		creationPoint.printStackTrace();
+		Logger.error(creationPoint);
 	}
 
 }

src/net/sourceforge/plantuml/real/RealMoveable.java

@@ -35,6 +35,8 @@
  */
 package net.sourceforge.plantuml.real;
 
+import net.sourceforge.plantuml.log.Logger;
+
 import java.util.concurrent.atomic.AtomicInteger;
 
 abstract class RealMoveable extends AbstractReal implements Real {
@@ -54,7 +56,7 @@ abstract class RealMoveable extends AbstractReal implements Real {
 	abstract void move(double delta);
 
 	final public void printCreationStackTrace() {
-		creationPoint.printStackTrace();
+		Logger.error(creationPoint);
 	}
 
 	final public Real addFixed(double delta) {

src/net/sourceforge/plantuml/salt/PSystemSalt.java

@@ -63,6 +63,7 @@ import net.sourceforge.plantuml.core.ImageData;
 import net.sourceforge.plantuml.core.UmlSource;
 import net.sourceforge.plantuml.graphic.InnerStrategy;
 import net.sourceforge.plantuml.graphic.StringBounder;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.salt.element.Element;
 import net.sourceforge.plantuml.salt.factory.AbstractElementFactoryComplex;
 import net.sourceforge.plantuml.salt.factory.ElementFactory;
@@ -120,7 +121,7 @@ public class PSystemSalt extends TitledDiagram implements WithSprite {
 			final Dimension2D size = salt.getPreferredDimension(stringBounder, 0, 0);
 			return createImageBuilder(fileFormatOption).drawable(getTextBlock(salt, size)).write(os);
 		} catch (Exception e) {
-			e.printStackTrace();
+			Logger.error(e);
 			UmlDiagram.exportDiagramError(os, e, fileFormatOption, seed(), getMetadata(), "none",
 					new ArrayList<String>());
 			return ImageDataSimple.error();

src/net/sourceforge/plantuml/sdot/CucaDiagramFileMakerSmetana.java

@@ -88,6 +88,7 @@ import net.sourceforge.plantuml.graphic.StringBounder;
 import net.sourceforge.plantuml.graphic.TextBlock;
 import net.sourceforge.plantuml.graphic.TextBlockUtils;
 import net.sourceforge.plantuml.graphic.USymbol;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.style.SName;
 import net.sourceforge.plantuml.style.Style;
 import net.sourceforge.plantuml.svek.Bibliotekon;
@@ -598,7 +599,7 @@ public class CucaDiagramFileMakerSmetana implements CucaDiagramFileMaker {
 	}
 
 	static private List<String> getFailureText3(Throwable exception) {
-		exception.printStackTrace();
+		Logger.error(exception);
 		final List<String> strings = new ArrayList<>();
 		strings.add("An error has occured : " + exception);
 		final String quote = StringUtils.rot(QuoteUtils.getSomeQuote());

src/net/sourceforge/plantuml/security/SFile.java

@@ -35,6 +35,8 @@
  */
 package net.sourceforge.plantuml.security;
 
+import net.sourceforge.plantuml.log.Logger;
+
 import java.awt.image.BufferedImage;
 import java.io.BufferedInputStream;
 import java.io.BufferedOutputStream;
@@ -219,7 +221,7 @@ public class SFile implements Comparable<SFile> {
 			try {
 				return internal.getCanonicalPath();
 			} catch (IOException e) {
-				e.printStackTrace();
+				Logger.error(e);
 			}
 		}
 		return "";
@@ -348,7 +350,7 @@ public class SFile implements Comparable<SFile> {
 			try {
 				return SecurityUtils.readRasterImage(new ImageIcon(this.getAbsolutePath()));
 			} catch (Exception e) {
-				e.printStackTrace();
+				Logger.error(e);
 			}
 		return null;
 	}
@@ -358,7 +360,7 @@ public class SFile implements Comparable<SFile> {
 			try {
 				return new BufferedReader(new FileReader(internal));
 			} catch (FileNotFoundException e) {
-				e.printStackTrace();
+				Logger.error(e);
 			}
 		}
 		return null;
@@ -373,7 +375,7 @@ public class SFile implements Comparable<SFile> {
 			try {
 				return new BufferedInputStream(new FileInputStream(internal));
 			} catch (FileNotFoundException e) {
-				e.printStackTrace();
+				Logger.error(e);
 			}
 		return null;
 	}

src/net/sourceforge/plantuml/security/SURL.java

@@ -68,6 +68,7 @@ import javax.net.ssl.HttpsURLConnection;
 import javax.swing.ImageIcon;
 
 import net.sourceforge.plantuml.StringUtils;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.security.authentication.SecurityAccessInterceptor;
 import net.sourceforge.plantuml.security.authentication.SecurityAuthentication;
 import net.sourceforge.plantuml.security.authentication.SecurityCredentials;
@@ -154,7 +155,7 @@ public class SURL {
 			try {
 				return create(new URL(url));
 			} catch (MalformedURLException e) {
-				e.printStackTrace();
+				Logger.error(e);
 			}
 		return null;
 	}
@@ -488,7 +489,7 @@ public class SURL {
 			try {
 				return Charset.forName(matcher.group(1));
 			} catch (Exception e) {
-				e.printStackTrace();
+				Logger.error(e);
 			}
 
 		return null;
@@ -568,7 +569,7 @@ public class SURL {
 				final ImageIcon tmp = new ImageIcon(bytes);
 				return SecurityUtils.readRasterImage(tmp);
 			} catch (Exception e) {
-				e.printStackTrace();
+				Logger.error(e);
 			}
 		return null;
 	}

src/net/sourceforge/plantuml/security/SecurityUtils.java

@@ -61,6 +61,7 @@ import net.sourceforge.plantuml.Log;
 import net.sourceforge.plantuml.StringUtils;
 import net.sourceforge.plantuml.json.Json;
 import net.sourceforge.plantuml.json.JsonValue;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.security.authentication.SecurityAccessInterceptor;
 import net.sourceforge.plantuml.security.authentication.SecurityAuthentication;
 import net.sourceforge.plantuml.security.authentication.SecurityAuthorizeManager;
@@ -426,7 +427,7 @@ public class SecurityUtils {
 			try (Reader r = new BufferedReader(new FileReader(jsonFile))) {
 				return Json.parse(r);
 			} catch (IOException e) {
-				e.printStackTrace();
+				Logger.error(e);
 			}
 		}
 		return Json.object();

src/net/sourceforge/plantuml/security/authentication/oauth/AbstractOAuth2AccessAuthorizeManager.java

@@ -38,6 +38,7 @@ package net.sourceforge.plantuml.security.authentication.oauth;
 import net.sourceforge.plantuml.json.Json;
 import net.sourceforge.plantuml.json.JsonObject;
 import net.sourceforge.plantuml.json.JsonValue;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.security.SURL;
 import net.sourceforge.plantuml.security.authentication.SecurityAuthentication;
 import net.sourceforge.plantuml.security.authentication.SecurityAuthorizeManager;
@@ -133,7 +134,7 @@ public abstract class AbstractOAuth2AccessAuthorizeManager implements SecurityAu
 		try {
 			return URLEncoder.encode(data, "UTF-8");
 		} catch (UnsupportedEncodingException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			return data;
 		}
 	}

src/net/sourceforge/plantuml/sequencediagram/SequenceDiagram.java

@@ -64,6 +64,7 @@ import net.sourceforge.plantuml.cucadiagram.Display;
 import net.sourceforge.plantuml.cucadiagram.EntityPortion;
 import net.sourceforge.plantuml.cucadiagram.Stereotype;
 import net.sourceforge.plantuml.graphic.SymbolContext;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.sequencediagram.graphic.FileMaker;
 import net.sourceforge.plantuml.sequencediagram.graphic.SequenceDiagramFileMakerPuma2;
 import net.sourceforge.plantuml.sequencediagram.graphic.SequenceDiagramTxtMaker;
@@ -444,7 +445,7 @@ public class SequenceDiagram extends UmlDiagram {
 			// The DEBUG StringBounder is ok just to compute the number of pages here.
 			return getSequenceDiagramPngMaker(1, new FileFormatOption(FileFormat.DEBUG)).getNbPages();
 		} catch (Throwable t) {
-			t.printStackTrace();
+			Logger.error(t);
 			return 1;
 		}
 	}

src/net/sourceforge/plantuml/sprite/RessourcesUtils.java

@@ -48,6 +48,7 @@ import java.util.TreeSet;
 import java.util.jar.JarEntry;
 import java.util.jar.JarFile;
 
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.security.SFile;
 import net.sourceforge.plantuml.version.Version;
 
@@ -63,7 +64,7 @@ public class RessourcesUtils {
 			try {
 				return listEntry(new SFile(local.toURI()));
 			} catch (URISyntaxException e) {
-				e.printStackTrace();
+				Logger.error(e);
 				return null;
 			}
 		}

src/net/sourceforge/plantuml/sprite/SpriteGrayLevel.java

@@ -50,6 +50,7 @@ import net.sourceforge.plantuml.code.CompressionZopfliZlib;
 import net.sourceforge.plantuml.code.NoPlantumlCompressionException;
 import net.sourceforge.plantuml.code.PairInt;
 import net.sourceforge.plantuml.code.SpiralOnRectangle;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.ugraphic.color.ColorChangerMonochrome;
 
 public enum SpriteGrayLevel {
@@ -296,7 +297,7 @@ public enum SpriteGrayLevel {
 			}
 			return result;
 		} catch (NoPlantumlCompressionException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			return null;
 		}
 	}

src/net/sourceforge/plantuml/sprite/SpriteImage.java

@@ -45,6 +45,7 @@ import net.sourceforge.plantuml.awt.geom.Dimension2D;
 import net.sourceforge.plantuml.graphic.AbstractTextBlock;
 import net.sourceforge.plantuml.graphic.StringBounder;
 import net.sourceforge.plantuml.graphic.TextBlock;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.security.SImageIO;
 import net.sourceforge.plantuml.ugraphic.AffineTransformType;
 import net.sourceforge.plantuml.ugraphic.PixelImage;
@@ -91,7 +92,7 @@ public class SpriteImage implements Sprite {
 		try {
 			return new SpriteImage(SImageIO.read(is));
 		} catch (IOException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			return null;
 		}
 

src/net/sourceforge/plantuml/sprite/StdlibDiagram.java

@@ -60,6 +60,7 @@ import net.sourceforge.plantuml.graphic.HorizontalAlignment;
 import net.sourceforge.plantuml.graphic.StringBounder;
 import net.sourceforge.plantuml.graphic.TextBlock;
 import net.sourceforge.plantuml.graphic.TextBlockUtils;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.preproc.Stdlib;
 import net.sourceforge.plantuml.ugraphic.ImageBuilder;
 import net.sourceforge.plantuml.ugraphic.UFont;
@@ -101,7 +102,7 @@ public class StdlibDiagram extends UmlDiagram {
 				try {
 					drawInternal(ug);
 				} catch (IOException e) {
-					e.printStackTrace();
+					Logger.error(e);
 				}
 			}
 
@@ -133,7 +134,7 @@ public class StdlibDiagram extends UmlDiagram {
 			try {
 				cmd.execute(this, bloc);
 			} catch (NoSuchColorException e) {
-				e.printStackTrace();
+				Logger.error(e);
 			}
 //			System.err.println("nb=" + nb);
 			nb++;

src/net/sourceforge/plantuml/stats/FormatCounter.java

@@ -44,6 +44,7 @@ import java.util.prefs.Preferences;
 
 import net.sourceforge.plantuml.FileFormat;
 import net.sourceforge.plantuml.api.NumberAnalyzed;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.stats.api.StatsColumn;
 import net.sourceforge.plantuml.stats.api.StatsLine;
 import net.sourceforge.plantuml.stats.api.StatsTable;
@@ -100,7 +101,7 @@ public class FormatCounter {
 						data.put(format, value);
 					}
 				} catch (Exception e) {
-					e.printStackTrace();
+					Logger.error(e);
 				}
 			}
 		}

src/net/sourceforge/plantuml/stats/HistoricalData.java

@@ -42,6 +42,7 @@ import java.util.List;
 import java.util.prefs.BackingStoreException;
 import java.util.prefs.Preferences;
 
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.version.Version;
 
 public class HistoricalData {
@@ -55,7 +56,7 @@ public class HistoricalData {
 		try {
 			historical.addAll(reload());
 		} catch (BackingStoreException e) {
-			e.printStackTrace();
+			Logger.error(e);
 		}
 		Collections.sort(historical, getIdComparator());
 	}

src/net/sourceforge/plantuml/stats/StatsUtils.java

@@ -44,7 +44,6 @@ import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
 import java.util.logging.Filter;
 import java.util.logging.LogRecord;
-import java.util.logging.Logger;
 import java.util.prefs.BackingStoreException;
 import java.util.prefs.Preferences;
 
@@ -52,6 +51,7 @@ import javax.xml.parsers.ParserConfigurationException;
 import javax.xml.transform.TransformerException;
 
 import net.sourceforge.plantuml.Log;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.security.SFile;
 import net.sourceforge.plantuml.security.SecurityUtils;
 import net.sourceforge.plantuml.stats.api.Stats;
@@ -84,7 +84,7 @@ public class StatsUtils {
 	static {
 		try {
 			// Logger.getLogger("java.util.prefs").setLevel(Level.OFF);
-			Logger.getLogger("java.util.prefs").setFilter(new Filter() {
+			java.util.logging.Logger.getLogger("java.util.prefs").setFilter(new Filter() {
 				public boolean isLoggable(LogRecord record) {
 					final String message = record.getMessage();
 					System.err.println("SPECIAL TRACE FOR PLANTUML: " + message);
@@ -92,13 +92,13 @@ public class StatsUtils {
 				}
 			});
 		} catch (Exception e) {
-			e.printStackTrace();
+			Logger.error(e);
 		}
 		if (prefs.getInt("VERSION", 0) != VERSION) {
 			try {
 				prefs.clear();
 			} catch (BackingStoreException e1) {
-				e1.printStackTrace();
+				Logger.error(e1);
 			}
 			prefs.putInt("VERSION", VERSION);
 		}
@@ -154,7 +154,7 @@ public class StatsUtils {
 				htmlOutput(stats);
 			}
 		} catch (Exception e) {
-			e.printStackTrace();
+			Logger.error(e);
 		}
 	}
 

src/net/sourceforge/plantuml/stats/StatsUtilsIncrement.java

@@ -46,6 +46,7 @@ import net.sourceforge.plantuml.core.Diagram;
 import net.sourceforge.plantuml.directdot.PSystemDot;
 import net.sourceforge.plantuml.eggs.PSystemWelcome;
 import net.sourceforge.plantuml.error.PSystemErrorUtils;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.math.PSystemMath;
 import net.sourceforge.plantuml.salt.PSystemSalt;
 import net.sourceforge.plantuml.stats.api.Stats;
@@ -174,7 +175,7 @@ public class StatsUtilsIncrement {
 						lockHtml.unlock();
 					}
 			} catch (Exception e) {
-				e.printStackTrace();
+				Logger.error(e);
 			}
 
 		}

src/net/sourceforge/plantuml/style/CommandStyleMultilinesCSS.java

@@ -72,7 +72,7 @@ public class CommandStyleMultilinesCSS extends CommandMultilines2<TitledDiagram>
 			((SkinParam) diagram.getSkinParam()).applyPendingStyleMigration();
 			return CommandExecutionResult.ok();
 		} catch (NoStyleAvailableException e) {
-			// e.printStackTrace();
+			// Logger.error(e);
 			return CommandExecutionResult.error("General failure: no style available.");
 		}
 	}

src/net/sourceforge/plantuml/svek/CucaDiagramFileMakerSvek.java

@@ -52,6 +52,7 @@ import net.sourceforge.plantuml.cucadiagram.dot.CucaDiagramSimplifierActivity;
 import net.sourceforge.plantuml.cucadiagram.dot.CucaDiagramSimplifierState;
 import net.sourceforge.plantuml.cucadiagram.dot.DotData;
 import net.sourceforge.plantuml.graphic.StringBounder;
+import net.sourceforge.plantuml.log.Logger;
 
 public final class CucaDiagramFileMakerSvek implements CucaDiagramFileMaker {
 
@@ -66,7 +67,7 @@ public final class CucaDiagramFileMakerSvek implements CucaDiagramFileMaker {
 		try {
 			return createFileInternal(os, dotStrings, fileFormatOption);
 		} catch (InterruptedException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			throw new IOException(e);
 		}
 	}

src/net/sourceforge/plantuml/svek/GeneralImageBuilder.java

@@ -98,6 +98,7 @@ import net.sourceforge.plantuml.graphic.USymbol;
 import net.sourceforge.plantuml.graphic.USymbolHexagon;
 import net.sourceforge.plantuml.graphic.USymbolInterface;
 import net.sourceforge.plantuml.graphic.USymbols;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.style.PName;
 import net.sourceforge.plantuml.style.SName;
 import net.sourceforge.plantuml.style.Style;
@@ -437,7 +438,7 @@ public final class GeneralImageBuilder {
 					}
 				}
 			} catch (IllegalStateException e) {
-				e.printStackTrace();
+				Logger.error(e);
 			}
 		}
 

src/net/sourceforge/plantuml/svg/SvgGraphics.java

@@ -60,6 +60,8 @@ import javax.xml.transform.TransformerException;
 import javax.xml.transform.dom.DOMSource;
 import javax.xml.transform.stream.StreamResult;
 
+import net.sourceforge.plantuml.log.Logger;
+
 import org.w3c.dom.CDATASection;
 import org.w3c.dom.Comment;
 import org.w3c.dom.Document;
@@ -178,7 +180,7 @@ public class SvgGraphics {
 					defs.appendChild(script);
 			}
 		} catch (ParserConfigurationException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			throw new IllegalStateException(e);
 		}
 	}
@@ -238,7 +240,7 @@ public class SvgGraphics {
 			final InputStream is = SvgGraphics.class.getResourceAsStream("/svg/" + name);
 			return FileUtils.readText(is);
 		} catch (IOException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			return null;
 		}
 	}

src/net/sourceforge/plantuml/swing/ImageWindow.java

@@ -71,6 +71,7 @@ import javax.swing.WindowConstants;
 import net.sourceforge.plantuml.GeneratedImage;
 import net.sourceforge.plantuml.ImageSelection;
 import net.sourceforge.plantuml.graphic.GraphicStrings;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.security.SImageIO;
 import net.sourceforge.plantuml.security.SFile;
 import net.sourceforge.plantuml.svek.TextBlockBackcolored;
@@ -337,7 +338,7 @@ class ImageWindow extends JFrame {
 				final byte[] bytes = plainPngBuilder(error).writeByteArray();
 				image = SImageIO.read(bytes);
 			} catch (IOException e) {
-				e.printStackTrace();
+				Logger.error(e);
 			}
 		}
 		final ImageIcon imageIcon = new ImageIcon(image, simpleLine.toString());
@@ -393,7 +394,7 @@ class ImageWindow extends JFrame {
 			final ImageSelection imgSel = new ImageSelection(image);
 			Toolkit.getDefaultToolkit().getSystemClipboard().setContents(imgSel, null);
 		} catch (IOException e) {
-			e.printStackTrace();
+			Logger.error(e);
 		}
 	}
 

src/net/sourceforge/plantuml/swing/MainWindow.java

@@ -83,6 +83,7 @@ import net.sourceforge.plantuml.DirWatcher2;
 import net.sourceforge.plantuml.GeneratedImage;
 import net.sourceforge.plantuml.Log;
 import net.sourceforge.plantuml.Option;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.version.PSystemVersion;
 
 public class MainWindow extends JFrame {
@@ -337,12 +338,8 @@ public class MainWindow extends JFrame {
 						jList1.setListData(new Vector<>(currentDirectoryListing2));
 						jList1.setVisible(true);
 					}
-				} catch (IOException e) {
+				} catch (IOException | InterruptedException | ExecutionException e) {
-					e.printStackTrace();
+					Logger.error(e);
-				} catch (InterruptedException e) {
-					e.printStackTrace();
-				} catch (ExecutionException e) {
-					e.printStackTrace();
 				}
 			}
 		});

src/net/sourceforge/plantuml/telnet/AcceptTelnetClient.java

@@ -45,6 +45,7 @@ import net.sourceforge.plantuml.FileFormat;
 import net.sourceforge.plantuml.FileFormatOption;
 import net.sourceforge.plantuml.Log;
 import net.sourceforge.plantuml.SourceStringReader;
+import net.sourceforge.plantuml.log.Logger;
 
 class AcceptTelnetClient extends Thread {
 	final private Socket clientSocket;
@@ -85,7 +86,7 @@ class AcceptTelnetClient extends Thread {
 			os.close();
 			br.close();
 		} catch (IOException e) {
-			e.printStackTrace();
+			Logger.error(e);
 		}
 
 	}

src/net/sourceforge/plantuml/tim/EaterTheme.java

@@ -43,6 +43,7 @@ import java.io.UnsupportedEncodingException;
 
 import net.sourceforge.plantuml.AFile;
 import net.sourceforge.plantuml.StringLocated;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.preproc.FileWithSuffix;
 import net.sourceforge.plantuml.preproc.ImportedFiles;
 import net.sourceforge.plantuml.preproc.ReadLine;
@@ -96,7 +97,7 @@ public class EaterTheme extends Eater {
 						return ReadLineReader.create(br, "theme " + realName);
 				}
 			} catch (IOException e) {
-				e.printStackTrace();
+				Logger.error(e);
 			}
 			throw EaterException.located("Cannot load " + realName);
 
@@ -108,7 +109,7 @@ public class EaterTheme extends Eater {
 			try {
 				return PreprocessorUtils.getReaderInclude(url, getLineLocation(), UTF_8);
 			} catch (UnsupportedEncodingException e) {
-				e.printStackTrace();
+				Logger.error(e);
 				throw EaterException.located("Cannot decode charset");
 			}
 		}
@@ -121,7 +122,7 @@ public class EaterTheme extends Eater {
 
 			return ReadLineReader.create(tmp, "theme " + realName);
 		} catch (IOException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			throw EaterException.located("Cannot load " + realName);
 		}
 

src/net/sourceforge/plantuml/tim/TContext.java

@@ -54,6 +54,7 @@ import net.sourceforge.plantuml.StringLocated;
 import net.sourceforge.plantuml.command.CommandExecutionResult;
 import net.sourceforge.plantuml.json.Json;
 import net.sourceforge.plantuml.json.JsonValue;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.preproc.Defines;
 import net.sourceforge.plantuml.preproc.FileWithSuffix;
 import net.sourceforge.plantuml.preproc.ImportedFiles;
@@ -300,7 +301,7 @@ public class TContext {
 				throw (EaterException) e;
 			if (e instanceof EaterExceptionLocated)
 				throw (EaterExceptionLocated) e;
-			e.printStackTrace();
+			Logger.error(e);
 			throw EaterException.located("Fatal parsing error");
 		}
 	}
@@ -501,7 +502,7 @@ public class TContext {
 				return;
 			}
 		} catch (IOException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			throw EaterException.located("Cannot import " + e.getMessage());
 		}
 
@@ -549,7 +550,7 @@ public class TContext {
 						}
 					}
 				} catch (IOException e) {
-					e.printStackTrace();
+					Logger.error(e);
 					throw EaterException.located("cannot include " + location);
 				}
 			}
@@ -585,13 +586,13 @@ public class TContext {
 				body.add(sl);
 			} while (true);
 		} catch (IOException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			throw EaterException.located("" + e);
 		} finally {
 			try {
 				reader2.close();
 			} catch (IOException e) {
-				e.printStackTrace();
+				Logger.error(e);
 			}
 		}
 	}
@@ -614,13 +615,13 @@ public class TContext {
 				body.add(sl);
 			} while (true);
 		} catch (IOException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			throw EaterException.located("Error reading theme " + e);
 		} finally {
 			try {
 				reader.close();
 			} catch (IOException e) {
-				e.printStackTrace();
+				Logger.error(e);
 			}
 		}
 	}
@@ -691,14 +692,14 @@ public class TContext {
 				}
 			}
 		} catch (IOException e) {
-			e.printStackTrace();
+			Logger.error(e);
 			throw EaterException.located("cannot include " + e);
 		} finally {
 			if (reader != null) {
 				try {
 					reader.close();
 				} catch (IOException e) {
-					e.printStackTrace();
+					Logger.error(e);
 				}
 			}
 		}

src/net/sourceforge/plantuml/tim/TimLoader.java

@@ -40,6 +40,7 @@ import java.util.Set;
 
 import net.sourceforge.plantuml.DefinitionsContainer;
 import net.sourceforge.plantuml.StringLocated;
+import net.sourceforge.plantuml.log.Logger;
 import net.sourceforge.plantuml.preproc.Defines;
 import net.sourceforge.plantuml.preproc.FileWithSuffix;
 import net.sourceforge.plantuml.preproc.ImportedFiles;
@@ -57,7 +58,7 @@ public class TimLoader {
 		try {
 			defines.copyTo(global);
 		} catch (EaterException e) {
-			e.printStackTrace();
+			Logger.error(e);
 		}
 	}