rolling back code incompatible with Java 8

src/net/sourceforge/plantuml/StringUtils.java

@@ -468,7 +468,7 @@ public class StringUtils {
 	public static String manageUnicodeNotationUplus(String s) {
 		final Pattern pattern = Pattern.compile("\\<U\\+([0-9a-fA-F]{4,5})\\>");
 		final Matcher matcher = pattern.matcher(s);
-		final StringBuilder result = new StringBuilder();
+		final StringBuffer result = new StringBuffer(); // Can't be switched to StringBuilder in order to support Java 8
 		while (matcher.find()) {
 			final String num = matcher.group(1);
 			final int value = Integer.parseInt(num, 16);
@@ -482,7 +482,7 @@ public class StringUtils {
 	public static String manageAmpDiese(String s) {
 		final Pattern pattern = Pattern.compile("\\&#([0-9]+);");
 		final Matcher matcher = pattern.matcher(s);
-		final StringBuilder result = new StringBuilder();
+		final StringBuffer result = new StringBuffer(); // Can't be switched to StringBuilder in order to support Java 8
 		while (matcher.find()) {
 			final String num = matcher.group(1);
 			final char c = (char) Integer.parseInt(num);

src/net/sourceforge/plantuml/asciiart/ComponentTextArrow.java

@@ -92,7 +92,7 @@ public class ComponentTextArrow extends AbstractComponentText implements ArrowCo
 		if (fileFormat == FileFormat.UTXT) {
 			final Pattern pattern = Pattern.compile("\\<b\\>([0-9]+)\\</b\\>");
 			final Matcher matcher = pattern.matcher(s);
-			final StringBuilder result = new StringBuilder();
+			final StringBuffer result = new StringBuffer(); // Can't be switched to StringBuilder in order to support Java 8
 			while (matcher.find()) {
 				final String num = matcher.group(1);
 				final String replace = StringUtils.toInternalBoldNumber(num);

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

@@ -62,7 +62,7 @@ public class PreprocessorUtils {
 		final Pattern p = Pattern.compile("%(\\w+)%");
 
 		final Matcher m = p.matcher(s);
-		final StringBuilder sb = new StringBuilder();
+		final StringBuffer sb = new StringBuffer(); // Can't be switched to StringBuilder in order to support Java 8
 		while (m.find()) {
 			final String var = m.group(1);
 			final String value = getenv(var);

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

@@ -940,7 +940,7 @@ public class SvgGraphics {
 	private String formatTitle(String title) {
 		final Pattern p = Pattern.compile("\\<U\\+([0-9A-Fa-f]+)\\>");
 		final Matcher m = p.matcher(title);
-		final StringBuilder sb = new StringBuilder();
+		final StringBuffer sb = new StringBuffer(); // Can't be switched to StringBuilder in order to support Java 8
 		while (m.find()) {
 			final String num = m.group(1);
 			final char c = (char) Integer.parseInt(num, 16);

src/net/sourceforge/plantuml/utils/Cypher.java

@@ -80,7 +80,7 @@ public class Cypher {
 	public synchronized String cypher(String s) {
 
 		final Matcher m = p.matcher(s);
-		final StringBuilder sb = new StringBuilder();
+		final StringBuffer sb = new StringBuffer(); // Can't be switched to StringBuilder in order to support Java 8
 		while (m.find()) {
 			final String word = m.group(0);
 			m.appendReplacement(sb, changeWord(word));