java.lang.StringIndexOutOfBoundsException: String index out of range: 0
   at java.lang.String.charAt(String.java:658)
   at org.netbeans.api.java.source.TreeUtilities.decodeIdentifierInternal(TreeUtilities.java:1091)
   at org.netbeans.api.java.source.TreeUtilities.decodeIdentifier(TreeUtilities.java:1076)
   at org.netbeans.modules.java.editor.semantic.TokenList$3.run(TokenList.java:196)
   at org.netbeans.editor.BaseDocument.render(BaseDocument.java:1391)
   at org.netbeans.modules.java.editor.semantic.TokenList.firstIdentifier(TokenList.java:177)
   at org.netbeans.modules.java.editor.semantic.SemanticHighlighter$DetectorVisitor.firstIdentifier(SemanticHighlighter.java:421)
   at org.netbeans.modules.java.editor.semantic.SemanticHighlighter$DetectorVisitor.visitClass(SemanticHighlighter.java:1171)
   at org.netbeans.modules.java.editor.semantic.SemanticHighlighter$DetectorVisitor.visitClass(SemanticHighlighter.java:392)
   at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:719)
   at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:68)
   at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:94)
   at com.sun.source.util.TreeScanner.scan(TreeScanner.java:91)
   at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:103)
   at org.netbeans.modules.java.editor.semantic.SemanticHighlighter$DetectorVisitor.visitCompilationUnit(SemanticHighlighter.java:729)
   at org.netbeans.modules.java.editor.semantic.SemanticHighlighter$DetectorVisitor.visitCompilationUnit(SemanticHighlighter.java:392)
   at com.sun.tools.javac.tree.JCTree$JCCompilationUnit.accept(JCTree.java:551)
   at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:68)
   at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:94)
   at org.netbeans.modules.java.editor.semantic.SemanticHighlighter.process(SemanticHighlighter.java:239)
   at org.netbeans.modules.java.editor.semantic.SemanticHighlighter.process(SemanticHighlighter.java:216)
   at org.netbeans.modules.java.editor.semantic.SemanticHighlighter.run(SemanticHighlighter.java:174)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callParserResultTask(TaskProcessor.java:568)
   at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:744)
   at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
   at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
   at java.util.concurrent.FutureTask.run(FutureTask.java:166)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1432)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2042)