java.lang.NullPointerException
        at org.netbeans.modules.java.editor.semantic.TokenList$.run(TokenList.java:189)
        at org.netbeans.editor.BaseDocument.render(BaseDocument.java:1362)
        at org.netbeans.modules.java.editor.semantic.TokenList.firstIdentifier(TokenList.java:174)
        at org.netbeans.modules.java.editor.semantic.SemanticHighlighter$DetectorVisitor.firstIdentifier(SemanticHighlighter.java:476)
        at org.netbeans.modules.java.editor.semantic.SemanticHighlighter$DetectorVisitor.visitClass(SemanticHighlighter.java:1292)
        at org.netbeans.modules.java.editor.semantic.SemanticHighlighter$DetectorVisitor.visitClass(SemanticHighlighter.java:440)
        at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:605)
        at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:67)
        at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:91)
        at com.sun.source.util.TreeScanner.scan(TreeScanner.java:90)
        at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:100)
        at org.netbeans.modules.java.editor.semantic.SemanticHighlighter$DetectorVisitor.visitCompilationUnit(SemanticHighlighter.java:790)
        at org.netbeans.modules.java.editor.semantic.SemanticHighlighter$DetectorVisitor.visitCompilationUnit(SemanticHighlighter.java:440)
        at com.sun.tools.javac.tree.JCTree$JCCompilationUnit.accept(JCTree.java:483)
        at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:67)
        at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:91)
        at org.netbeans.modules.java.editor.semantic.SemanticHighlighter.process(SemanticHighlighter.java:279)
        at org.netbeans.modules.java.editor.semantic.SemanticHighlighter.process(SemanticHighlighter.java:256)
        at org.netbeans.modules.java.editor.semantic.SemanticHighlighter.run(SemanticHighlighter.java:194)
        at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:683)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
        at java.util.concurrent.FutureTask.run(FutureTask.java:138)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:619)