java.lang.NullPointerException
        at com.sun.tools.javac.tree.TreeInfo$1DeclScanner.visitTypeParameter(TreeInfo.java:503)
        at com.sun.tools.javac.tree.JCTree$JCTypeParameter.accept(JCTree.java:1874)
        at com.sun.tools.javac.tree.TreeInfo$1DeclScanner.scan(TreeInfo.java:484)
        at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:57)
        at com.sun.tools.javac.tree.TreeScanner.visitMethodDef(TreeScanner.java:86)
        at com.sun.tools.javac.tree.TreeInfo$1DeclScanner.visitMethodDef(TreeInfo.java:496)
        at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:657)
        at com.sun.tools.javac.tree.TreeInfo$1DeclScanner.scan(TreeInfo.java:484)
        at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:57)
        at com.sun.tools.javac.tree.TreeScanner.visitClassDef(TreeScanner.java:80)
        at com.sun.tools.javac.tree.TreeInfo$1DeclScanner.visitClassDef(TreeInfo.java:492)
        at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:588)
        at com.sun.tools.javac.tree.TreeInfo$1DeclScanner.scan(TreeInfo.java:484)
        at com.sun.tools.javac.tree.TreeScanner.visitNewClass(TreeScanner.java:202)
        at com.sun.tools.javac.tree.JCTree$JCNewClass.accept(JCTree.java:1350)
        at com.sun.tools.javac.tree.TreeInfo$1DeclScanner.scan(TreeInfo.java:484)
        at com.sun.tools.javac.tree.TreeScanner.visitVarDef(TreeScanner.java:95)
        at com.sun.tools.javac.tree.TreeInfo$1DeclScanner.visitVarDef(TreeInfo.java:500)
        at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:713)
        at com.sun.tools.javac.tree.TreeInfo$1DeclScanner.scan(TreeInfo.java:484)
        at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:57)
        at com.sun.tools.javac.tree.TreeScanner.visitClassDef(TreeScanner.java:80)
        at com.sun.tools.javac.tree.TreeInfo$1DeclScanner.visitClassDef(TreeInfo.java:492)
        at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:588)
        at com.sun.tools.javac.tree.TreeInfo.declarationFor(TreeInfo.java:508)
        at com.sun.tools.javac.model.JavacElements.getTreeAndTopLevel(JavacElements.java:632)
        at com.sun.tools.javac.model.JavacElements.getTreeAndTopLevel(JavacElements.java:652)
        at com.sun.tools.javac.api.JavacTrees.getTree(JavacTrees.java:156)
        at com.sun.tools.javac.api.JavacTrees.getTree(JavacTrees.java:152)
        at com.sun.tools.javac.api.JavacTrees.getTree(JavacTrees.java:148)
        at com.sun.tools.javac.api.JavacTrees.getTree(JavacTrees.java:84)
        at org.netbeans.modules.java.editor.javadoc.JavadocCompletionUtils.findJavadocTokenSequence(JavadocCompletionUtils.java:179)
        at org.netbeans.modules.java.editor.javadoc.JavadocImports.computeTokensOfReferencedElements(JavadocImports.java:152)
        at org.netbeans.modules.java.editor.semantic.FindLocalUsagesQuery.handleJavadoc(FindLocalUsagesQuery.java:99)
        at org.netbeans.modules.java.editor.semantic.FindLocalUsagesQuery.visitVariable(FindLocalUsagesQuery.java:131)
        at org.netbeans.modules.java.editor.semantic.FindLocalUsagesQuery.visitVariable(FindLocalUsagesQuery.java:66)
        at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:724)
        at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:67)
        at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:91)
        at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:80)
        at com.sun.source.util.TreeScanner.scan(TreeScanner.java:90)
        at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:100)
        at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:98)
        at com.sun.source.util.TreeScanner.visitClass(TreeScanner.java:132)
        at org.netbeans.modules.java.editor.semantic.FindLocalUsagesQuery.visitClass(FindLocalUsagesQuery.java:142)
        at org.netbeans.modules.java.editor.semantic.FindLocalUsagesQuery.visitClass(FindLocalUsagesQuery.java:66)
        at com.sun.tools.javac.tree.JCTree$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 com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:98)
        at com.sun.source.util.TreeScanner.visitCompilationUnit(TreeScanner.java:119)
        at com.sun.tools.javac.tree.JCTree$JCCompilationUnit.accept(JCTree.java:483)
        at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:67)
        at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:91)
        at org.netbeans.modules.java.editor.semantic.FindLocalUsagesQuery.findUsages(FindLocalUsagesQuery.java:83)
        at org.netbeans.modules.java.editor.semantic.MarkOccurrencesHighlighter.processImpl(MarkOccurrencesHighlighter.java:368)
        at org.netbeans.modules.java.editor.semantic.MarkOccurrencesHighlighter.run(MarkOccurrencesHighlighter.java:135)
        at org.netbeans.modules.java.editor.semantic.MarkOccurrencesHighlighter.run(MarkOccurrencesHighlighter.java:97)
        at org.netbeans.api.java.source.JavaSource$CompilationJob.run(JavaSource.java:1670)
        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)