java.lang.NullPointerException
   at com.sun.tools.javac.code.Types$ImplementationCache.get(Types.java:2073)
   at com.sun.tools.javac.code.Types.implementation(Types.java:2101)
   at com.sun.tools.javac.code.Symbol$MethodSymbol.implementation(Symbol.java:1320)
   at com.sun.tools.javac.code.Symbol$MethodSymbol.implementation(Symbol.java:1309)
   at com.sun.tools.javac.comp.Check.checkImplementations(Check.java:2063)
   at com.sun.tools.javac.comp.Check.checkImplementations(Check.java:2041)
   at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:3295)
   at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:3218)
   at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:3149)
   at com.sun.tools.javac.comp.Attr.attrib(Attr.java:3123)
   at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1264)
   at com.sun.tools.javac.api.JavacTaskImpl$1.process(JavacTaskImpl.java:461)
   at com.sun.tools.javac.api.JavacTaskImpl$Filter.run(JavacTaskImpl.java:613)
   at com.sun.tools.javac.api.JavacTaskImpl.analyze(JavacTaskImpl.java:464)
   at org.netbeans.modules.java.source.TreeLoader.loadTreeFor(TreeLoader.java:169)
   at com.sun.tools.javac.code.Symbol$ParamSymbol.getSimpleName(Symbol.java:1091)
   at com.sun.tools.javac.code.Symbol$ParamSymbol.toString(Symbol.java:1104)
   at com.sun.tools.javadoc.ParameterImpl.name(ParameterImpl.java:69)
   at org.netbeans.api.java.source.ui.ElementJavadoc.paramPos(ElementJavadoc.java:1617)
   at org.netbeans.api.java.source.ui.ElementJavadoc.inheritedDocFor(ElementJavadoc.java:1494)
   at org.netbeans.api.java.source.ui.ElementJavadoc.prepareContent(ElementJavadoc.java:522)
   at org.netbeans.api.java.source.ui.ElementJavadoc.<init>(ElementJavadoc.java:310)
   at org.netbeans.api.java.source.ui.ElementJavadoc.create(ElementJavadoc.java:149)
   at org.netbeans.modules.editor.java.JavaCompletionDoc.create(JavaCompletionDoc.java:90)
   at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery.resolveDocumentation(JavaCompletionProvider.java:569)
   at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery.run(JavaCompletionProvider.java:404)
   at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery$Task.run(JavaCompletionProvider.java:4926)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:154)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:138)
   at org.netbeans.modules.parsing.impl.TaskProcessor$1.call(TaskProcessor.java:201)
   at org.netbeans.modules.parsing.impl.TaskProcessor$1.call(TaskProcessor.java:198)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:168)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:356)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:66)
Caused: org.netbeans.modules.parsing.spi.ParseException
   at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:206)
   at org.netbeans.modules.parsing.impl.TaskProcessor.runWhenScanFinished(TaskProcessor.java:235)
   at org.netbeans.modules.parsing.api.ParserManager.parseWhenScanFinished(ParserManager.java:131)
   at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery.query(JavaCompletionProvider.java:290)
   at org.netbeans.spi.editor.completion.support.AsyncCompletionTask.run(AsyncCompletionTask.java:223)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1424)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1968)