java.lang.AssertionError
        at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:2780)
        at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:2719)
        at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:2650)
        at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1076)
        at com.sun.tools.javac.api.JavacTaskImpl$2.process(JavacTaskImpl.java:450)
        at com.sun.tools.javac.api.JavacTaskImpl$Filter.run(JavacTaskImpl.java:598)
        at com.sun.tools.javac.api.JavacTaskImpl.analyze(JavacTaskImpl.java:453)
        at org.netbeans.modules.java.source.TreeLoader.loadTreeFor(TreeLoader.java:143)
        at com.sun.tools.javac.code.Symbol$ParamSymbol.getSimpleName(Symbol.java:1045)
        at com.sun.tools.javac.code.Symbol$ParamSymbol.toString(Symbol.java:1058)
        at com.sun.tools.javadoc.ParameterImpl.name(ParameterImpl.java:69)
        at org.netbeans.api.java.source.ui.ElementJavadoc.paramPos(ElementJavadoc.java:1450)
        at org.netbeans.api.java.source.ui.ElementJavadoc.inheritedDocFor(ElementJavadoc.java:1184)
        at org.netbeans.api.java.source.ui.ElementJavadoc.prepareContent(ElementJavadoc.java:421)
        at org.netbeans.api.java.source.ui.ElementJavadoc.<init>(ElementJavadoc.java:249)
        at org.netbeans.api.java.source.ui.ElementJavadoc.create(ElementJavadoc.java:119)
        at org.netbeans.modules.editor.java.JavaCompletionDoc.create(JavaCompletionDoc.java:82)
        at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery.resolveDocumentation(JavaCompletionProvider.java:542)
        at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery.run(JavaCompletionProvider.java:379)
        at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery$Task.run(JavaCompletionProvider.java:4504)
        at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:123)
        at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:105)
        at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:191)
        at org.netbeans.modules.parsing.impl.TaskProcessor.runWhenScanFinished(TaskProcessor.java:247)
        at org.netbeans.modules.parsing.api.ParserManager.parseWhenScanFinished(ParserManager.java:100)
        at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery.query(JavaCompletionProvider.java:277)
        at org.netbeans.spi.editor.completion.support.AsyncCompletionTask.run(AsyncCompletionTask.java:218)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:573)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1005)