java.lang.NullPointerException
        at com.sun.tools.javac.comp.MemberEnter.getMethodEnv(MemberEnter.java:783)
        at com.sun.tools.javac.api.JavacTrees.getAttrContext(JavacTrees.java:272)
        at com.sun.tools.javac.api.JavacTrees.getScope(JavacTrees.java:192)
        at com.sun.tools.javac.api.JavacTrees.getScope(JavacTrees.java:84)
        at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery.getEnvImpl(JavaCompletionProvider.java:4237)
        at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery.getCompletionEnvironment(JavaCompletionProvider.java:4193)
        at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery.resolveCompletion(JavaCompletionProvider.java:521)
        at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery.run(JavaCompletionProvider.java:358)
        at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery.run(JavaCompletionProvider.java:122)
        at org.netbeans.api.java.source.JavaSource.runUserActionTask(JavaSource.java:669)
        at org.netbeans.api.java.source.JavaSource.runWhenScanFinished(JavaSource.java:801)
        at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery.query(JavaCompletionProvider.java:266)
        at org.netbeans.spi.editor.completion.support.AsyncCompletionTask.run(AsyncCompletionTask.java:218)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:572)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:997)