java.lang.NullPointerException
        at org.netbeans.modules.scala.editing.JavaScalaMapping.isScala(JavaScalaMapping.java:159)
        at org.netbeans.modules.scala.editing.JavaIndex.getDeclaredTypes(JavaIndex.java:242)
        at org.netbeans.modules.scala.editing.ScalaIndex.getDeclaredTypes(ScalaIndex.java:271)
        at org.netbeans.modules.scala.editing.ScalaCodeCompletion.completeNew(ScalaCodeCompletion.java:1479)
        at org.netbeans.modules.scala.editing.ScalaCodeCompletion.complete(ScalaCodeCompletion.java:460)
        at org.netbeans.modules.csl.editor.completion.GsfCompletionProvider$JavaCompletionQuery.addCodeCompletionItems(GsfCompletionProvider.java:607)
        at org.netbeans.modules.csl.editor.completion.GsfCompletionProvider$JavaCompletionQuery.resolveCompletion(GsfCompletionProvider.java:595)
        at org.netbeans.modules.csl.editor.completion.GsfCompletionProvider$JavaCompletionQuery.access$400(GsfCompletionProvider.java:243)
        at org.netbeans.modules.csl.editor.completion.GsfCompletionProvider$JavaCompletionQuery$1.run(GsfCompletionProvider.java:333)
        at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:129)
        at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:113)
Caused: org.netbeans.modules.parsing.spi.ParseException
        at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:191)
        at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:99)
        at org.netbeans.modules.csl.editor.completion.GsfCompletionProvider$JavaCompletionQuery.query(GsfCompletionProvider.java:319)
        at org.netbeans.spi.editor.completion.support.AsyncCompletionTask.run(AsyncCompletionTask.java:218)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:602)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1070)