java.lang.NullPointerException
        at org.netbeans.modules.editor.hints.AnnotationHolder.setErrorDescriptionsImpl(AnnotationHolder.java:827)
        at org.netbeans.modules.editor.hints.AnnotationHolder.access$1200(AnnotationHolder.java:110)
        at org.netbeans.modules.editor.hints.AnnotationHolder$4.run(AnnotationHolder.java:801)
        at org.netbeans.editor.BaseDocument.render(BaseDocument.java:1217)
        at org.netbeans.modules.editor.hints.AnnotationHolder.setErrorDescriptions(AnnotationHolder.java:798)
        at org.netbeans.modules.editor.hints.HintsControllerImpl.setErrorsImpl(HintsControllerImpl.java:105)
        at org.netbeans.modules.editor.hints.HintsControllerImpl.setErrors(HintsControllerImpl.java:95)
        at org.netbeans.spi.editor.hints.HintsController$2.run(HintsController.java:90)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:561)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:986)