java.lang.IllegalArgumentException: Unsupported type: <nulltype>, kind: NULL
   at org.netbeans.modules.java.source.usages.ClassFileUtil.encodeType(ClassFileUtil.java:319)
   at org.netbeans.modules.java.source.usages.ClassFileUtil.createFieldDescriptor(ClassFileUtil.java:174)
   at org.netbeans.api.java.source.ElementHandle.createImpl(ElementHandle.java:463)
   at org.netbeans.api.java.source.ElementHandle.create(ElementHandle.java:397)
   at org.netbeans.api.java.source.ui.ElementJavadoc.createLink(ElementJavadoc.java:1418)
   at org.netbeans.api.java.source.ui.ElementJavadoc.appendAnnotationValue(ElementJavadoc.java:1012)
   at org.netbeans.api.java.source.ui.ElementJavadoc.appendAnnotationValue(ElementJavadoc.java:1005)
   at org.netbeans.api.java.source.ui.ElementJavadoc.getAnnotations(ElementJavadoc.java:978)
   at org.netbeans.api.java.source.ui.ElementJavadoc.getClassHeader(ElementJavadoc.java:907)
   at org.netbeans.api.java.source.ui.ElementJavadoc.prepareContent(ElementJavadoc.java:501)
   at org.netbeans.api.java.source.ui.ElementJavadoc.<init>(ElementJavadoc.java:381)
   at org.netbeans.api.java.source.ui.ElementJavadoc.create(ElementJavadoc.java:159)
   at org.netbeans.modules.editor.java.JavaCompletionDoc.create(JavaCompletionDoc.java:90)
   at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery.resolveDocumentation(JavaCompletionProvider.java:603)
   at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery.run(JavaCompletionProvider.java:435)
   at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery$Task.run(JavaCompletionProvider.java:5848)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:593)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:155)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:139)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:206)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:203)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:74)
Caused: org.netbeans.modules.parsing.spi.ParseException
   at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:211)
   at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:106)
   at org.netbeans.modules.editor.java.JavaCompletionProvider$JavaCompletionQuery.query(JavaCompletionProvider.java:301)
   at org.netbeans.spi.editor.completion.support.AsyncCompletionTask.run(AsyncCompletionTask.java:223)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1432)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2042)