javax.jmi.reflect.InvalidObjectException: Object was deleted.
	at org.netbeans.modules.javacore.jmiimpl.javamodel.MetadataElement.throwInvalidObject(MetadataElement.java:145)
	at org.netbeans.modules.javacore.jmiimpl.javamodel.MetadataElement.initCheck(MetadataElement.java:129)
	at org.netbeans.modules.javacore.jmiimpl.javamodel.SemiPersistentElement.getElementInfo(SemiPersistentElement.java:185)
	at org.netbeans.modules.javacore.jmiimpl.javamodel.SemiPersistentElement.getInternalForm(SemiPersistentElement.java:829)
	at org.netbeans.modules.javacore.jmiimpl.javamodel.MetadataElement.getASTree(MetadataElement.java:501)
	at org.netbeans.modules.javacore.jmiimpl.javamodel.MetadataElement.getPosition(MetadataElement.java:507)
	at org.netbeans.modules.javacore.jmiimpl.javamodel.ElementFinder.getElementByOffset(ElementFinder.java:38)
	at org.netbeans.modules.javacore.jmiimpl.javamodel.ResourceImpl.getElementByOffset(ResourceImpl.java:1601)
	at org.netbeans.modules.java.hints.JavaHintsProvider$UnreportedExceptionHintCreator.createHint(JavaHintsProvider.java:219)
	at org.netbeans.modules.java.hints.JavaHintsProvider.getHints(JavaHintsProvider.java:125)
	at org.netbeans.modules.editor.hints.HintsOperator$HintPopupTaskImpl.run(HintsOperator.java:221)
	at org.openide.util.Task.run(Task.java:207)
	at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:469)
[catch] at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:870)