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Produced because refactoring threw an exception when I pasted between packages, but perfectly easy to cause by copying files outside the IDE: I had a class in the package org.netbeans.modules.optionscore but it's package statement said org.netbeans.spi.options When I corrected the package statement in the editor, the following exception was thrown: javax.jmi.reflect.InvalidObjectException: Object with MOFID AFE8726C-1497-11D9-98A5-1F683AE5AA77: 0000000000000C24 no longer exists. at org.netbeans.mdr.handlers.BaseObjectHandler._getDelegate(Bas eObjectHandler.java:322) at org.netbeans.mdr.handlers.InstanceHandler.getInstanceDelegate (InstanceHandler.java:48) at org.netbeans.mdr.handlers.InstanceHandler.refClass(InstanceHa ndler.java:283) at org.netbeans.mdr.util.EventNotifier$Instance.collectListeners(Eve ntNotifier.java:560) at org.netbeans.mdr.util.EventNotifier$Abstract.firePlannedChange( EventNotifier.java:409) at org.netbeans.mdr.handlers.InstanceHandler.refDelete(InstanceH andler.java:304) at org.netbeans.modules.javacore.scanning.JavaUpdater.makeIndex (JavaUpdater.java:239) at org.netbeans.modules.javacore.scanning.JavaUpdater.computeIn dex(JavaUpdater.java:58) at org.netbeans.modules.javacore.jmiimpl.javamodel.ResourceImpl. directUpdate(ResourceImpl.java:537) at org.netbeans.modules.javacore.jmiimpl.javamodel.ResourceImpl. checkUpToDate(ResourceImpl.java:480) at org.netbeans.modules.javacore.jmiimpl.javamodel.ResourceImpl. updateFromDataObject(ResourceImpl.java:386) at org.netbeans.modules.javacore.ExclusiveMutex.parseIfNeeded(E xclusiveMutex.java:218) at org.netbeans.modules.javacore.ExclusiveMutex.enter(ExclusiveM utex.java:137) at org.netbeans.mdr.NBMDRepositoryImpl.beginTrans(NBMDReposi toryImpl.java:227) at org.netbeans.modules.java.JavaEditor$2.run(JavaEditor.java:230) at org.openide.util.Task.run(Task.java:136) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.ja va:330) [catch] at org.openide.util.RequestProcessor$Processor.run(RequestProces sor.java:686)
*** This issue has been marked as a duplicate of 49401 ***