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Thursday, January 19, 2012

Unexpected error in JDeveloper 11g while creating Applications

I was receiving the unexpected error as mentioned below while creating new Application or opening the existing Applications in JDeveloper and also none of the existing applications are loading.

SEVERE: Exception while updating observer[0]: oracle.bm.commonIde.ProjectObserver@1760aec
java.lang.NullPointerException
at oracle.ide.Ide.getDefaultProject(Ide.java:487)
at oracle.bm.commonIde.ProjectObserver.update(ProjectObserver.java:57)
at oracle.ide.model.IdeSubject.notifyObservers(IdeSubject.java:98)
at oracle.ide.model.Node.notifyObservers(Node.java:786)
at oracle.ide.model.UpdateMessage.firePropertiesChanged(UpdateMessage.java:640)
at oracle.ide.model.ProjectContent$L.projectPropertiesChanged(ProjectContent.java:694)
at oracle.ide.model.Project$StorageListener.structureValuesChanged(Project.java:1097)
at oracle.javatools.data.Structure.fireStructureChangeEvent(Structure.java:455)
at oracle.javatools.data.Structure.firePlaceholderValueAdded(Structure.java:388)
at oracle.javatools.data.Structure.firePlaceholderValueAdded(Structure.java:394)
at oracle.javatools.data.Structure.firePlaceholderValueAdded(Structure.java:394)
at oracle.javatools.data.HashStructure$Impl$3.run(HashStructure.java:1970)
at oracle.javatools.data.HashStructure$Impl.putValueInKeyStruct(HashStructure.java:2021

Also, when I was trying to create new Application the below error was shown in the editor.

I have tried re-installing the JDeveloper also but the same error was repeated again.

As a solution I have deleted the contents of JDeveloper directory after that I am able to create or open the applications in JDev- The location of the JDeveloper can be identified by referring help->about->properties->ide.user.dir)