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This exception has no message.
java.lang.NullPointerException: 	at org.eclipse.wst.common.componentcore.internal.operation.CreateReferenceComponentsOp.validateEdit(CreateReferenceComponentsOp.java:61)	at org.eclipse.wst.common.componentcore.internal.operation.CreateReferenceComponentsOp.execute(CreateReferenceComponentsOp.java:47)	at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelPausibleOperationImpl$1.run(DataModelPausibleOperationImpl.java:376)	at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1800)	at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelPausibleOperationImpl.runOperation(DataModelPausibleOperationImpl.java:401)	at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelPausibleOperationImpl.runOperation(DataModelPausibleOperationImpl.java:352)	at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelPausibleOperationImpl.doExecute(DataModelPausibleOperationImpl.java:242)	at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelPausibleOperationImpl.executeImpl(DataModelPausibleOperationImpl.java:214)	at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelPausibleOperationImpl.cacheThreadAndContinue(DataModelPausibleOperationImpl.java:89)	at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelPausibleOperationImpl.execute(DataModelPausibleOperationImpl.java:202)	at org.eclipse.jst.ws.internal.common.J2EEUtils.addJavaProjectAsUtilityJar(J2EEUtils.java:1633)	at org.eclipse.jst.ws.internal.creation.ui.extension.PreServiceDevelopCommand$1.run(PreServiceDevelopCommand.java:243)	at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)