java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at oracle.tip.adapter.db.ox.AttributeHolder.toString(AttributeHolder.java:82)
at java.lang.String.valueOf(String.java:2826)
at org.eclipse.persistence.exceptions.DescriptorException.illegalArgumentWhileSettingValueThruMethodAccessor(DescriptorException.java:691)
at org.eclipse.persistence.internal.descriptors.MethodAttributeAccessor.setAttributeValueInObject(MethodAttributeAccessor.java:248)
at org.eclipse.persistence.internal.descriptors.MethodAttributeAccessor.setAttributeValueInObject(MethodAttributeAccessor.java:201)
at org.eclipse.persistence.oxm.mappings.XMLDirectMapping.setAttributeValueInObject(XMLDirectMapping.java:386)
at org.eclipse.persistence.mappings.DatabaseMapping.readFromRowIntoObject(DatabaseMapping.java:1284)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildAttributesIntoObject(ObjectBuilder.java:342)
at org.eclipse.persistence.internal.oxm.XMLObjectBuilder.buildAttributesIntoObject(XMLObjectBuilder.java:376)
at org.eclipse.persistence.internal.oxm.XMLObjectBuilder.buildObject(XMLObjectBuilder.java:286)
at org.eclipse.persistence.oxm.mappings.XMLCompositeObjectMapping.buildCompositeObject(XMLCompositeObjectMapping.java:435)
at org.eclipse.persistence.oxm.mappings.XMLCompositeObjectMapping.valueFromRow(XMLCompositeObjectMapping.java:540)
at org.eclipse.persistence.oxm.mappings.XMLCompositeObjectMapping.readFromRowIntoObject(XMLCompositeObjectMapping.java:464)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildAttributesIntoObject(ObjectBuilder.java:342)
at org.eclipse.persistence.internal.oxm.XMLObjectBuilder.buildAttributesIntoObject(XMLObjectBuilder.java:376)
at org.eclipse.persistence.internal.oxm.XMLObjectBuilder.buildObject(XMLObjectBuilder.java:286)
at org.eclipse.persistence.internal.oxm.record.DOMUnmarshaller.xmlToObject(DOMUnmarshaller.java:427)
at org.eclipse.persistence.internal.oxm.record.DOMUnmarshaller.xmlToObject(DOMUnmarshaller.java:354)
at org.eclipse.persistence.internal.oxm.record.DOMUnmarshaller.unmarshal(DOMUnmarshaller.java:208)
at org.eclipse.persistence.oxm.XMLUnmarshaller.unmarshal(XMLUnmarshaller.java:476)
at org.eclipse.persistence.sessions.factories.XMLProjectReader.readObjectPersistenceRuntimeFormat(XMLProjectReader.java:287)
at org.eclipse.persistence.sessions.factories.XMLProjectReader.read(XMLProjectReader.java:180)
at oracle.tip.tools.ide.adapters.designtime.adapter.xr.XRAdapterUtil.readTopLinkProjectFiles(XRAdapterUtil.java:492)
at oracle.tip.tools.ide.adapters.designtime.adapter.xr.XRAdapterSelectTablesPage.(XRAdapterSelectTablesPage.java:122)
at oracle.tip.tools.ide.adapters.designtime.adapter.xr.XRAdapterOperationPage$ReAddPagesRunnable.run(XRAdapterOperationPage.java:844)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:178)
at java.awt.Dialog$1.run(Dialog.java:1046)
at java.awt.Dialog$3.run(Dialog.java:1098)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Dialog.show(Dialog.java:1096)
at java.awt.Component.show(Component.java:1563)
at java.awt.Component.setVisible(Component.java:1515)
at java.awt.Window.setVisible(Window.java:842)
at java.awt.Dialog.setVisible(Dialog.java:986)
at oracle.bali.ewt.wizard.WizardDialog.runDialog(WizardDialog.java:382)
at oracle.bali.ewt.wizard.WizardDialog.runDialog(WizardDialog.java:298)
at oracle.tip.tools.ide.adapters.designtime.adapter.techAdapterWizard.display(techAdapterWizard.java:362)

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