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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 org.eclipse.persistence.sessions.factories.XMLProjectReader.read(XMLProjectReader.java:236)	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)