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This exception has no message.
java.util.NoSuchElementException: 	at java.util.ArrayList$Itr.next(ArrayList.java:854)	at org.eclipse.persistence.internal.jpa.metadata.MetadataDescriptor.getPrimaryKeyField(MetadataDescriptor.java:1048)	at org.eclipse.persistence.internal.jpa.metadata.accessors.MetadataAccessor.getReferencedField(MetadataAccessor.java:442)	at org.eclipse.persistence.internal.jpa.metadata.accessors.MetadataAccessor.getReferencedField(MetadataAccessor.java:430)	at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.EntityAccessor.addMultipleTableKeyFields(EntityAccessor.java:231)	at org.netbeans.jpa.modeler.db.accessor.EntitySpecAccessor.addMultipleTableKeyFields(EntitySpecAccessor.java:112)	at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.EntityAccessor.processInheritancePrimaryKeyJoinColumns(EntityAccessor.java:1183)	at org.eclipse.persistence.internal.jpa.metadata.inheritance.InheritanceMetadata.processInheritanceRoot(InheritanceMetadata.java:265)	at org.eclipse.persistence.internal.jpa.metadata.inheritance.InheritanceMetadata.process(InheritanceMetadata.java:230)	at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.EntityAccessor.processInheritance(EntityAccessor.java:1144)	at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.EntityAccessor.processTableAndInheritance(EntityAccessor.java:1385)	at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.EntityAccessor.process(EntityAccessor.java:683)	at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.EntityAccessor.process(EntityAccessor.java:678)	at org.eclipse.persistence.internal.jpa.metadata.MetadataProject.processStage2(MetadataProject.java:1808)	at org.eclipse.persistence.internal.jpa.metadata.MetadataProcessor.processORMMetadata(MetadataProcessor.java:573)	at org.netbeans.db.modeler.persistence.internal.jpa.deployment.JPAMPersistenceUnitProcessor.processORMetadata(JPAMPersistenceUnitProcessor.java:49)	at org.netbeans.db.modeler.specification.model.util.DBModelerUtil.createDBMapping(DBModelerUtil.java:255)	at org.netbeans.db.modeler.specification.model.util.DBModelerUtil.loadModelerFileInternal(DBModelerUtil.java:193)	at org.netbeans.db.modeler.specification.model.util.DBModelerUtil.loadModelerFile(DBModelerUtil.java:178)	at org.netbeans.modeler.core.NBModelerUtil.loadModelerFile(NBModelerUtil.java:57)	at org.netbeans.modeler.specification.model.file.action.ModelerFileActionListener.openModelerFile(ModelerFileActionListener.java:143)	at org.netbeans.db.modeler.specification.model.file.action.DBViewerActionListener.init(DBViewerActionListener.java:58)	at org.netbeans.jpa.modeler.specification.model.util.JPAModelerUtil.openDBViewer(JPAModelerUtil.java:1566)	at org.netbeans.jpa.modeler.listener.ShortcutListener.keyPressed(ShortcutListener.java:43)	at java.awt.AWTEventMulticaster.keyPressed(AWTEventMulticaster.java:249)	at java.awt.Component.processKeyEvent(Component.java:6493)	at javax.swing.JComponent.processKeyEvent(JComponent.java:2832)	at java.awt.Component.processEvent(Component.java:6312)	at java.awt.Container.processEvent(Container.java:2236)	at java.awt.Component.dispatchEventImpl(Component.java:4891)	at java.awt.Container.dispatchEventImpl(Container.java:2294)	at java.awt.Component.dispatchEvent(Component.java:4713)	at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1954)	at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:806)	at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:1074)	at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:945)	at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:771)	at java.awt.Component.dispatchEventImpl(Component.java:4762)	at java.awt.Container.dispatchEventImpl(Container.java:2294)	at java.awt.Window.dispatchEventImpl(Window.java:2750)	at java.awt.Component.dispatchEvent(Component.java:4713)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)	at java.awt.EventQueue.access$500(EventQueue.java:97)	at java.awt.EventQueue$3.run(EventQueue.java:709)	at java.awt.EventQueue$3.run(EventQueue.java:703)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)	at java.awt.EventQueue$4.run(EventQueue.java:731)	at java.awt.EventQueue$4.run(EventQueue.java:729)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)	at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)