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This exception has no message.
java.lang.NullPointerException: 	at kodo.meta.ClassMetaDataImpl.setDetachable(ClassMetaDataImpl.java:521)	at kodo.jdbc.ide.meta.ClassMetaDataComponent.setValues(ClassMetaDataComponent.java:332)	at kodo.jdbc.ide.meta.ClassMetaDataPanel.setValues(ClassMetaDataPanel.java:46)	at kodo.jdbc.ide.meta.editor.MetaDataEditor.save(MetaDataEditor.java:142)	at kodo.jdbc.ide.meta.editor.EditingPane.validateEditors(EditingPane.java:271)	at kodo.jdbc.ide.meta.editor.EditingPane.save(EditingPane.java:237)	at kodo.jdbc.ide.meta.editor.SaveEditorAction.safeActionPerformed(SaveEditorAction.java:39)	at kodo.jdbc.ide.meta.actions.AbstractWorkbenchAction.performAction(AbstractWorkbenchAction.java:162)	at kodo.jdbc.ide.meta.actions.AbstractWorkbenchAction.actionPerformed(AbstractWorkbenchAction.java:109)	at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)	at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(UnknownSource)	at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)	at javax.swing.DefaultButtonModel.setPressed(Unknown Source)	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(UnknownSource)	at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)	at java.awt.Component.processMouseEvent(Unknown Source)	at java.awt.Component.processEvent(Unknown Source)	at java.awt.Container.processEvent(Unknown Source)	at java.awt.Component.dispatchEventImpl(Unknown Source)	at java.awt.Container.dispatchEventImpl(Unknown Source)	at java.awt.Component.dispatchEvent(Unknown Source)	at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)	at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)	at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)	at java.awt.Container.dispatchEventImpl(Unknown Source)	at java.awt.Window.dispatchEventImpl(Unknown Source)	at java.awt.Component.dispatchEvent(Unknown Source)	at java.awt.EventQueue.dispatchEvent(Unknown Source)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.run(Unknown Source)