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Create a form with CradLayout Create two tabs in the form and put a Panel into each of them Put JLabels into these panels. Switch the Card property of CardLayout to point to the second card. Save the form. The exception should be thrown: java.lang.ClassCastException: java.lang.String at com.netbeans.developer.modules.loaders.form.GandalfPersistenceManager .saveLayout(GandalfPersistenceManager.java:730) at com.netbeans.developer.modules.loaders.form.GandalfPersistenceManager .saveContainer(GandalfPersistenceManager.java:673) at com.netbeans.developer.modules.loaders.form.GandalfPersistenceManager .saveForm(GandalfPersistenceManager.java:654) at com.netbeans.developer.modules.loaders.form.FormEditorSupport.saveFor m(FormEditorSupport.java:412) at com.netbeans.developer.modules.loaders.form.FormEditorSupport.saveDoc ument(FormEditorSupport.java:396) at org.openide.text.EditorSupport$SavingManager.save(EditorSupport.java: 1399) at org.openide.actions.SaveAction.performAction(SaveAction.java:47) at org.openide.util.actions.NodeAction.performAction(NodeAction.java:89) at org.openide.util.actions.NodeAction.actionPerformed(NodeAction.java:8 0) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:14 50) at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(Abstra ctButton.java:1504) ... [pbuzek] if problem still persists please attach the form
Bug assigned to the module owner.