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Installed 7/21 dev build. Opened existing project. Double clicked existing form design: java.lang.ClassNotFoundException: org.netbeans.modules.form.palette.PaletteTopComponent$ResolvableHelper at org.netbeans.ProxyClassLoader.loadClass(ProxyClassLoader.java:149) at java.lang.ClassLoader.loadClass(ClassLoader.java:251) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:242) at org.netbeans.modules.settings.convertors.XMLSettingsSupport$SpecialObjectInputStream.resolveClass(XMLSettings Support.java:174) at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1538) at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1460) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1693) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:339) at org.netbeans.modules.settings.convertors.XMLSettingsSupport$SettingsRecognizer.readSerial(XMLSettingsSupport. java:514) at org.netbeans.modules.settings.convertors.XMLSettingsSupport$SettingsRecognizer.instanceCreate(XMLSettingsSupp ort.java:542) at org.netbeans.modules.settings.convertors.SerialDataConvertor$SettingsInstance.instanceCreate(SerialDataConver tor.java:357) [catch] at org.netbeans.core.windows.persistence.PersistenceManager.getTopComponentPersistentForID(PersistenceManager.ja va:428) at org.netbeans.core.windows.persistence.PersistenceManager.getTopComponentForID(PersistenceManager.java:535) at org.netbeans.core.windows.PersistenceHandler.getTopComponentForID(PersistenceHandler.java:352) at org.netbeans.core.windows.WindowManagerImpl.getTopComponentForID(WindowManagerImpl.java:731) at org.netbeans.core.windows.model.DefaultTopComponentGroupModel.getTopComponent(DefaultTopComponentGroupModel.j ava:257) at org.netbeans.core.windows.model.DefaultTopComponentGroupModel.getTopComponents(DefaultTopComponentGroupModel. java:112) at org.netbeans.core.windows.model.DefaultModel.getGroupTopComponents(DefaultModel.java:788) at org.netbeans.core.windows.Central.getGroupTopComponents(Central.java:1187) at org.netbeans.core.windows.TopComponentGroupImpl.getTopComponents(TopComponentGroupImpl.java:57) at org.netbeans.core.windows.Central.openGroup(Central.java:847) at org.netbeans.core.windows.TopComponentGroupImpl.open(TopComponentGroupImpl.java:47) at org.netbeans.modules.form.FormEditorSupport.checkFormGroupVisibility(FormEditorSupport.java:568) at org.netbeans.modules.form.FormDesigner.componentShowing(FormDesigner.java:1184) at org.netbeans.core.multiview.MultiViewPeer.peerComponentShowing(MultiViewPeer.java:162) at org.netbeans.core.multiview.MultiViewCloneableTopComponent.componentShowing(MultiViewCloneableTopComponent.ja va:107)
Created attachment 23249 [details] IDE log
Note attached log also shows: * org.openide.util.TopologicalSortException * java.lang.reflect.UndeclaredThrowableException * java.lang.AssertionError * java.lang.IllegalStateException: cannot map class member to source hierarchy element
*** Issue 61433 has been marked as a duplicate of this issue. ***
The CNFE was caused by changing the palette implementation. Since the window system settings won't be moved between NB 4.1 and 5.0 by the import utility this problem should not occur (happened only between dev builds). So we won't fix it. org.openide.util.TopologicalSortException is due to some sorting conflicts I have no idea about (not related to form editor). The other exceptions seem to be related to form change (renaming) invoked from non-AWT thread -- this was alredy fixed time ago. So closing this issue.
*** Issue 66665 has been marked as a duplicate of this issue. ***
*** Issue 67791 has been marked as a duplicate of this issue. ***