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Happens to me pretty often with forms that use SwingX widgets: Found one Java-level deadlock: ============================= "AWT-EventQueue-1": waiting to lock monitor 0xaf2b8fa8 (object 0x7e100fd8, a java.lang.Object), which is held by "GUI Builder" "GUI Builder": waiting to lock monitor 0xaf2b75e0 (object 0x8673d500, a java.lang.Class), which is held by "AWT-EventQueue-1" Java stack information for the threads listed above: =================================================== "AWT-EventQueue-1": at java.beans.Introspector.getBeanInfo(Introspector.java:157) - waiting to lock <0x7e100fd8> (a java.lang.Object) at org.jdesktop.swingx.plaf.basic.BasicTitledPanelUI.installProperty(BasicTitledPanelUI.java:272) at org.jdesktop.swingx.plaf.basic.BasicTitledPanelUI.installDefaults(BasicTitledPanelUI.java:142) at org.jdesktop.swingx.plaf.basic.BasicTitledPanelUI.installUI(BasicTitledPanelUI.java:132) at javax.swing.JComponent.setUI(JComponent.java:662) at javax.swing.JPanel.setUI(JPanel.java:136) at org.jdesktop.swingx.JXTitledPanel.setUI(JXTitledPanel.java:151) at org.jdesktop.swingx.JXTitledPanel.updateUI(JXTitledPanel.java:178) at javax.swing.JPanel.<init>(JPanel.java:69) at javax.swing.JPanel.<init>(JPanel.java:92) at javax.swing.JPanel.<init>(JPanel.java:100) at org.jdesktop.swingx.JXPanel.<init>(JXPanel.java:122) at org.jdesktop.swingx.JXTitledPanel.<init>(JXTitledPanel.java:125) at org.jdesktop.swingx.JXTitledPanel.<init>(JXTitledPanel.java:115) at org.jdesktop.swingx.JXTitledPanel.<init>(JXTitledPanel.java:105) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) at java.lang.reflect.Constructor.newInstance(Constructor.java:513) at java.lang.Class.newInstance0(Class.java:355) at java.lang.Class.newInstance(Class.java:308) at org.netbeans.modules.form.CreationFactory.createDefaultInstance(CreationFactory.java:168) at org.netbeans.modules.form.RADComponent.createBeanInstance(RADComponent.java:247) at org.netbeans.modules.form.RADComponent.cloneBeanInstance(RADComponent.java:407) at org.netbeans.modules.form.VisualReplicator.cloneComponent(VisualReplicator.java:693) at org.netbeans.modules.form.VisualReplicator.cloneComponent(VisualReplicator.java:731) at org.netbeans.modules.form.VisualReplicator.createClone(VisualReplicator.java:185) at org.netbeans.modules.form.VisualReplicator.createClone(VisualReplicator.java:173) at org.netbeans.modules.form.FormDesigner$FormListener.run(FormDesigner.java:2357) at org.netbeans.modules.form.FormLAF$3.run(FormLAF.java:329) - locked <0x7e8295b8> (a javax.swing.MultiUIDefaults) - locked <0x8673d500> (a java.lang.Class for java.beans.Introspector) at org.openide.util.Mutex.doEventAccess(Mutex.java:1361) at org.openide.util.Mutex.readAccess(Mutex.java:271) at org.netbeans.modules.form.FormLAF.executeWithLookAndFeel(FormLAF.java:312) at org.netbeans.modules.form.FormDesigner$FormListener.processEvents(FormDesigner.java:2339) at org.netbeans.modules.form.FormDesigner$FormListener.formChanged(FormDesigner.java:2305) at org.netbeans.modules.form.FormDesigner.updateWholeDesigner(FormDesigner.java:548) at org.netbeans.modules.form.FormDesigner.initialize(FormDesigner.java:311) at org.netbeans.modules.form.FormDesigner.finishComponentShowing(FormDesigner.java:1916) at org.netbeans.modules.form.FormDesigner.access$1100(FormDesigner.java:107) at org.netbeans.modules.form.FormDesigner$PreLoadTask$1.run(FormDesigner.java:1862) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209) at java.awt.EventQueue.dispatchEvent(EventQueue.java:597) at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:137) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161) at java.awt.EventDispatchThread.run(EventDispatchThread.java:122) "GUI Builder": at java.beans.Introspector.findExplicitBeanInfo(Introspector.java:426) - waiting to lock <0x8673d500> (a java.lang.Class for java.beans.Introspector) at java.beans.Introspector.<init>(Introspector.java:377) at java.beans.Introspector.getBeanInfo(Introspector.java:164) - locked <0x7e100fd8> (a java.lang.Object) at java.beans.Introspector.getBeanInfo(Introspector.java:227) at java.beans.Introspector.<init>(Introspector.java:386) at java.beans.Introspector.getBeanInfo(Introspector.java:164) - locked <0x7e100fd8> (a java.lang.Object) at java.beans.Introspector.getBeanInfo(Introspector.java:227) at java.beans.Introspector.<init>(Introspector.java:386) at java.beans.Introspector.getBeanInfo(Introspector.java:164) - locked <0x7e100fd8> (a java.lang.Object) at java.beans.Introspector.getBeanInfo(Introspector.java:227) at java.beans.Introspector.<init>(Introspector.java:386) at java.beans.Introspector.getBeanInfo(Introspector.java:164) - locked <0x7e100fd8> (a java.lang.Object) at org.openide.util.Utilities.getBeanInfo(Utilities.java:426) at org.netbeans.modules.form.FormUtils.getBeanInfo(FormUtils.java:1771) at org.netbeans.modules.form.palette.PaletteItem.getBeanDescriptor(PaletteItem.java:296) at org.netbeans.modules.form.palette.PaletteItem.getDisplayName(PaletteItem.java:227) at org.netbeans.modules.form.palette.PaletteItemDataObject$ItemNode.getDisplayName(PaletteItemDataObject.java:323) at org.openide.nodes.FilterNode.getDisplayName(FilterNode.java:533) at org.openide.nodes.FilterNode.getDisplayName(FilterNode.java:533) at org.netbeans.modules.form.palette.PaletteUtils$1.run(PaletteUtils.java:242) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418) at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1957)
Probably a dup of 187697. A JDK 6 regression.
Yes, hmichel is right. It is a duplicate of issue 187697. *** This bug has been marked as a duplicate of bug 187697 ***