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I quit the IDE. On restart, I see a java.exe and two nbexec.exe running but my IDE does not show up. Workaround is to delete the userdir and restart. This is what the log file has to say: java.util.ConcurrentModificationException at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:449) at java.util.AbstractList$Itr.next(AbstractList.java:420) at org.netbeans.modules.javacore.jmiimpl.javamodel.LightAttrList$LightAttrListIterator.next(LightAttrList.java:444) at org.netbeans.modules.javacore.jmiimpl.javamodel.FeaturesList$FeatureListIterator.next(FeaturesList.java:465) at org.netbeans.modules.java.bridge.ObjectsCollection.getElements(ObjectsCollection.java:109) at org.netbeans.modules.java.bridge.MethodsCollection.getMethods(MethodsCollection.java:76) at org.netbeans.modules.java.bridge.ClassElementImpl.getMethods(ClassElementImpl.java:565) at org.openide.src.ClassElement.getMethods(ClassElement.java:485) at org.openide.src.ClassElement.hasMainMethod(ClassElement.java:802) at org.netbeans.modules.jemmysupport.runinternally.RunInternallyAction.getSelectedMainClass(RunInternallyAction.java:193) at org.netbeans.modules.jemmysupport.runinternally.RunInternallyAction.enable(RunInternallyAction.java:88) at org.openide.util.actions.NodeAction.isEnabled(NodeAction.java:133) at org.openide.awt.Actions$ButtonBridge.updateState(Actions.java:519) at org.openide.awt.Actions$Bridge.addNotify(Actions.java:329) at org.openide.awt.Actions$Bridge$VisL.propertyChange(Actions.java:363) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:333) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:270) at java.awt.Component.firePropertyChange(Component.java:7159) at javax.swing.JComponent.addNotify(JComponent.java:4437) at java.awt.Container.addNotify(Container.java:2500) at javax.swing.JComponent.addNotify(JComponent.java:4436) at org.openide.awt.Toolbar.addNotify(Toolbar.java:486) at java.awt.Container.addNotify(Container.java:2500) at javax.swing.JComponent.addNotify(JComponent.java:4436) at java.awt.Container.addNotify(Container.java:2500) at javax.swing.JComponent.addNotify(JComponent.java:4436) at org.openide.awt.ToolbarPool.addNotify(ToolbarPool.java:137) at java.awt.Container.addNotify(Container.java:2500) at javax.swing.JComponent.addNotify(JComponent.java:4436) at java.awt.Container.addNotify(Container.java:2500) at javax.swing.JComponent.addNotify(JComponent.java:4436) at java.awt.Container.addNotify(Container.java:2500) at javax.swing.JComponent.addNotify(JComponent.java:4436) at javax.swing.JRootPane.addNotify(JRootPane.java:680) at java.awt.Container.addNotify(Container.java:2500) at java.awt.Window.addNotify(Window.java:466) at java.awt.Frame.addNotify(Frame.java:501) at java.awt.Window.show(Window.java:513) at java.awt.Component.show(Component.java:1300) at java.awt.Component.setVisible(Component.java:1253) at org.netbeans.core.windows.view.ui.MainWindow.setVisible(MainWindow.java:542) at org.netbeans.core.windows.view.DefaultView.showWindowSystem(DefaultView.java:514) at org.netbeans.core.windows.view.DefaultView.windowSystemVisibilityChanged(DefaultView.java:467) at org.netbeans.core.windows.view.DefaultView.changeGUI(DefaultView.java:151) at org.netbeans.core.windows.ViewRequestor.dispatchRequest(ViewRequestor.java:238) at org.netbeans.core.windows.ViewRequestor.processVisibilityRequest(ViewRequestor.java:227) at org.netbeans.core.windows.ViewRequestor.postVisibilityRequest(ViewRequestor.java:164) at org.netbeans.core.windows.ViewRequestor.scheduleRequest(ViewRequestor.java:85) at org.netbeans.core.windows.Central.setVisible(Central.java:74) at org.netbeans.core.windows.WindowManagerImpl.setVisible(WindowManagerImpl.java:710) at org.netbeans.core.windows.WindowSystemImpl.show(WindowSystemImpl.java:56) at org.netbeans.core.Main$3.run(Main.java:269) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209) at java.awt.EventQueue.dispatchEvent(EventQueue.java:461) [catch] at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149) at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
Deleting the MDR cache also solves this problem. More specifically I just removed .netbeans\4.1\var\cache\mdrstorage\org-netbeans-java directory and IDE shows up.
We need steps how to reproduce it. Also please attach while ide.log not just exception stack trace.
samaresh, are you able to provide requested information?
Closing as WORKSFORME, reporter is not able to provide details about the issue. Please create new issue if you can reproduce.
Reorganization of java component