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Scenario: - Create Welcome sample - Delete project ==> 'Projects' tab is empty - Select 'Release' mode on toolbar ==> java.lang.NullPointerException at org.netbeans.modules.cnd.makeproject.MakeProjectConfigurationProvider.setActiveConfiguration(MakeProjectConfigurationProvider.java:84) at org.netbeans.modules.project.ui.actions.ActiveConfigAction$10.run(ActiveConfigAction.java:499) at org.netbeans.modules.project.ui.actions.ActiveConfigAction$10.run(ActiveConfigAction.java:497) at org.openide.util.Mutex.writeAccess(Mutex.java:433) at org.netbeans.modules.project.ui.actions.ActiveConfigAction.setActiveConfiguration(ActiveConfigAction.java:497) at org.netbeans.modules.project.ui.actions.ActiveConfigAction.activeConfigurationSelected(ActiveConfigAction.java:224) at org.netbeans.modules.project.ui.actions.ActiveConfigAction.access$600(ActiveConfigAction.java:90) at org.netbeans.modules.project.ui.actions.ActiveConfigAction$1.actionPerformed(ActiveConfigAction.java:126) at javax.swing.JComboBox.fireActionEvent(JComboBox.java:1240) at javax.swing.JComboBox.setSelectedItem(JComboBox.java:567) at javax.swing.JComboBox.setSelectedIndex(JComboBox.java:603) at javax.swing.plaf.basic.BasicComboPopup$Handler.mouseReleased(BasicComboPopup.java:816) at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:273) at java.awt.Component.processMouseEvent(Component.java:6263) at javax.swing.JComponent.processMouseEvent(JComponent.java:3267) at javax.swing.plaf.basic.BasicComboPopup$1.processMouseEvent(BasicComboPopup.java:480) at java.awt.Component.processEvent(Component.java:6028) at java.awt.Container.processEvent(Container.java:2041) at java.awt.Component.dispatchEventImpl(Component.java:4630) at java.awt.Container.dispatchEventImpl(Container.java:2099) at java.awt.Component.dispatchEvent(Component.java:4460) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4574) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168) at java.awt.Container.dispatchEventImpl(Container.java:2085) at java.awt.Window.dispatchEventImpl(Window.java:2475) at java.awt.Component.dispatchEvent(Component.java:4460) [catch] at java.awt.EventQueue.dispatchEvent(EventQueue.java:599) at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104) 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)
Fixed the NPE. The underlying problem is actually a bug in the NB's project system. The bug appears if you delete (or close) the last open project. If you do, NB's project system keeps the last open project's configurations in the combo box in the toolbar even the project is no longer around (deleted or closed). It should blank out the combobox. Try Java (and probably any other project type) and you will see the same behavior. I fixed the NPE resulting from operating of the deleted project. I also implemented a work-around in case you delete the project. It will now send a notification to the configuration manager so it can blank out the combobox. The same work-around doesn't work when closing the project and the bug should be fixed in NB's project system. I will file the bug.
IZ filed: http://www.netbeans.org/issues/show_bug.cgi?id=167259
Integrated into 'main-golden', will be available in build *200906180201* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main-golden/rev/e9ab78206657 User: Thomas Preisler <thp@netbeans.org> Log: #167246 NullPointerException when user is changing configuration