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To reproduce: o create/build/debug Args sample project o turn off the C/C++ moduel o create/build/debug a Java sample project o turn on the c/C++ module o close the java project o build the Args project o the following exception is thrown: java.lang.reflect.UndeclaredThrowableException at $Proxy9.resultChanged(Unknown Source) at org.openide.util.lookup.SimpleProxyLookup.checkLookup(SimpleProxyLook up.java:85) at org.openide.util.lookup.SimpleProxyLookup.lookup(SimpleProxyLookup.ja va:116) at org.netbeans.modules.openide.windows.GlobalActionContextImpl.property Change(GlobalActionContextImpl.java:96) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSup port.java:333) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSup port.java:270) at org.netbeans.core.windows.RegistryImpl.doFirePropertyChange(RegistryI mpl.java:255) at org.netbeans.core.windows.RegistryImpl.access$100(RegistryImpl.java:4 2) [catch] at org.netbeans.core.windows.RegistryImpl$1.run(RegistryImpl.java:140) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209) at java.awt.EventQueue.dispatchEvent(EventQueue.java:461) at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchTh read.java:242) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre ad.java:163) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149) at java.awt.EventDispatchThread.run(EventDispatchThread.java:110) Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.GeneratedMethodAccessor28.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces sorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.openide.util.WeakListenerImpl$ProxyListener.invoke(WeakListenerIm pl.java:416) ... 16 more Caused by: java.lang.ClassCastException: org.netbeans.modules.cnd.makeproject.ap i.configurations.Item at org.netbeans.modules.cnd.makeproject.MakeActionProvider.getNoteItem(M akeActionProvider.java:544) at org.netbeans.modules.cnd.makeproject.MakeActionProvider.isActionEnabl ed(MakeActionProvider.java:526) at org.netbeans.modules.project.ui.actions.ActionsUtil.commandSupported(ActionsUtil.java:118) at org.netbeans.modules.project.ui.actions.ActionsUtil.getProjectsFromLo okup(ActionsUtil.java:73) at org.netbeans.modules.project.ui.actions.FileCommandAction.refresh(Fil eCommandAction.java:54) at org.netbeans.modules.project.ui.actions.LookupSensitiveAction.doRefre sh(LookupSensitiveAction.java:115) at org.netbeans.modules.project.ui.actions.LookupSensitiveAction.resultC hanged(LookupSensitiveAction.java:141) ==> java.lang.reflect.InvocationTargetException at sun.reflect.GeneratedMethodAccessor28.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces sorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.openide.util.WeakListenerImpl$ProxyListener.invoke(WeakListenerIm pl.java:416) at $Proxy9.resultChanged(Unknown Source) at org.openide.util.lookup.SimpleProxyLookup.checkLookup(SimpleProxyLook up.java:85) at org.openide.util.lookup.SimpleProxyLookup.lookup(SimpleProxyLookup.java:116) at org.netbeans.modules.openide.windows.GlobalActionContextImpl.property Change(GlobalActionContextImpl.java:96) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSup port.java:333) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSup port.java:270) at org.netbeans.core.windows.RegistryImpl.doFirePropertyChange(RegistryI mpl.java:255) at org.netbeans.core.windows.RegistryImpl.access$100(RegistryImpl.java:4 2) [catch] at org.netbeans.core.windows.RegistryImpl$1.run(RegistryImpl.java:140) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209) at java.awt.EventQueue.dispatchEvent(EventQueue.java:461) at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchTh read.java:242) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre ad.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) Caused by: java.lang.ClassCastException: org.netbeans.modules.cnd.makeproject.api.configurations.Item at org.netbeans.modules.cnd.makeproject.MakeActionProvider.getNoteItem(M akeActionProvider.java:544) at org.netbeans.modules.cnd.makeproject.MakeActionProvider.isActionEnabl ed(MakeActionProvider.java:526) at org.netbeans.modules.project.ui.actions.ActionsUtil.commandSupported( ActionsUtil.java:118) at org.netbeans.modules.project.ui.actions.ActionsUtil.getProjectsFromLo okup(ActionsUtil.java:73) at org.netbeans.modules.project.ui.actions.FileCommandAction.refresh(Fil eCommandAction.java:54) at org.netbeans.modules.project.ui.actions.LookupSensitiveAction.doRefre sh(LookupSensitiveAction.java:115) at org.netbeans.modules.project.ui.actions.LookupSensitiveAction.resultC hanged(LookupSensitiveAction.java:141) ... 20 more ==> java.lang.ClassCastException: org.netbeans.modules.cnd.makeproject.api.configura tions.Item at org.netbeans.modules.cnd.makeproject.MakeActionProvider.getNoteItem(M akeActionProvider.java:544) at org.netbeans.modules.cnd.makeproject.MakeActionProvider.isActionEnabled(MakeActionProvider.java:526) at org.netbeans.modules.project.ui.actions.ActionsUtil.commandSupported( ActionsUtil.java:118) at org.netbeans.modules.project.ui.actions.ActionsUtil.getProjectsFromLo okup(ActionsUtil.java:73) at org.netbeans.modules.project.ui.actions.FileCommandAction.refresh(Fil eCommandAction.java:54) at org.netbeans.modules.project.ui.actions.LookupSensitiveAction.doRefre sh(LookupSensitiveAction.java:115) at org.netbeans.modules.project.ui.actions.LookupSensitiveAction.resultC hanged(LookupSensitiveAction.java:141) at sun.reflect.GeneratedMethodAccessor28.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces sorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.openide.util.WeakListenerImpl$ProxyListener.invoke(WeakListenerIm pl.java:416) at $Proxy9.resultChanged(Unknown Source) at org.openide.util.lookup.SimpleProxyLookup.checkLookup(SimpleProxyLook up.java:85) at org.openide.util.lookup.SimpleProxyLookup.lookup(SimpleProxyLookup.ja va:116) at org.netbeans.modules.openide.windows.GlobalActionContextImpl.property Change(GlobalActionContextImpl.java:96) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSup port.java:333) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSup port.java:270) at org.netbeans.core.windows.RegistryImpl.doFirePropertyChange(RegistryI mpl.java:255) at org.netbeans.core.windows.RegistryImpl.access$100(RegistryImpl.java:4 2) [catch] at org.netbeans.core.windows.RegistryImpl$1.run(RegistryImpl.java:140) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209) at java.awt.EventQueue.dispatchEvent(EventQueue.java:461) at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchTh read.java:242) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre ad.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)
Cannot reproduce this anymore with 6.1. Enabling/disabling modules work differently in 6.1 so it is not possible to follow the steps exactly as described but I tried to enable/disable C/C++ and didn't see any exceptions. Will close as WORKSFORME.