java.lang.NullPointerException
   at org.netbeans.api.java.source.SourceUtils.getDependentRootsImpl(SourceUtils.java:728)
   at org.netbeans.api.java.source.SourceUtils.getDependentRoots(SourceUtils.java:717)
   at org.netbeans.modules.debugger.jpda.projects.MainProjectManager.isDependent(MainProjectManager.java:163)
   at org.netbeans.modules.debugger.jpda.projects.MainProjectManager.getMainProject(MainProjectManager.java:112)
   at org.netbeans.modules.debugger.jpda.projects.StepIntoActionProvider.shouldBeEnabled(StepIntoActionProvider.java:144)
   at org.netbeans.modules.debugger.jpda.projects.StepIntoActionProvider.access$200(StepIntoActionProvider.java:73)
   at org.netbeans.modules.debugger.jpda.projects.StepIntoActionProvider$Listener.doSetEnabled(StepIntoActionProvider.java:194)
   at org.netbeans.modules.debugger.jpda.projects.StepIntoActionProvider$Listener.propertyChange(StepIntoActionProvider.java:171)
   at org.openide.util.WeakListenerImpl$PropertyChange.propertyChange(WeakListenerImpl.java:188)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
   at org.netbeans.modules.debugger.jpda.projects.MainProjectManager.enable(MainProjectManager.java:147)
   at org.netbeans.modules.project.ui.actions.ProjectAction.refresh(ProjectAction.java:144)
   at org.netbeans.modules.project.ui.actions.LookupSensitiveAction.doRefresh(LookupSensitiveAction.java:189)
   at org.netbeans.modules.project.ui.actions.LookupSensitiveAction.run(LookupSensitiveAction.java:222)
   at org.netbeans.modules.project.ui.actions.ProjectAction.run(ProjectAction.java:62)
   at org.openide.util.Mutex.doEvent(Mutex.java:1335)
   at org.openide.util.Mutex.readAccess(Mutex.java:345)
   at org.netbeans.modules.project.ui.actions.LookupSensitiveAction.resultChanged(LookupSensitiveAction.java:217)
   at org.netbeans.modules.project.ui.actions.ProjectAction.resultChanged(ProjectAction.java:62)
Caused: java.lang.reflect.InvocationTargetException
   at sun.reflect.GeneratedMethodAccessor59.invoke(GeneratedMethodAccessor59.java:0)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   at java.lang.reflect.Method.invoke(Method.java:597)
   at org.openide.util.WeakListenerImpl$ProxyListener.invoke(WeakListenerImpl.java:451)
Caused: java.lang.reflect.UndeclaredThrowableException
   at $Proxy2.resultChanged(.java:0)
   at org.openide.util.lookup.ProxyLookup$1Notify.run(ProxyLookup.java:173)
   at org.openide.util.lookup.ProxyLookup.setLookups(ProxyLookup.java:179)
   at org.openide.util.lookup.ProxyLookup.setLookups(ProxyLookup.java:119)
   at org.netbeans.modules.project.ui.actions.LookupSensitiveAction$LastActivatedWindowLookup.updateLookups(LookupSensitiveAction.java:279)
   at org.netbeans.modules.project.ui.actions.LookupSensitiveAction$LastActivatedWindowLookup.propertyChange(LookupSensitiveAction.java:284)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
   at org.netbeans.core.windows.RegistryImpl.tryFireChanges(RegistryImpl.java:301)
   at org.netbeans.core.windows.RegistryImpl.selectedNodesChanged(RegistryImpl.java:236)
   at org.netbeans.core.windows.WindowManagerImpl.notifyRegistrySelectedNodesChanged(WindowManagerImpl.java:1013)
   at org.netbeans.core.windows.WindowManagerImpl.topComponentActivatedNodesChanged(WindowManagerImpl.java:1196)
   at org.openide.windows.TopComponent.setActivatedNodesImpl(TopComponent.java:364)
   at org.openide.windows.TopComponent.access$400(TopComponent.java:114)
   at org.openide.windows.TopComponent$SynchronizeNodes.run(TopComponent.java:1646)
   at org.openide.windows.TopComponent$SynchronizeNodes.resultChanged(TopComponent.java:1628)
   at org.openide.util.lookup.ProxyLookup$1Notify.run(ProxyLookup.java:173)
   at org.openide.util.lookup.ProxyLookup.setLookups(ProxyLookup.java:179)
   at org.openide.util.lookup.ProxyLookup.setLookups(ProxyLookup.java:119)
   at org.openide.explorer.DefaultEMLookup.updateLookups(DefaultEMLookup.java:131)
   at org.openide.explorer.DefaultEMLookup.propertyChange(DefaultEMLookup.java:163)
   at org.openide.util.WeakListenerImpl$PropertyChange.propertyChange(WeakListenerImpl.java:188)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
   at org.openide.explorer.ExplorerManager$2.run(ExplorerManager.java:865)
   at org.openide.util.Mutex.doEvent(Mutex.java:1335)
   at org.openide.util.Mutex.readAccess(Mutex.java:345)
   at org.openide.explorer.ExplorerManager.fireInAWT(ExplorerManager.java:862)
   at org.openide.explorer.ExplorerManager$1AtomicSetSelectedNodes.fire(ExplorerManager.java:282)
   at org.openide.explorer.ExplorerManager.setSelectedNodes(ExplorerManager.java:293)
   at org.openide.explorer.ExplorerManager$1SetExploredContextAndSelection.run(ExplorerManager.java:381)
   at org.openide.util.Mutex.readAccess(Mutex.java:362)
   at org.openide.util.Mutex$1R.run(Mutex.java:1301)
   at org.openide.util.Mutex.doWrapperAccess(Mutex.java:1318)
   at org.openide.util.Mutex.readAccess(Mutex.java:351)
   at org.openide.explorer.ExplorerManager.setExploredContextAndSelection(ExplorerManager.java:408)
   at org.openide.explorer.view.BeanTreeView.selectionChanged(BeanTreeView.java:143)
   at org.openide.explorer.view.TreeView.callSelectionChanged(TreeView.java:806)
   at org.openide.explorer.view.TreeView$TreePropertyListener.run(TreeView.java:1419)
   at org.openide.util.Mutex$1Exec.run(Mutex.java:1239)
   at org.openide.nodes.Children$ProjectManagerDeadlockDetector.execute(Children.java:1812)
   at org.openide.util.Mutex.postRequest(Mutex.java:1245)
   at org.openide.util.Mutex.postRequest(Mutex.java:1209)
   at org.openide.util.Mutex.postReadRequest(Mutex.java:565)
   at org.openide.explorer.view.TreeView$TreePropertyListener.valueChanged(TreeView.java:1389)
   at javax.swing.tree.DefaultTreeSelectionModel.fireValueChanged(DefaultTreeSelectionModel.java:629)
   at javax.swing.tree.DefaultTreeSelectionModel.notifyPathChange(DefaultTreeSelectionModel.java:1078)
   at javax.swing.tree.DefaultTreeSelectionModel.setSelectionPaths(DefaultTreeSelectionModel.java:287)
   at javax.swing.JTree.setSelectionPaths(JTree.java:1611)
   at javax.swing.JTree.setSelectionRows(JTree.java:1684)
   at javax.swing.JTree.setSelectionRow(JTree.java:1659)
   at org.openide.explorer.view.TreeView$PopupAdapter.showPopup(TreeView.java:1473)
   at org.openide.awt.MouseUtils$PopupMouseAdapter.maybePopup(MouseUtils.java:186)
   at org.openide.awt.MouseUtils$PopupMouseAdapter.mouseReleased(MouseUtils.java:181)
   at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:273)
   at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:272)
   at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:272)
   at java.awt.Component.processMouseEvent(Component.java:6263)
   at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
   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(LightweightDispatcher.java:4574)
   at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4238)
   at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4168)
   at java.awt.Container.dispatchEventImpl(Container.java:2085)
   at java.awt.Window.dispatchEventImpl(Window.java:2478)
   at java.awt.Component.dispatchEvent(Component.java:4460)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:125)
   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)