java.lang.NullPointerException
        at org.netbeans.modules.j2ee.appengine.util.AppEnginePluginProperties.addJars(AppEnginePluginProperties.java:120)
        at org.netbeans.modules.j2ee.appengine.util.AppEnginePluginProperties.getClasses(AppEnginePluginProperties.java:85)
        at org.netbeans.modules.j2ee.appengine.customizer.AppEngineCustomizerDataSupport.init(AppEngineCustomizerDataSupport.java:59)
        at org.netbeans.modules.j2ee.appengine.customizer.AppEngineCustomizerDataSupport.<init>(AppEngineCustomizerDataSupport.java:51)
        at org.netbeans.modules.j2ee.appengine.nodes.AppEngineManagerNode.getCustomizer(AppEngineManagerNode.java:72)
        at org.openide.nodes.FilterNode.getCustomizer(FilterNode.java:815)
        at org.netbeans.modules.j2ee.deployment.impl.bridge.BridgingServerInstance.getCustomizer(BridgingServerInstance.java:117)
        at org.netbeans.api.server.ServerInstance.getCustomizer(ServerInstance.java:122)
        at org.netbeans.modules.server.ui.manager.ServerManagerPanel.selectServer(ServerManagerPanel.java:344)
        at org.netbeans.modules.server.ui.manager.ServerManagerPanel.propertyChange(ServerManagerPanel.java:120)
        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.netbeans.modules.server.ui.manager.ServerManagerPanel.expandAllNodes(ServerManagerPanel.java:411)
        at org.netbeans.modules.server.ui.manager.ServerManagerPanel.expandAllNodes(ServerManagerPanel.java:419)
        at org.netbeans.modules.server.ui.manager.ServerManagerPanel.expandServers(ServerManagerPanel.java:390)
        at org.netbeans.modules.server.ui.manager.ServerManagerPanel.addNotify(ServerManagerPanel.java:111)
        at java.awt.Container.addNotify(Container.java:2578)
        at javax.swing.JComponent.addNotify(JComponent.java:4685)
        at java.awt.Container.addNotify(Container.java:2578)
        at javax.swing.JComponent.addNotify(JComponent.java:4685)
        at java.awt.Container.addNotify(Container.java:2578)
        at javax.swing.JComponent.addNotify(JComponent.java:4685)
        at javax.swing.JRootPane.addNotify(JRootPane.java:739)
        at java.awt.Container.addNotify(Container.java:2578)
        at java.awt.Window.addNotify(Window.java:662)
        at java.awt.Dialog.addNotify(Dialog.java:742)
        at org.netbeans.core.windows.services.NbPresenter.addNotify(NbPresenter.java:427)
        at java.awt.Window.pack(Window.java:703)
        at org.netbeans.core.windows.services.NbPresenter.initialize(NbPresenter.java:251)
        at org.netbeans.core.windows.services.NbPresenter.<init>(NbPresenter.java:181)
        at org.netbeans.core.windows.services.NbDialog.<init>(NbDialog.java:64)
        at org.netbeans.core.windows.services.DialogDisplayerImpl$1.run(DialogDisplayerImpl.java:132)
        at org.netbeans.core.windows.services.DialogDisplayerImpl$1.run(DialogDisplayerImpl.java:107)
        at org.openide.util.Mutex.doEventAccess(Mutex.java:1355)
        at org.openide.util.Mutex.readAccess(Mutex.java:268)
        at org.netbeans.core.windows.services.DialogDisplayerImpl.createDialog(DialogDisplayerImpl.java:107)
        at org.netbeans.api.server.CommonServerUIs.showCustomizer(CommonServerUIs.java:88)
        at org.netbeans.modules.server.ui.manager.ServerManagerAction.actionPerformed(ServerManagerAction.java:48)
        at org.openide.awt.AlwaysEnabledAction$1.run(AlwaysEnabledAction.java:121)
        at org.netbeans.modules.openide.util.ActionsBridge.implPerformAction(ActionsBridge.java:83)
        at org.netbeans.modules.openide.util.ActionsBridge.doPerformAction(ActionsBridge.java:67)
        at org.openide.awt.AlwaysEnabledAction.actionPerformed(AlwaysEnabledAction.java:124)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
        at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
        at javax.swing.AbstractButton.doClick(AbstractButton.java:357)
        at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1225)
        at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1266)
        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:2475)
        at java.awt.Component.dispatchEvent(Component.java:4460)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:117)
        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)