java.lang.NullPointerException at java.awt.Container.addNotify(Container.java:2544) at javax.swing.JComponent.addNotify(JComponent.java:4478) at java.awt.Container.addNotify(Container.java:2544) at javax.swing.JComponent.addNotify(JComponent.java:4478) at java.awt.Container.addNotify(Container.java:2544) at javax.swing.JComponent.addNotify(JComponent.java:4478) at javax.swing.JRootPane.addNotify(JRootPane.java:680) at java.awt.Container.addNotify(Container.java:2544) at java.awt.Window.addNotify(Window.java:467) at java.awt.Dialog.addNotify(Dialog.java:379) at org.netbeans.core.windows.services.NbPresenter.addNotify(NbPresenter.java:427) at java.awt.Window.pack(Window.java:485) at org.netbeans.core.windows.services.NbPresenter.initialize(NbPresenter.java:251) at org.netbeans.core.windows.services.NbPresenter.(NbPresenter.java:181) at org.netbeans.core.windows.services.NbDialog.(NbDialog.java:64) at org.netbeans.core.windows.services.DialogDisplayerImpl$1AWTQuery.showDialog(DialogDisplayerImpl.java:206) at org.netbeans.core.windows.services.DialogDisplayerImpl.notify(DialogDisplayerImpl.java:248) at org.netbeans.core.windows.services.DialogDisplayerImpl.notify(DialogDisplayerImpl.java:146) at org.netbeans.modules.maven.nodes.MavenProjectNode$ShowProblemsAction.actionPerformed(MavenProjectNode.java:292) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1882) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2202) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258) at javax.swing.AbstractButton.doClick(AbstractButton.java:334) at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1051) at apple.laf.CUIAquaMenuItem.doClick(CUIAquaMenuItem.java:119) at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1092) at java.awt.Component.processMouseEvent(Component.java:5602) at javax.swing.JComponent.processMouseEvent(JComponent.java:3135) at java.awt.Component.processEvent(Component.java:5367) at java.awt.Container.processEvent(Container.java:2010) at java.awt.Component.dispatchEventImpl(Component.java:4068) at java.awt.Container.dispatchEventImpl(Container.java:2068) at java.awt.Component.dispatchEvent(Component.java:3903) at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4256) at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:3936) at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:3866) at java.awt.Container.dispatchEventImpl(Container.java:2054) at java.awt.Window.dispatchEventImpl(Window.java:1801) at java.awt.Component.dispatchEvent(Component.java:3903) at java.awt.EventQueue.dispatchEvent(EventQueue.java:463) at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104) at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:269) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:184) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:176) at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)