java.lang.NoClassDefFoundError: org/netbeans/spi/server/ServerInstance
        at java.lang.ClassLoader.defineClass1(ClassLoader.java:0)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
        at org.netbeans.JarClassLoader.doLoadClass(JarClassLoader.java:254)
        at org.netbeans.ProxyClassLoader.selfLoadClass(ProxyClassLoader.java:245)
        at org.netbeans.ProxyClassLoader.loadClass(ProxyClassLoader.java:219)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
        at org.netbeans.modules.j2ee.deployment.impl.bridge.BridgingServerInstanceProvider.refreshCache(BridgingServerInstanceProvider.java:143)
        at org.netbeans.modules.j2ee.deployment.impl.bridge.BridgingServerInstanceProvider.getInstances(BridgingServerInstanceProvider.java:106)
        at org.netbeans.modules.server.ui.manager.ServerManagerPanel$ServersChildren.createKeys(ServerManagerPanel.java:525)
        at org.openide.nodes.SynchChildren.refresh(SynchChildren.java:82)
        at org.openide.nodes.SynchChildren.addNotify(SynchChildren.java:67)
        at org.openide.nodes.Children.callAddNotify(Children.java:541)
        at org.openide.nodes.Children.getArray(Children.java:583)
        at org.openide.nodes.Children.getNodes(Children.java:422)
        at org.openide.explorer.view.VisualizerNode.getChildren(VisualizerNode.java:244)
        at org.openide.explorer.view.VisualizerNode.getChildCount(VisualizerNode.java:290)
        at javax.swing.tree.DefaultTreeModel.getChildCount(DefaultTreeModel.java:168)
        at javax.swing.tree.VariableHeightLayoutCache$TreeStateNode.expand(VariableHeightLayoutCache.java:1461)
        at javax.swing.tree.VariableHeightLayoutCache$TreeStateNode.expand(VariableHeightLayoutCache.java:1270)
        at javax.swing.tree.VariableHeightLayoutCache.rebuild(VariableHeightLayoutCache.java:725)
        at javax.swing.tree.VariableHeightLayoutCache.treeStructureChanged(VariableHeightLayoutCache.java:626)
        at javax.swing.plaf.basic.BasicTreeUI$Handler.treeStructureChanged(BasicTreeUI.java:3721)
        at javax.swing.tree.DefaultTreeModel.fireTreeStructureChanged(DefaultTreeModel.java:559)
        at javax.swing.tree.DefaultTreeModel.nodeStructureChanged(DefaultTreeModel.java:345)
        at javax.swing.tree.DefaultTreeModel.setRoot(DefaultTreeModel.java:117)
        at org.openide.explorer.view.NodeTreeModel$1.run(NodeTreeModel.java:106)
        at org.openide.util.Mutex.doEvent(Mutex.java:1335)
        at org.openide.util.Mutex.readAccess(Mutex.java:345)
        at org.openide.explorer.view.NodeTreeModel.setNode(NodeTreeModel.java:92)
        at org.openide.explorer.view.TreeView.synchronizeRootContext(TreeView.java:764)
        at org.openide.explorer.view.TreeView.lookupExplorerManager(TreeView.java:606)
        at org.openide.explorer.view.TreeView.addNotify(TreeView.java:586)
        at java.awt.Container.addNotify(Container.java:2500)
        at javax.swing.JComponent.addNotify(JComponent.java:4478)
        at org.netbeans.modules.server.ui.manager.ServerManagerPanel.addNotify(ServerManagerPanel.java:109)
        at java.awt.Container.addNotify(Container.java:2500)
        at javax.swing.JComponent.addNotify(JComponent.java:4478)
        at java.awt.Container.addNotify(Container.java:2500)
        at javax.swing.JComponent.addNotify(JComponent.java:4478)
        at java.awt.Container.addNotify(Container.java:2500)
        at javax.swing.JComponent.addNotify(JComponent.java:4478)
        at javax.swing.JRootPane.addNotify(JRootPane.java:680)
        at java.awt.Container.addNotify(Container.java:2500)
        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:337)
        at java.awt.Window.pack(Window.java:485)
        at org.netbeans.core.windows.services.NbPresenter.initialize(NbPresenter.java:235)
        at org.netbeans.core.windows.services.NbPresenter.<init>(NbPresenter.java:162)
        at org.netbeans.core.windows.services.NbDialog.<init>(NbDialog.java:64)
        at org.netbeans.core.windows.services.DialogDisplayerImpl$1.run(DialogDisplayerImpl.java:130)
        at org.netbeans.core.windows.services.DialogDisplayerImpl$1.run(DialogDisplayerImpl.java:106)
        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:105)
        at org.netbeans.api.server.CommonServerUIs.showCustomizer(CommonServerUIs.java:88)
        at org.netbeans.modules.server.ui.manager.ServerManagerAction.performAction(ServerManagerAction.java:61)
        at org.openide.util.actions.CallableSystemAction$1.run(CallableSystemAction.java:118)
        at org.netbeans.modules.openide.util.ActionsBridge.doPerformAction(ActionsBridge.java:77)
        at org.openide.util.actions.CallableSystemAction.actionPerformed(CallableSystemAction.java:114)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1849)
        at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2169)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
        at javax.swing.AbstractButton.doClick(AbstractButton.java:302)
        at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1051)
        at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1092)
        at java.awt.Component.processMouseEvent(Component.java:5517)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3135)
        at java.awt.Component.processEvent(Component.java:5282)
        at java.awt.Container.processEvent(Container.java:1966)
        at java.awt.Component.dispatchEventImpl(Component.java:3984)
        at java.awt.Container.dispatchEventImpl(Container.java:2024)
        at java.awt.Component.dispatchEvent(Component.java:3819)
        at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4212)
        at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:3892)
        at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:3822)
        at java.awt.Container.dispatchEventImpl(Container.java:2010)
        at java.awt.Window.dispatchEventImpl(Window.java:1791)
        at java.awt.Component.dispatchEvent(Component.java:3819)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.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)