[jbosstools-issues] [JBoss JIRA] Created: (JBIDE-4931) 'Preview' button in 'Edit XPath' dialog throws exception

[Denis Golovin (JIRA)]

'Preview' button in 'Edit XPath' dialog throws exception
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                 Key: JBIDE-4931
                 URL: https://jira.jboss.org/jira/browse/JBIDE-4931
             Project: Tools (JBoss Tools)
          Issue Type: Bug
          Components: jmx
    Affects Versions: 3.1.0.M4
            Reporter: Denis Golovin


1. EXECUTE: Create JBoss AS Server and expand XMP COnfiguration/Ports node in JBoss Servre View
2. EXECUTE: Select 'Edit XPath' form popup menu on JBoss Web child node
3. EXECUTE: Press 'Preview'
4. ASSERT: There is no exceptions in Error Log View

now it throws exception showed below

org.eclipse.swt.SWTException: Failed to execute runnable (java.lang.NullPointerException)
	at org.eclipse.swt.SWT.error(SWT.java:3884)
	at org.eclipse.swt.SWT.error(SWT.java:3799)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:137)
	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3468)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3115)
	at org.eclipse.jface.operation.ModalContext$ModalContextThread.block(ModalContext.java:173)
	at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:388)
	at org.eclipse.jface.dialogs.ProgressMonitorDialog.run(ProgressMonitorDialog.java:507)
	at org.jboss.ide.eclipse.as.ui.dialogs.XPathDialogs$XPathDialog.previewPressed(XPathDialogs.java:411)
	at org.jboss.ide.eclipse.as.ui.dialogs.XPathDialogs$XPathDialog$7.widgetSelected(XPathDialogs.java:302)
	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:228)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1176)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3493)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3112)
	at org.eclipse.jface.window.Window.runEventLoop(Window.java:825)
	at org.eclipse.jface.window.Window.open(Window.java:801)
	at org.jboss.ide.eclipse.as.ui.views.server.extensions.XPathActionProvider$4.run(XPathActionProvider.java:145)
	at org.eclipse.jface.action.Action.runWithEvent(Action.java:498)
	at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:584)
	at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:501)
	at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:411)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1176)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3493)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3112)
	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2405)
	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2369)
	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2221)
	at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:500)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:493)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:194)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:368)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:559)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1311)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1287)
Caused by: java.lang.NullPointerException
	at org.jboss.ide.eclipse.as.ui.dialogs.XPathDialogs$XPathDialog$8$1.run(XPathDialogs.java:405)
	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)
	... 44 more

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