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Type: Bug
Resolution: Duplicate
Priority: Major
Fix Version/s: 4.3.0.Alpha1
Affects Version/s: 4.2.0.CR1
Component/s: visual-page-editor-core
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Steps to Reproduce:

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EXECUTE: Open some HTML Page with VPV Editor
EXECUTE: Make some change in text and save the editor
EXECUTE: Close the editor
EXECUTE: Open the same HTML Page in "HTML Editor"
EXECUTE: Make some change in text and save the editor
ASSERT: (FAIL) No exceptions in Error Log

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EXECUTE: Open some HTML Page with VPV Editor EXECUTE: Make some change in text and save the editor EXECUTE: Close the editor EXECUTE: Open the same HTML Page in "HTML Editor" EXECUTE: Make some change in text and save the editor ASSERT: (FAIL) No exceptions in Error Log

NullPointerException occurs when switching from VPV Editor to HTML Editor.

It looks like VPV Editor doesn't clean up some resources (like listeners) when it's closed.

!ENTRY org.eclipse.wst.sse.core 4 4 2014-10-08 03:45:40.608
!MESSAGE 
!STACK 0
java.lang.NullPointerException
	at org.jboss.tools.vpe.preview.editor.VpvEditor$10.documentChanged(VpvEditor.java:723)
	at org.eclipse.wst.sse.core.internal.text.BasicStructuredDocument._fireDocumentChanged(BasicStructuredDocument.java:460)
	at org.eclipse.wst.sse.core.internal.text.BasicStructuredDocument.fireStructuredDocumentEvent(BasicStructuredDocument.java:1184)
	at org.eclipse.wst.sse.core.internal.text.BasicStructuredDocument.internalReplaceText(BasicStructuredDocument.java:1964)
	at org.eclipse.wst.sse.core.internal.text.BasicStructuredDocument.replaceText(BasicStructuredDocument.java:2423)
	at org.eclipse.wst.sse.core.internal.text.BasicStructuredDocument.replaceText(BasicStructuredDocument.java:2408)
	at org.eclipse.wst.sse.core.internal.text.JobSafeStructuredDocument.access$2(JobSafeStructuredDocument.java:1)
	at org.eclipse.wst.sse.core.internal.text.JobSafeStructuredDocument$3.run(JobSafeStructuredDocument.java:141)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.wst.sse.ui.EditorExecutionContext.execute(EditorExecutionContext.java:149)
	at org.eclipse.wst.sse.core.internal.text.JobSafeStructuredDocument.replaceText(JobSafeStructuredDocument.java:144)
	at org.eclipse.wst.sse.core.internal.text.BasicStructuredDocument.replace(BasicStructuredDocument.java:2368)
	at org.eclipse.wst.sse.core.internal.text.JobSafeStructuredDocument.access$0(JobSafeStructuredDocument.java:1)
	at org.eclipse.wst.sse.core.internal.text.JobSafeStructuredDocument$1.run(JobSafeStructuredDocument.java:103)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.wst.sse.ui.EditorExecutionContext.execute(EditorExecutionContext.java:149)
	at org.eclipse.wst.sse.core.internal.text.JobSafeStructuredDocument.replace(JobSafeStructuredDocument.java:106)
	at org.eclipse.jface.text.projection.ProjectionTextStore.replace(ProjectionTextStore.java:111)
	at org.eclipse.jface.text.AbstractDocument.replace(AbstractDocument.java:1184)
	at org.eclipse.jface.text.AbstractDocument.replace(AbstractDocument.java:1210)
	at org.eclipse.jface.text.projection.ProjectionDocument.replace(ProjectionDocument.java:629)
	at org.eclipse.jface.text.DefaultDocumentAdapter.replaceTextRange(DefaultDocumentAdapter.java:248)
	at org.eclipse.swt.custom.StyledText.modifyContent(StyledText.java:7268)
	at org.eclipse.swt.custom.StyledText.sendKeyEvent(StyledText.java:8111)
	at org.eclipse.swt.custom.StyledText.doContent(StyledText.java:2481)
	at org.eclipse.swt.custom.StyledText.handleKey(StyledText.java:5955)
	at org.eclipse.swt.custom.StyledText.handleKeyDown(StyledText.java:5986)
	at org.eclipse.swt.custom.StyledText$7.handleEvent(StyledText.java:5663)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4486)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1388)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1412)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1397)
	at org.eclipse.swt.widgets.Widget.sendIMKeyEvent(Widget.java:1474)
	at org.eclipse.swt.widgets.Control.gtk_commit(Control.java:3043)
	at org.eclipse.swt.widgets.Canvas.gtk_commit(Canvas.java:163)
	at org.eclipse.swt.widgets.Widget.windowProc(Widget.java:2079)
	at org.eclipse.swt.widgets.Control.windowProc(Control.java:5510)
	at org.eclipse.swt.widgets.Display.windowProc(Display.java:4700)
	at org.eclipse.swt.internal.gtk.OS._gtk_im_context_filter_keypress(Native Method)
	at org.eclipse.swt.internal.gtk.OS.gtk_im_context_filter_keypress(OS.java:8499)
	at org.eclipse.swt.widgets.Control.filterKey(Control.java:2386)
	at org.eclipse.swt.widgets.Control.gtk_key_press_event(Control.java:3262)
	at org.eclipse.swt.widgets.Composite.gtk_key_press_event(Composite.java:777)
	at org.eclipse.swt.widgets.Widget.windowProc(Widget.java:2098)
	at org.eclipse.swt.widgets.Control.windowProc(Control.java:5510)
	at org.eclipse.swt.widgets.Display.windowProc(Display.java:4700)
	at org.eclipse.swt.internal.gtk.OS._gtk_main_do_event(Native Method)
	at org.eclipse.swt.internal.gtk.OS.gtk_main_do_event(OS.java:9074)
	at org.eclipse.swt.widgets.Display.eventProc(Display.java:1253)
	at org.eclipse.swt.internal.gtk.OS._g_main_context_iteration(Native Method)
	at org.eclipse.swt.internal.gtk.OS.g_main_context_iteration(OS.java:2473)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3439)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1151)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1032)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:148)
	at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:636)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:579)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:135)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:382)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:236)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:648)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:603)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1465)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1438)

duplicates

JBIDE-18977 JBoss HTML Editor pollutes log with NullPointerExceptions

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