[CLOV-1614] Error when closing Cloud Editor in Eclipse

Type: Bug
Resolution: Won't Fix
Priority: Low
Fix Version/s: someday
Affects Version/s: None
Component/s: CEP Plugin
Labels:
None

Symptom Severity:
Severity 3 - Minor

Closing the "Cloud Editor" in Eclipse causes that sometimes an exception is thrown and reported in the Error Log:

Error disposing widget for : org.eclipse.e4.ui.model.application.ui.basic.impl.PartImpl Clover Coverage Cloud Report


java.lang.NullPointerException
	at org.eclipse.swt.custom.CTabFolderLayout.computeSize(CTabFolderLayout.java:39)
	at org.eclipse.swt.widgets.Composite.computeSize(Composite.java:234)
	at org.eclipse.swt.layout.GridData.computeSize(GridData.java:491)
	at org.eclipse.swt.layout.GridLayout.layout(GridLayout.java:221)
	at org.eclipse.swt.layout.GridLayout.layout(GridLayout.java:197)
	at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1290)
	at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1297)
	at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1297)
	at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1297)
	at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1276)
	at org.eclipse.swt.widgets.Composite.layout(Composite.java:665)
	at org.eclipse.swt.custom.CTabFolder.runUpdate(CTabFolder.java:3755)
	at org.eclipse.swt.custom.CTabItem.getBounds(CTabItem.java:149)
	at org.eclipse.swt.custom.CTabFolder.onPaint(CTabFolder.java:1993)
	at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.java:289)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4353)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1061)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1085)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1070)
	at org.eclipse.swt.widgets.Composite.WM_PAINT(Composite.java:1491)
	at org.eclipse.swt.widgets.Control.windowProc(Control.java:4667)
	at org.eclipse.swt.widgets.Display.windowProc(Display.java:5036)
	at org.eclipse.swt.internal.win32.OS.VtblCall(Native Method)
	at org.eclipse.swt.internal.ole.win32.IOleInPlaceObject.InPlaceDeactivate(IOleInPlaceObject.java:21)

and

Unhandled event loop exception

java.lang.NullPointerException
	at org.eclipse.swt.custom.CTabFolderLayout.computeSize(CTabFolderLayout.java:39)
	at org.eclipse.swt.widgets.Composite.computeSize(Composite.java:234)
	at org.eclipse.swt.layout.GridData.computeSize(GridData.java:491)
	at org.eclipse.swt.layout.GridLayout.layout(GridLayout.java:221)
	at org.eclipse.swt.layout.GridLayout.layout(GridLayout.java:197)
	at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1290)
	at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1297)
	at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1297)
	at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1297)
	at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1297)
	at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1297)
	at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1297)
	at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1297)
	at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1297)
	at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1297)
	at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1297)
	at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1276)
	at org.eclipse.swt.widgets.Composite.setLayoutDeferred(Composite.java:1087)
	at org.eclipse.swt.widgets.Display.runDeferredLayouts(Display.java:4196)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3754)
	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)

Apparently, it fails in the CTabFolderLayout.computeSize() method:

protected Point computeSize(Composite composite, int wHint, int hHint, boolean flushCache) {
    CTabFolder folder = (CTabFolder)composite;
    CTabFolderRenderer renderer = folder.renderer;
    ...
    tabW = Math.max(tabW, renderer.computeSize(width, 2, gc, -1, -1).x);

the 'renderer' is null. This renderer is being set in CTabFolder.init() method and set to null in the CTabFolder.onDispose() method.

It may be related with the:

CloudEditor.dispose() which calls removeCoverageChangeListener after the super.dispose() so a refresh event may come in the meantinme

or

CloudEditor.createPages() which "hacks" the container layout by changing it from FillLayout to GridLayout.

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