Description Brian de Alwis 2011-12-07 17:28:46 EST

Created attachment 208076 [details]
Small test program that causes a hang

Version: 4.2.0 (for M4)
Build id: I20111205-2330
OS: MacOS X 10.7.2

In using the JFace TextCellEditor support, I discovered a means to cause a hang of the JVM when editing a table cell on MacOS X.  I'll attach a small test program in a moment to reproduce the hang.  (I've had two other strange hangs recently that I'm hoping can be traced to this same cause; this is the only reproducible hang.)

Steps to repeat:

1. Run the attached code snippet from a 4.2 image with JFace (it may occur on the 3.8; I haven't yet verified). This should pop up a little table viewer with 3 entries showing a key and a value.  Two of the entries have a value, and the third should be empty (it's actually null).
2. Click in the null value for the "c" item.
3. See the instance hang.

The problem is caused by an exception being raised (org.eclipse.core.runtime.AssertionFailedException), leading to the hang.

The stack at the point of assertion:

"Thread-1" daemon prio=5 tid=7facb3831000 nid=0x7fff7971f960 runnable [7fff634d8000]
   java.lang.Thread.State: RUNNABLE
        at org.eclipse.core.runtime.Assert.isTrue(Assert.java:110)
        at org.eclipse.core.runtime.Assert.isTrue(Assert.java:96)
        at org.eclipse.jface.viewers.TextCellEditor.doSetValue(TextCellEditor.java:228)
        at org.eclipse.jface.viewers.CellEditor.setValue(CellEditor.java:857)
        at org.eclipse.jface.viewers.EditingSupport.initializeCellEditorValue(EditingSupport.java:100)
        at org.eclipse.jface.viewers.ColumnViewerEditor.activateCellEditor(ColumnViewerEditor.java:195)
        at org.eclipse.jface.viewers.ColumnViewerEditor.handleEditorActivationEvent(ColumnViewerEditor.java:445)
        at org.eclipse.jface.viewers.ColumnViewer.triggerEditorActivationEvent(ColumnViewer.java:680)
        at org.eclipse.jface.viewers.ColumnViewer.handleMouseDown(ColumnViewer.java:664)
        at org.eclipse.jface.viewers.ColumnViewer.access$0(ColumnViewer.java:660)
        at org.eclipse.jface.viewers.ColumnViewer$1.mouseDown(ColumnViewer.java:89)
        at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:191)
        at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
        at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4129)
        at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1457)
        at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1480)
        at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1465)
        at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1270)
        at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3975)
        at org.eclipse.swt.widgets.Display.applicationNextEventMatchingMask(Display.java:4876)
        at org.eclipse.swt.widgets.Display.applicationProc(Display.java:5227)
        at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method)
        at org.eclipse.swt.widgets.Widget.callSuper(Widget.java:220)
        at org.eclipse.swt.widgets.Widget.mouseDownSuper(Widget.java:1092)
        at org.eclipse.swt.widgets.Table.mouseDownSuper(Table.java:2004)
        at org.eclipse.swt.widgets.Widget.mouseDown(Widget.java:1084)
        at org.eclipse.swt.widgets.Control.mouseDown(Control.java:2528)
        at org.eclipse.swt.widgets.Table.mouseDown(Table.java:1966)
        at org.eclipse.swt.widgets.Display.windowProc(Display.java:5476)
        at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method)
        at org.eclipse.swt.widgets.Widget.callSuper(Widget.java:220)
        at org.eclipse.swt.widgets.Widget.windowSendEvent(Widget.java:2095)
        at org.eclipse.swt.widgets.Shell.windowSendEvent(Shell.java:2252)
        at org.eclipse.swt.widgets.Display.windowProc(Display.java:5540)
        at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method)
        at org.eclipse.swt.widgets.Display.applicationSendEvent(Display.java:4990)
        at org.eclipse.swt.widgets.Display.applicationProc(Display.java:5139)
        at org.eclipse.swt.internal.cocoa.OS.objc_msgSend(Native Method)
        at org.eclipse.swt.internal.cocoa.NSApplication.sendEvent(NSApplication.java:128)
        at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3611)
        at testswt.HangBugTest.main(HangBugTest.java:139)


The stack once hung:

"Thread-1" daemon prio=5 tid=7facb3831000 nid=0x7fff7971f960 runnable [7fff634d9000]
   java.lang.Thread.State: RUNNABLE
        at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method)
        at org.eclipse.swt.widgets.Widget.callSuper(Widget.java:220)
        at org.eclipse.swt.widgets.Widget.mouseDownSuper(Widget.java:1092)
        at org.eclipse.swt.widgets.Table.mouseDownSuper(Table.java:2004)
        at org.eclipse.swt.widgets.Widget.mouseDown(Widget.java:1084)
        at org.eclipse.swt.widgets.Control.mouseDown(Control.java:2528)
        at org.eclipse.swt.widgets.Table.mouseDown(Table.java:1966)
        at org.eclipse.swt.widgets.Display.windowProc(Display.java:5476)
        at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method)
        at org.eclipse.swt.widgets.Widget.callSuper(Widget.java:220)
        at org.eclipse.swt.widgets.Widget.windowSendEvent(Widget.java:2095)
        at org.eclipse.swt.widgets.Shell.windowSendEvent(Shell.java:2252)
        at org.eclipse.swt.widgets.Display.windowProc(Display.java:5540)
        at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method)
        at org.eclipse.swt.widgets.Display.applicationSendEvent(Display.java:4990)
        at org.eclipse.swt.widgets.Display.applicationProc(Display.java:5139)
        at org.eclipse.swt.internal.cocoa.OS.objc_msgSend(Native Method)
        at org.eclipse.swt.internal.cocoa.NSApplication.sendEvent(NSApplication.java:128)
        at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3611)
        at testswt.HangBugTest.main(HangBugTest.java:139)