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CCombo null pointer exception on unselect [message #453236]

Fri, 01 April 2005 14:58

Roberto

Messages: 42
Registered: July 2009

Member

Hi all,
I am developping an editor with GEF and I found bad NullPointerException :
while
inside an combobox cell editor whith the values list opened, if I click in
the C++ explorer on a project, a folder or a file the following exception
raise (partial stak trace):

java.lang.NullPointerException
at org.eclipse.swt.custom.CCombo.dropDown(CCombo.java:349)
at org.eclipse.swt.custom.CCombo.popupEvent(CCombo.java:895)
at org.eclipse.swt.custom.CCombo$1.handleEvent(CCombo.java:89)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java :82)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:796)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:820)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:801)
at org.eclipse.swt.widgets.Decorations.WM_ACTIVATE(Decorations. java:1434)
at org.eclipse.swt.widgets.Shell.WM_ACTIVATE(Shell.java:1336)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:2969 )
at org.eclipse.swt.widgets.Decorations.windowProc(Decorations.j ava:1391)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:3338 )
at org.eclipse.swt.internal.win32.OS.SetFocus(Native Method)
at org.eclipse.swt.widgets.Control.forceFocus(Control.java:607)
at org.eclipse.swt.widgets.Control.setFocus(Control.java:2054)
at org.eclipse.swt.widgets.Composite.setFocus(Composite.java:44 7)
at org.eclipse.cdt.internal.ui.cview.CView.setFocus(CView.java: 191)
at org.eclipse.ui.internal.WorkbenchPage$2.run(WorkbenchPage.ja va:471)
at
org.eclipse.core.internal.runtime.InternalPlatform.run(Inter nalPlatform.java:616)
at org.eclipse.core.runtime.Platform.run(Platform.java:747)
at
org.eclipse.ui.internal.WorkbenchPage.activatePart(Workbench Page.java:468)
at
org.eclipse.ui.internal.WorkbenchPage.setActivePart(Workbenc hPage.java:2722)

I create the ComboBoxCellEditor to perform a direct edit.
I didn't found a combo box in Logic to test it and I can't found a bug in
bugzilla.

After some debugging I foud folowing: (code snipped from CCombo, lines
around 349)

void dropDown (boolean drop) {
if (drop == isDropped ()) return;
if (!drop) {
348 popup.setVisible (false);
349 text.setFocus();
return;
}

If I set a breakpoint at line 349 the member text is null and this causes
the exception. But more important: the CCombo object (this) at this moment
is disposed. Instead, if I set the breakpoint at line 348, the CCombo is
OK, text is OK and continuing with F8 will not rise the exception.

Note that even with exception my field is updated to the last selected
value as
expected.

What am I doing wrong?

I am using Eclipse 3.0.1 with GEF 3.0.1 on Win 2k

Thanks in advance for any help

Roberto

Report message to a moderator

Re: CCombo null pointer exception on unselect [message #453238 is a reply to message #453236]

Fri, 01 April 2005 15:45

Grant Gayed

Messages: 2150
Registered: July 2009

Senior Member

This looks like https://bugs.eclipse.org/bugs/show_bug.cgi?id=89779 . You
can add yourself as a CC to this report to be notified of its progress.

Grant

"Roberto Genini" <roberto.genini@icimsi.ch> wrote in message
news:opsoj6iydr71gv6x@news.eclipse.org...
> Hi all,
> I am developping an editor with GEF and I found bad NullPointerException :
> while
> inside an combobox cell editor whith the values list opened, if I click in
> the C++ explorer on a project, a folder or a file the following exception
> raise (partial stak trace):
>
> java.lang.NullPointerException
> at org.eclipse.swt.custom.CCombo.dropDown(CCombo.java:349)
> at org.eclipse.swt.custom.CCombo.popupEvent(CCombo.java:895)
> at org.eclipse.swt.custom.CCombo$1.handleEvent(CCombo.java:89)
> at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java :82)
> at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:796)
> at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:820)
> at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:801)
> at org.eclipse.swt.widgets.Decorations.WM_ACTIVATE(Decorations. java:1434)
> at org.eclipse.swt.widgets.Shell.WM_ACTIVATE(Shell.java:1336)
> at org.eclipse.swt.widgets.Control.windowProc(Control.java:2969 )
> at org.eclipse.swt.widgets.Decorations.windowProc(Decorations.j ava:1391)
> at org.eclipse.swt.widgets.Display.windowProc(Display.java:3338 )
> at org.eclipse.swt.internal.win32.OS.SetFocus(Native Method)
> at org.eclipse.swt.widgets.Control.forceFocus(Control.java:607)
> at org.eclipse.swt.widgets.Control.setFocus(Control.java:2054)
> at org.eclipse.swt.widgets.Composite.setFocus(Composite.java:44 7)
> at org.eclipse.cdt.internal.ui.cview.CView.setFocus(CView.java: 191)
> at org.eclipse.ui.internal.WorkbenchPage$2.run(WorkbenchPage.ja va:471)
> at
>
org.eclipse.core.internal.runtime.InternalPlatform.run(Inter nalPlatform.java
:616)
> at org.eclipse.core.runtime.Platform.run(Platform.java:747)
> at
> org.eclipse.ui.internal.WorkbenchPage.activatePart(Workbench Page.java:468)

> at
>
org.eclipse.ui.internal.WorkbenchPage.setActivePart(Workbenc hPage.java:2722)
>
> I create the ComboBoxCellEditor to perform a direct edit.
> I didn't found a combo box in Logic to test it and I can't found a bug in
> bugzilla.
>
> After some debugging I foud folowing: (code snipped from CCombo, lines
> around 349)
>
> void dropDown (boolean drop) {
> if (drop == isDropped ()) return;
> if (!drop) {
> 348 popup.setVisible (false);
> 349 text.setFocus();
> return;
> }
>
> If I set a breakpoint at line 349 the member text is null and this causes
> the exception. But more important: the CCombo object (this) at this moment
> is disposed. Instead, if I set the breakpoint at line 348, the CCombo is
> OK, text is OK and continuing with F8 will not rise the exception.
>
> Note that even with exception my field is updated to the last selected
> value as
> expected.
>
> What am I doing wrong?
>
> I am using Eclipse 3.0.1 with GEF 3.0.1 on Win 2k
>
> Thanks in advance for any help
>
> Roberto

Report message to a moderator

Re: CCombo null pointer exception on unselect [message #453239 is a reply to message #453238]

Fri, 01 April 2005 15:58

Roberto

Messages: 42
Registered: July 2009

Member

Thanks!
What a timing! :-)

Roberto

On Fri, 1 Apr 2005 10:45:29 -0500, Grant Gayed <grant_gayed@ca.ibm.com>
wrote:

> This looks like https://bugs.eclipse.org/bugs/show_bug.cgi?id=89779 .
> You
> can add yourself as a CC to this report to be notified of its progress.
>
> Grant
>

Report message to a moderator

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