Can you please post a full stack trace ?
I also found another defect in that widget
borderColor is a private class field
@Override
public void paintControl(PaintEvent e) {
...
/*
* Draws the border
*/
if ((style & SWT.BORDER) != 0) {
if (borderColor == null || borderColor.isDisposed())
borderColor = getDisplay().getSystemColor(SWT.COLOR_BLACK);
...
}
@Override
public void setBackground(Color color) {
this.backgroundColor = color;
if (this.borderColor != null && !this.borderColor.isDisposed())
this.borderColor.dispose();
this.borderColor = ColorUtils.scaleColorBy(color,
BORDER_LIGHTNESS_SCALE);
this.redraw();
}
Disposing a system color is strictly forbidden.
---
** [bugs:#830] Switching Eclipse themes triggers exceptions when using Saros**
**Status:** open
**Group:** OTHER
**Labels:** Eclipse 4.4
**Created:** Fri Jun 27, 2014 11:11 AM UTC by Franz Zieris
**Last Updated:** Fri Jun 27, 2014 11:11 AM UTC
**Owner:** nobody
Since Eclipse 4.4 (in particular since [this
commit](http://git.eclipse.org/c/platform/eclipse.platform.ui.git/commit/bundles/org.eclipse.e4.ui.css.swt/src/org/eclipse/e4/ui/css/swt/dom/ControlElement.java?h=R4_4_maintenance&id=946c6d54de1d199bb882124673f4ede122a00f89),
which fixes [this bug](https://bugs.eclipse.org/bugs/show_bug.cgi?id=423813)),
the SWT method Control.setBackground() is sometimes called with a null value,
in particular when switching the theme of Eclipse (Preferences > General >
Appearance), e.g. to the new "Dark" theme.
This null value is not expected in the RoundedComposite class and produces a
NullPointerException.
But the fix is not as easy as just ignoring null values. For some reason, even
if the "setBackground()" method does nothing on null values, there will be a
ConcurrentModificationException in the Eclipse code.
Steps to reproduce:
* Use Eclipse 4.4
* Use Saros 13.12.6, or the current master (i.e.
[fa1f320](https://github.com/saros-project/saros/commit/fa1f320))
* Start a Saros session, so the session chat appears (this should also work
with a single user chat -- we only need instances of RoundedComposite).
* Change the theme of Eclipse (Prefences > General > Appearance), e.g. to "Dark"
* An error message will appear, and the theme change will not be performed
completely.
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