Description Boris Pruessmann 2002-12-06 14:55:20 EST

Writing an action that uses the CompareUI, I get the following exception.

Caused by: org.eclipse.swt.SWTException: Invalid thread access
	at org.eclipse.swt.SWT.error(SWT.java:2139)
	at org.eclipse.swt.SWT.error(SWT.java:2071)
	at org.eclipse.swt.widgets.Display.error(Display.java:529)
	at org.eclipse.swt.widgets.Display.checkDevice(Display.java:397)
	at org.eclipse.swt.widgets.Display.getSystemColor(Display.java:1048)
	at org.eclipse.compare.internal.ComparePreferencePage.initDefaults
(ComparePreferencePage.java:95)
	at 
org.eclipse.compare.internal.CompareUIPlugin.initializeDefaultPreferences
(CompareUIPlugin.java:127)
	at 
org.eclipse.ui.plugin.AbstractUIPlugin.initializeDefaultPluginPreferences
(AbstractUIPlugin.java:624)
	at org.eclipse.core.runtime.Plugin.getPluginPreferences(Plugin.java:347)
	at 
org.eclipse.ui.plugin.AbstractUIPlugin$CompatibilityPreferenceStore.initialize
(AbstractUIPlugin.java:180)
	at org.eclipse.ui.plugin.AbstractUIPlugin.getPreferenceStore
(AbstractUIPlugin.java:561)
	at org.eclipse.compare.internal.CompareUIPlugin.initPreferenceStore
(CompareUIPlugin.java:788)
	at org.eclipse.compare.internal.CompareUIPlugin.<init>
(CompareUIPlugin.java:118)

My action does not run in the display thread and uses Display.asyncExec() to 
open the CompareUI. However, the CompareUI component's load is triggered when 
the referencing class is loaded at that happens outside the UI thread. 

If I used Eclipse's compare actions before, thus triggering the load of the 
component, everything works as expected.