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20020521 (F1) - Window -> Preferences - Debug -- Launch History - click "Restore Defaults" - click "Apply" Walkback in .log pasted below. I am not sure if this is becase I had my launch history size set to 15, and I did have 15 entries, or if this is some other problem. !ENTRY org.eclipse.core.resources 1 4 May 24, 2002 12:07:54.255 !MESSAGE Unhandled exception caught in event loop. !ENTRY org.eclipse.ui 4 0 May 24, 2002 12:07:54.265 !MESSAGE java.lang.String !STACK 0 java.lang.ClassCastException: java.lang.String at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationManager.pr opertyChange(LaunchConfigurationManager.java:813) at org.eclipse.ui.plugin.AbstractUIPlugin$CompatibilityPreferenceStore.fireProperty ChangeEvent(AbstractUIPlugin.java:247) at org.eclipse.ui.plugin.AbstractUIPlugin$1.propertyChange (AbstractUIPlugin.java:188) at org.eclipse.core.runtime.Preferences.firePropertyChangeEvent (Preferences.java:505) at org.eclipse.core.runtime.Preferences.setToDefault (Preferences.java:1189) at org.eclipse.ui.plugin.AbstractUIPlugin$CompatibilityPreferenceStore.setToDefault (AbstractUIPlugin.java:415) at org.eclipse.jface.preference.FieldEditor.store(FieldEditor.java:573) at org.eclipse.debug.internal.ui.preferences.LaunchHistoryPreferencePage.performOk (LaunchHistoryPreferencePage.java:192) at org.eclipse.jface.preference.PreferencePage.performApply (PreferencePage.java:375) at org.eclipse.jface.preference.PreferencePage$2.widgetSelected (PreferencePage.java:247) at org.eclipse.swt.widgets.TypedListener.handleEvent (TypedListener.java:85) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java (Compiled Code)) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java(Compiled Code)) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java (Compiled Code)) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java (Compiled Code)) at org.eclipse.jface.window.Window.runEventLoop(Window.java(Compiled Code)) at org.eclipse.jface.window.Window.open(Window.java:538) at org.eclipse.ui.internal.OpenPreferencesAction.run (OpenPreferencesAction.java:47) at org.eclipse.jface.action.Action.runWithEvent(Action.java:590) at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection (ActionContributionItem.java:407) at org.eclipse.jface.action.ActionContributionItem.handleWidgetEvent (ActionContributionItem.java:361) at org.eclipse.jface.action.ActionContributionItem.access$0 (ActionContributionItem.java:352) at org.eclipse.jface.action.ActionContributionItem$ActionListener.handleEvent (ActionContributionItem.java:47) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java (Compiled Code)) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java(Compiled Code)) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java (Compiled Code)) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java (Compiled Code)) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java (Compiled Code)) at org.eclipse.ui.internal.Workbench.run(Workbench.java:1068) at org.eclipse.core.internal.boot.InternalBootLoader.run (InternalBootLoader.java:739) at org.eclipse.core.boot.BootLoader.run(BootLoader.java:462) at java.lang.reflect.Method.invoke(Native Method) at org.eclipse.core.launcher.Main.basicRun(Main.java:200) at org.eclipse.core.launcher.Main.run(Main.java:643) at org.eclipse.core.launcher.Main.main(Main.java:476)
*** This bug has been marked as a duplicate of 16970 ***