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Version: 3.1.0 Build id: 200408101200 (was also happening in HEAD code). 1) Export a preference set. 2) Import it. A dialog appears warning about an error that has occured "Updating Installed JREs". Closing the workbench now prompts another error dialog "Preference node "org.eclipse.jdt.core" has been removed." Stack traces attached.
Created attachment 14060 [details] Stack traces.
It looks like this problem is originating in the JDT core. Reassigning.
Fixed. JDT/Core workspace preferences were stored in JavaCore and not refreshed when they were removed during the import... Add a listener to JavaCore instance which listen when workspace preferences are removed and refresh stored preferences with new one. [jdt-core-internal] Changes done in JavaCore.start(BundleContext). Test cases added in OptionTests.
*** Bug 73707 has been marked as a duplicate of this bug. ***
Verified in I200409240100.