Issue
In error log:
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Caused by: java.lang.NoClassDefFoundError: org/eclipse/jpt/common/utility/internal/StatefulCommandExecutor
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Caused by: java.lang.ClassNotFoundException: org.eclipse.jpt.common.utility.internal.StatefulCommandExecutor
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Which package does this belong to? How could I reinstall this package ?
EDIT: Preference->Run/Debug->Launching->Default Launchers. It's empty there. The Launch Type and it's Preferred Launcher column is empty. Is it normal? If this is causing the problem. How can I fix it?
Solution
This seems to match this Eclipse bug: https://bugs.eclipse.org/bugs/show_bug.cgi?id=379473 for Dali JPA Tools. The bug is marked as a duplicate of https://bugs.eclipse.org/bugs/show_bug.cgi?id=385334 which has a lot of discussion about the problem.
The bug seems to occur for several things loaded from Eclipse Marketplace - for example WAS Liberty Profile see http://www.eclipse.org/forums/index.php/t/367601/
Also see this earlier SO question which is probably the same thing: Error in Eclipse
Answered By - greg-449
