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The modules develepors can add (or disable system ErrorManager) his own ErrorManager to the system Lookup. There is no comment about that in ErrorManager javadoc documentation. IMHO this is usefull information. For example there is opened issue #14674 in XTEST module since 2001-08-21. Propbably the developer of this issue didn't that there is this feature.
Well ErrorManager was never really documented and I hope it will be replaced by java.util.logging before it is. *** This issue has been marked as a duplicate of 17747 ***
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