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I tried to mount Ant 1.5.4 and Xerces 2.5.0 sources. This always ends with OutOfMemory errors (another P1) but if you try to use editor during the scan before these errors there is another problem - suggestion scan blocks default RP with SwingUtililities.invokeAndWait and editor waits for something that should be processed default RP.
Created attachment 12625 [details] thread dump
Radim I propably do not understand the thread dump but from my point of view problem lies in org.netbeans.modules.java.parser.SourceImplProxy.findModelDelegate that waits for some dead thread.
It seems to be a duplicate of the issue #25934. Are you able to reproduce it? *** This issue has been marked as a duplicate of 25934 ***