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Happened to me three times in a row in my user dir; not otherwise sure how to reproduce. JDK 1.5b51, trunk build. Thread dump should make it clear. VCS stuff must not block waiting for a dialog to be shown in the middle of some random method. (No dialog *is* shown.)
Created attachment 15209 [details] Thread dump
After deleting my $userdir/config/VCSMount/*.xml, IDE starts up OK. Curiously, my mounts are still there. ??
This is a warning that is displayed when a non-existing filesystem property is to be set from a variable. One FS property was removed recently. When you have CVS filesystem from an older build, which stores the whole set of variables, you encounter this problem. The fix would be to present the dialog from a new thread, since the DialogDisplayer does not have non-blocking notification.
Fixed in trunk: /cvs/vcsgeneric/src/org/netbeans/modules/vcs/advanced/CommandLineVcsFileSystem.java,v <-- CommandLineVcsFileSystem.java new revision: 1.146; previous revision: 1.145