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When using JDK 6 upd 21 switching to "design" hangs netbeans. Tried on Windows XP and Ubuntu 10.04 with netbeans 6.9, 6.9.1 - same problem. Forum topic: http://forums.netbeans.org/viewtopic.php?t=29597
Created attachment 101790 [details] Thread dump, netbeans hang on jdk6u23_b01 This thread dump made during netbeans hang, showing 1 deadlock. Netbeans running under jdk6u23_b01 early access, hang same as in jdk6u21.
This is a known problem introduced in jdk6u21. We have reported this problem to JDK team and we expect them to fix it in jdk6u23 soon. *** This bug has been marked as a duplicate of bug 187697 ***