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The NetBeans IDE 5.5 crashed (hangs) when trying to import WTK 2.5.1EA MobileMediaAPI project with default for this project device configuration/profile (CLDC-1.0 and MID-P2.0). It was repeated on the three different PCs. But MobileMediaAPI project successfully imported if change device configuration from CLDC-1.0 to CLDC-1.1 in New Project/Default Platform Selection dialog box. p.s. The same situation is for the SnapMobileSample WTK 2.5.1EA projects.
I cannot reproduce it in 5.5 nor in 6.0. Please reopen if happends again. You can help us by running nb.exe instead of netbeans.exe. In the console you can invoke thread dump (CTRL-Break) when deadlock occures and attach it here. From the thread dump we are able to fix the deadlock even without reproducing it.
other ways how to generate thread dump when deadlock occurs are described in http://qa.netbeans.org/bugzilla/generating-thread-dumps.html