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I had an empty IDE and opened project "image" (the standard NetBeans module). The IDE started to scan the project's classpath... and suddenly it stopped in the middle of the process (see the attached screenshot). Apparently, the AWT event queue thrad runs, as the IDE still gets repainted if it is (partly or fully) obscured and then uncovered. I will attach the full thread dump.
*** Issue 48322 has been marked as a duplicate of this issue. ***
Created attachment 17293 [details] screenshot of the progress dialog
Created attachment 17294 [details] full thread dump
Created attachment 18084 [details] ISE at NB shutdown.
Marian, do you remember if there were any exceptions thrown to the console before the IDE got frozen?
Sorry, I do not remember. If I had noticed some, I would have mentioned them in this bug report but I am not sure.
Have you seen this several times, or just once when you filed this report? I am not able to reproduce this.
I saw it just once.
Sorry, I am not able to reproduce this. We have made some synchronization changes in BtreeDatabase and BtreeStorage which could have fixed this. Please reopen if you see it again and attach the whole messages.log.
It hasn't happend again since then. Verified.