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While this happened in the Auto Comment tool, I somehow don't think it is its fault. See also issue #30299. Using NB 3.4.1 with JDK 1.4.1_01. Attaching ThreadDump.
Created attachment 8653 [details] ThreadDump
That seems like problem in JVM Thread is waiting on monitor entry for at "AWT-EventQueue-0" prio=7 tid=0x0FE698E0 nid=0x94c waiting for monitor entry [135df000..135dfd8c] at java.lang.StringBuffer.<init>(StringBuffer.java:115) at org.openide.filesystems.AbstractFolder.getPackageNameExt(AbstractFolder.java:167) Can you reproduce it?
*** Issue 30299 has been marked as a duplicate of this issue. ***
It's not exactly reproducable. It just hangs after working much in a relatively short time. We have at least one additional machine where it also happens. I am waiting for a thread dump from that one. Is it possible that this is a Java2D problem?
P Nejedly, please evaluate this bug.
Both this and issue #30299 seem to me like some problem in JVM. In both dumps, several threads are waiting for new char[] or some other allocation to happen. Like if the JVM internal heap allocator mutex went crazy...
Maybe this is related to issue #30464?
yes duplicate of #30464 *** This issue has been marked as a duplicate of 30464 ***
Resolved for 3.4.x or earlier, no new info since then -> verified.
Resolved for 3.4.x or earlier, no new info since then -> closing.