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NetBeans build 080313, JDK 1.6.0_10-b13-fastdebug, Linux (Ubuntu 7.10), quad-core Intel PC -- When opening a very simple J2SE project during startup, a livelock occurred. The status bar displays "Collecting Project Dependencies..." but the corresponding progress bar does not move. It seems that thread "Java Source Worker Thread" is busy doing a never-ending task. See the attached thread-dump for more detailed information. Below are the top frames from the suspicious thread. See the attachment (full thread-dump generated by jstack) for more information about this thread and other threads. "Java Source Worker Thread" prio=10 tid=0x9fe5e000 nid=0x4080 runnable [0x9bcfe000..0x9bcff130] java.lang.Thread.State: RUNNABLE at java.lang.Throwable.fillInStackTrace(Native Method) - locked <0xa1226680> (a java.lang.IllegalMonitorStateException) at java.lang.Throwable.<init>(Throwable.java:181) at java.lang.Exception.<init>(Exception.java:29) at java.lang.RuntimeException.<init>(RuntimeException.java:32) at java.lang.IllegalMonitorStateException.<init>(IllegalMonitorStateException.java:31) at sun.awt.EventListenerAggregate.add(EventListenerAggregate.java:75) - locked <0xa2444448> (a sun.awt.EventListenerAggregate) at java.beans.PropertyChangeSupport.addPropertyChangeListener(PropertyChangeSupport.java:75) - locked <0xa242c610> (a java.beans.PropertyChangeSupport) at o.n.m.java.api.common.SourceRoots.addPropertyChangeListener(SourceRoots.java:302) at o.n.m.java.api.common.queries.CompiledSourceForBinaryQueryImpl$Result.<init> (CompiledSourceForBinaryQueryImpl.java:139) ...
Created attachment 58459 [details] full thread dump (from jstack)
Seems really strange - in my sources, EventListenerAggregate.java:75 contains only assignment into an array, not sure how it could throw IMSE. Anyway, I tried to add new IMSE() into SourceRoots.addPropertyChangeListener, and no infinite loop occurred, so it seems more like a JDK problem. When it happens again, could you please do several thread dumps with jstack -m -l? Thanks.
I did not find any corresponding sources for sun.awt.EventListenerAggregate - the bundled src.zip does not contain sources for package 'sun.awt'. Sources available from jdk6.dev.java.net and openjdk.java.net do not match the line numbers. The next time the livelock happens, I will generate several thread-dumps using jstack.
I talked to Petr N., and this seems like another issue with biased locking. The mixed thread dumps would help me to file a bug against JDK. Also please include output from java -version (of the JDK on which the IDE runs). Thanks.
//closing INCOMPLETE issues older than a 4 weeks Please reopen if the problem persists, or verify if it has been solved. Thank you