deadlock in CayenneContext.commitChanges

From: Aristedes Maniatis (ar..sh.com.au)
Date: Fri Nov 09 2007 - 05:00:30 EST

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I was able to create a deadlock between two threads committing to the
same context today. Cayenne as of svn trunk yesterday. Are contexts
not thread-safe for writing or is this a bug?

[java] -- Thread Foxtrot Single Worker Thread #3 (Id = 39) BLOCKED
org.apache.cayenne.event.DispatchQueu..8c8aa
[java] --
org
.apache.cayenne.event.DispatchQueue.dispatchEvent(DispatchQueue.java:54)
[java] --
org.apache.cayenne.event.EventManager.dispatchEvent(EventManager.java:
348)
[java] --
org.apache.cayenne.event.EventManager.postEvent(EventManager.java:319)
[java] --
org.apache.cayenne.remote.ClientChannel.onSync(ClientChannel.java:215)
[java] --
org.apache.cayenne.CayenneContext.doCommitChanges(CayenneContext.java:
249)
[java] --
org.apache.cayenne.CayenneContext.commitChanges(CayenneContext.java:208)

[java] -- Thread AWT-EventQueue-0 (Id = 22) BLOCKED
org.apache.cayenne.CayenneContextGraphManage..b0e6f
[java] --
org
.apache
.cayenne
.CayenneContextMergeHandler
.runWithEventsDisabled(CayenneContextMergeHandler.java:266)
[java] --
org
.apache
.cayenne
.CayenneContextMergeHandler
.graphFlushed(CayenneContextMergeHandler.java:81)
[java] -- sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
[java] --
sun
.reflect
.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
25)
[java] -- java.lang.reflect.Method.invoke(Method.java:585)
[java] -- org.apache.cayenne.util.Invocation.fire(Invocation.java:204)
[java] -- org.apache.cayenne.event.EventManager
$Dispatch.fire(EventManager.java:409)
[java] --
org
.apache.cayenne.event.DispatchQueue.dispatchEvent(DispatchQueue.java:
162)
[java] --
org
.apache.cayenne.event.DispatchQueue.dispatchEvent(DispatchQueue.java:58)
[java] --
org.apache.cayenne.event.EventManager.dispatchEvent(EventManager.java:
348)
[java] --
org.apache.cayenne.event.EventManager.postEvent(EventManager.java:319)
[java] --
org.apache.cayenne.remote.ClientChannel.onSync(ClientChannel.java:215)
[java] --
org.apache.cayenne.CayenneContext.doCommitChanges(CayenneContext.java:
249)
[java] --
org.apache.cayenne.CayenneContext.commitChanges(CayenneContext.java:208)

Ari Maniatis

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