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Build Identifier: Under load Eclipselink 2.1 will be in an effective deadlock (not a java deadlock) in the concurrency manager while waiting to release a deferred lock. Please find the log file enclosed with thread dump and printLocks() log using eclipselink.cache.record-stack-on-lock=true. From the logs, it appears to be happening between the following threads. 1644838203@qtp-1567434291-6 and a daemon thread {"RMI TCP Connection(596)-10.32.0.129" daemon prio=10 tid=0x000000005f4e8000 nid=0x15ee in Object.wait() [0x0000000040538000]} where daemon thread has acquired a lock on a Vector and is waiting to acquire ReadLock whereas other thread after acquiring lock has been waiting to acquire lock on vector. Please see enclosed log for more details. Reproducible: Couldn't Reproduce Steps to Reproduce: Can only reproduce under load with a customer application which is difficult to attach.
This has been reproduced with EclipseLink 2.1.
Created attachment 175682 [details] Log File containing Thread dump and output from printLocks()
Reqires triage for 2.1.2
Created attachment 176255 [details] Fix
Discussed this bug with Peter Krogh and permission has been given for it to be checked into 2.1.1 only. A separate bug and fix is required for trunk.
Missed the 2.1.1 cutoff. 2.1.2 is the next patch release.
Created attachment 177425 [details] Fix
Completed: At revision: 8100 Fixed in 2.1 trunk (2.1.2)
This bug should not be closed until the issue is fixed in TRUNK. For the TRUNK fix the more risky but better long term bug fix is to acquire locks in the Distributed merge using the same artifacts and mechanisms as the UOW merge.
Created attachment 178994 [details] Fix in main trunk
Created attachment 179227 [details] Fix in main trunk - conflict resolved There was another check-in made after the patch was uploaded causing a conflict. The conflict is resolved, and another version of patch is enclosed.
Fixed in EL trunk At revision: 8220
*** Bug 328308 has been marked as a duplicate of this bug. ***
The Eclipselink project has moved to Github: https://github.com/eclipse-ee4j/eclipselink
