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[BUG] Intermittent ConcurrentModificationException using getMergedConnectorMessage #92
Description
Activity
@sbraconnier Are you able to reproduce this error and get a fresh stack trace? If so, can you share the mirth/oie version you were running when receiving the error as well as details about how the channel is configured? I am especially interested in destination queue settings and if there is channelMap or responseMap modification in the javascript transformer, response transformer, or post-processor.
Well, I don't work anymore for the company where I encountered this problem, so I don't have access to this channel anymore. I tried many times to reproduce the issue locally but never succeeded.
My personal experience was with a Mirth 4.1.0 instance (Temurin 17), in a channel having 20+ destinations, processing multiple messages per second, 24/7. Many destinations had complex transformers (multiple steps, hundred (if not thousand) of JavaScript code lines). I remember that I had a baby heart attack while browsing the code and configuration. Many things should have been done differently... A lot of copy/paste or "clone destination" stuff that probably should have been removed....
I also asked ChatGPT to help me reproduce the issue (starting threads in Transformers) but yet again, no luck...
@sbraconnier do you agree with closing this issue and #93 for now? I'll gladly reopen the issue if someone is encountering the error with current examples.
@tonygermano I guess it makes sense. I doubt tho that we'll find something better than the retry algorithm (if someone provides a new stack trace). The problem is still there but it's not bugging me anymore (for now).
Closing per discussion.
- linked a pull request that will close this issueFix intermittent ConcurrentModificationException (#92) #93
on Jun 28, 2026
Describe the bug
I personally experienced intermittent ConcurrentModificationException on heavy loaded channel. There is already some issues about this on the NextGen repo (see ConcurrentModificationException in global post processor and ConcurrentModificationException when using JS Writer).
To Reproduce
It's hard to reproduce, but you can visit the provided mirth issues for more details.
Expected behavior
Message.getMergedConnectorMessageshould be thread safe.Actual behavior
From time to time, a
ConcurrentModificationExceptionoccurs.Screenshots
NA
Environment (please complete the following information):
NA
Workaround(s)
There is no workaround.
Additional context
I'm is-simon now with my personnal github user (not working at "is" anymore).
I would be happy to work on this one. Should be easy enough...