Details
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Bug
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Status: Resolved (View Workflow)
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Blocker
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Resolution: Fixed
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None
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Jenkins 2.134
mqtt-notification-plugin 1.7
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mqtt-notification-plugin 1.8.0
Description
We observed unexplainable OutOfMemoryExceptions in arbitratry places around Jenkins. After some investigation with Jconsole, we noticed, what seems to be a memory leak. The thread overview shows a very high number of unclosed MQTT related threads. We therefore assume MQTT threads are created but never closed?
Security Breach
Attachments
Activity
After investigating the source code:
The mqtt client must be closed in a finally block in both: the perform() method and the doTestConnection() method. Doing this resolves the problem in our local environment.
With the next release MqttClient will implement AutoClosable, which should help resolve this even cleaner.
https://github.com/eclipse/paho.mqtt.java/pull/448
Urs Lange
added a comment - - edited After investigating the source code:
The mqtt client must be closed in a finally block in both: the perform() method and the doTestConnection() method. Doing this resolves the problem in our local environment.
With the next release MqttClient will implement AutoClosable, which should help resolve this even cleaner.
https://github.com/eclipse/paho.mqtt.java/pull/448 
Thanks for reporting the issue and doing the analysis up_lange! i completely forgot about this issue, but a recent PR has fixed it so i'll get a new version released soon (though i guess it's probably too late in your case).