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What does appdynamics.agent.disable.retransformation means?
I read a suggestion to switch it on for workaround a JVM GC crash problem.
But I cannot found any further information about this switch.
From the property name, I guess this is related to the on-the-fly agent retransform the byte code after BT configured via controller. Can I gather this kind of transformation activities from AD agent logs?
You are spot on; with this property set, the agent will not transform classes other than on their initial load.
You can see precisely what classes are transformed in the agent's ByteCodeTransformer log.
In general, I would recommend upgrading to the latest JVM version as the first recourse toward fixing JVM crash issues, wherever possible.