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Type: Bug
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Resolution: Done
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Priority: Major - P3
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Affects Version/s: 2.12.0
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Component/s: Cluster Management
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None
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Fully Compatible
Quoting from Stefan's comment:
The problem is how BaseCluster.random is initialized to a ThreadLocal subclass instance. That class references the webapp's classloader. The ThreadLocal subclass in turn is referenced by each Thread instance (that's how ThreadLocals are implemented, they have a "helper-Map" in each Thread instance, so the leak is actually not a tiny Random instance but the whole webapp's classloader with a bunch of class definitions and statically referenced parts of the webapp