Hi!! Agreed with Justin about not being a real issue.. Check the last comment here: https://github.com/netty/netty/issues/2522 You could try to put a FastThreadLocal.destroy() on the application exit. Anyway, there are good chances that the memory leak protection (https://wiki.apache.org/tomcat/MemoryLeakProtection) of Tomcat will recognize it as a memory leak because you'll need a complete GC cycle to get rid of the thead local instances.
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