DummyInvocationUtils's ThreadLocal cache causes classloader leak

[ajmurphy520]

If application is deployed to a standalone servlet container the the DummyInvocationUtils cache will cause a classloader leak. This is caused by the Cache being a ThreadLocal which results in the threads created by the container maintaining a reference to the cache and therefore the classloader. On a redeploy or restart of the application within the container those threads will remain which keeps the classlaoder from the previous instance alive.

To prevent classloader leaks, thread locals must be cleared at the end of the request.