Handler implementation notes
The Connectors will maintain a reference to the handler instances provided (either indirectly via the MBean proxy or directly via the instance object reference). For each request to the server invoker, the handler will be called upon. Since the server invokers can be multi-threaded (and in most cases would be), this means that the handler may receive concurrent calls to handle invocations. Therefore, handler implementations should take care to be thread safe in their implementations.