5.2.7 ExecutorEndpoint instances can be configured with a java.util.concurrent.Executor. The executor will
then be used to dispatch any incoming requests to the application. The setExecutor and getExecutor
methods of Endpoint can be used to modify and retrieve the executor configured for a service.
Conformance (Use of Executor): If an executor object is successfully set on an Endpoint via the set-
Executor method, then an implementation MUST use it to dispatch incoming requests upon publication of
the Endpoint by means of the publish(String address) method. If publishing is carried out using
the publish(Object serverContext)) method, an implementation MAY use the specified executor or
another one specific to the server context being used.

Conformance (Default Executor): If an executor has not been set on an Endpoint, an implementation
MUST use its own executor, a java.util.concurrent.ThreadPoolExecutor or analogous mechanism,
to dispatch incoming requests.