JIRA: https://jira.spring.io/browse/INT-4363
The JIRA requests making the `MessageHandlerMethodFactory` a bean.
This is not possible without a major rework of the `MessagingMethodInvokerHelper`.
The problem is that the `InvokerHandlerMethod` s are created before the factory
is initialized. In fact, it only works at all since the IHMs have a hard reference
to the factory's argument resolvers so, when they are initialized in `initialize()`
each handler sees the resolvers.
This really needs to be improved but, since we are so close to GA, the compromise
was to add a `HandlerMethodArgumentResolversHolder` which holds the standard resolvers
which are then wired into the factory (along with the message converter).
Delaying the creation of the `InvokerHandlerMethod` is not trivial; today they are
built in the CTOR; moving it to `initialize()` would prevent the fast failure for
a badly configured bean; the proper solution might be to make the MMIHs beans themselves.
Polishing - PR Comments
986d5fc0cd