3eedda6c9d
Fixes https://github.com/spring-projects/spring-integration/issues/3223 The `json__TypeId__` header may have a value which cannot be resolved to the `Class` in the current classpath So, skip `ResolvableType` building logic until we really sure that end-user wants to map JSON headers * WARN a build exception that we can't load a class for the `json__TypeId__` when we try to build a `ResolvableType` in the `DefaultAmqpHeaderMapper` * Document the negation feature for JSON headers **Cherry-pick to 5.2.x**