Remote Listeners uses compat mode checks in plenty of places to convert between storage and pojo format, and apart from that, there is a cache manager wide "event marshaller" used to unmarshal params for filters used in events, falling back to GenericJbossMarshaller when the marshaller is not set.

It should not use a global marshaller and should not hardcode JbossMarshaller, instead the remote listener themselves should have a mechanism of choosing the format of the data, similar to "useRawData" (where one can choose to receive events in a marshalled or unmarshaled way). One way of doing it is to supply a MediaType in the listener with the desired format.