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Resteasy has the capability to intercept JAX-RS invocations and route them through listener-like objects called interceptors. There are 4 different interception points on the serverside: wrapping around MessageBodyWriter invocations, wrapping around MessageBodyReader invocations, pre-processors the intercept the incoming request before anything is unmarshalled, and post processors which are invoked right after the JAX-RS method is finished. On the client side you can also intercept MessageBodyReader and Writer as well as the remote invocation to the server.