JAX-RS filters calling sequence - jaxb

Question

My implemention of the JAX-RS Filters as as follows,
The request filter is :
public class AuthorizationRequestFilter implements ContainerRequestFilter {
public static long entryTime;
#Override
public void filter(ContainerRequestContext requestContext)
throws IOException {
/*some preprocessing before unmarshalling*/
}
}
the Response filter is:-
public class ResponseFilter implements ContainerResponseFilter {
#Override
public void filter(ContainerRequestContext requestContext, ContainerResponseContext responseContext)
throws IOException {
if (!requestContext.getMethod().equalsIgnoreCase("Head")) {
/*Some processing after Marshalling*/
}
}
my handler is :-
#POST
#Path("abc")
#Produces(MediaType.APPLICATION_XML)
public Response createABC(App app){
/*lines of code*/
return Response.status(Status.CRETED).entity(abc).build();
}
My question is are the filters called after Marshallling and Unmarshalling,i.e is the app object created after the method AuthorizationRequestFilter and abc is Marshalled before calling of Response Filter

Answer 1

The request filter is called before unmarshalling. This should be apparent, as you still have access to the entity input stream (meaning it hasn't been read from yet). You could easily test this by writing a trivial MessageBodyReader. Set an arbitrary header in the request filter, then you will be able to extract the same header from the readers readFrom method.
The response filter will be called before the marshalling. Again this could easily be tested by writing a trivial MessageBodyWriter. Set an arbitrary header in the filter, and you should be able to access it in the writer's writeTo method.
If you want to perform some operation after marshalling, you instead could use a WriterInterceptor, which wraps the call the writer's marshalling method. For example
#Provider
public class SimpleIntercetor implements WriterInterceptor{
#Override
public void aroundWriteTo(WriterInterceptorContext context)
throws IOException, WebApplicationException {
// Processing before marshalling
context.proceed(); // marshal
// Processing after marshalling
}
}
Some Resources:
How to Write Custom Entity Providers
Interceptors
The links are to Jersey documentation, but interceptors, readers, writers are standard to JAX-RS 2.0, so the documentation should be applicable to whatever implementation you're using (for the most part :-)