ContainerResponseFilter not working - resteasy

Question

In wildfly 8.1 with REST services, I wanted to implement CORS ContainerRequestFilter and ContainerResponseFilter.
My request filter is working properly but ContainerResponseFilter never gets loaded nor called
package org.test.rest;
import java.io.IOException;
import javax.ws.rs.container.ContainerRequestContext;
import javax.ws.rs.container.ContainerResponseContext;
import javax.ws.rs.container.ContainerResponseFilter;
import javax.ws.rs.container.PreMatching;
import javax.ws.rs.ext.Provider;
#Provider
#PreMatching // <-- EDIT : This was my mistake ! DO NOT ADD THIS
public class CorsResponseFilter implements ContainerResponseFilter {
public CorsResponseFilter() {
System.out.println("CorsResponseFilter.init");
}
#Override
public void filter(ContainerRequestContext req,
ContainerResponseContext resp) throws IOException {
System.out.println("CorsResponseFilter.filter");
resp.getHeaders().add("Access-Control-Allow-Origin", "*");
resp.getHeaders().add("Access-Control-Allow-Credentials", "true");
resp.getHeaders().add("Access-Control-Allow-Methods",
"GET, POST, DELETE, PUT");
resp.getHeaders().add("Access-Control-Allow-Headers",
"Content-Type, Accept");
}
}
This seems to me as a Wildfly / resteasy bug. Do you have another idea / am I missing something ?

Answer 1

You are mixing ContainerRequestFilter and ContainerResponseFilter in your question. As you want to send additional Headers to the client the ContainerResponseFilter is the right one.
The #PreMatching annotation can be applied to a ContainerRequestFilter "to indicate that such filter should be applied globally on all resources in the application before the actual resource matching occurs".
Adding it to a ContainerResponseFilter does not make sense. Just remove the annotation and your filter should work.