CODEWITHSUNDEEP
javajakarta-eejax-rsresteasy
László Stahorszki
László Stahorszki

Reputation: 1216

Intercept Jax-RS method invocation

I'd like to intercept every method call for methods that are annotated with @HttpMethod or some sub-annotation of that.

It isn't convenient for me to create an annotation, that I put on every method that can be invoked by Jax-RS, so I turned to WriterInterceptor and ReaderInterceptor.

However, these aren't what I'm looking for, since I'd like it to intercept the method invocation, instead of the reading/writing process.

Filters are not good enough since I don't get to catch exceptions thrown by the method.

The first solution (plain java-ee interceptor) would be the best option if I didn't have to annotate every method with an arbitrary annotation.

What other options do I have?

Upvotes: 0

Views: 657

Answers (1)

stdunbar
stdunbar

Reputation: 17435

This may be container specific but on at least Wildfly 18 I think I can do what you want. I'm using a servlet filter and pure JAX-RS - nothing RestEasy specific (nor Spring). My Application code does:

@ApplicationPath("/rest")
public class RestApplicationConfig extends Application {
    // intentionally empty
}

My Filter is:

@WebFilter(urlPatterns = "/rest/*")
public class FilterTest implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) {

        try {
            filterChain.doFilter(servletRequest, servletResponse);
        }
        catch( Throwable t ) {
            // handle exception
        }
    }
}

Note that I do a try/catch around the doFilter call. This is where you can catch any exceptions. An interesting addition is that I have a ContainerRequestFilter also:

@Provider
@Priority(Priorities.AUTHENTICATION)
@PreMatching
public class AuthContainerRequestFilter implements ContainerRequestFilter {

    @Override
    public void filter(ContainerRequestContext containerRequestContext) throws IOException  {
    }
}

and the catch in the Filter is not called until this code runs in Wildfly. That makes sense as this is the JAX-RS part.

My "service" is just:

@Path("/v1/exception")
public class ExceptionService {
    @Produces({ MediaType.TEXT_PLAIN })
    @GET
    public Response getException() {
        throw new InternalError("this is an internal error");
    }
}

Upvotes: 1

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