[CXF-6929] Request hangs when using JAX-RS AsyncResponse and Exception mapper

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Not A Bug
• Affects Version/s: 3.1.1, 3.1.6
• Component/s: JAX-RS
• Estimated Complexity: Unknown
• Assignee: Unassigned
• Reporter: Florian Diebold
• Created: 02/Jun/16 19:37
• Updated: 21/Oct/16 18:50
• Resolved: 20/Jun/16 16:33

Description

I have a JAX-RS resource which takes an AsyncResponse, but immediately throws an exception before returning from the function. If the exception is then mapped by an ExceptionMapper, the response seems to be never sent, and the request hangs (stays suspended forever). Am I doing something wrong?

Example code:

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.container.AsyncResponse;
import javax.ws.rs.container.Suspended;
import javax.ws.rs.core.Response;
import javax.ws.rs.ext.ExceptionMapper;

import org.apache.commons.lang.NotImplementedException;
import org.apache.cxf.jaxrs.servlet.CXFNonSpringJaxrsServlet;
import org.eclipse.jetty.server.Connector;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.ServerConnector;
import org.eclipse.jetty.servlet.ServletContextHandler;
import org.eclipse.jetty.servlet.ServletHolder;

public class ServerDemo2 {
    public static void main( final String[] args ) throws Exception {
        final Server server = new Server();
        final ServerConnector connector = new ServerConnector( server );
        connector.setHost( "localhost" );
        connector.setPort( 8888 );
        server.setConnectors( new Connector[] { connector } );
        final ServletContextHandler handler = new ServletContextHandler();
        final ServletHolder holder = new ServletHolder( CXFNonSpringJaxrsServlet.class );
        holder.setInitParameter( "jaxrs.serviceClasses", Resource.class.getName() );
        holder.setInitParameter( "jaxrs.providers", Mapper.class.getName() );
        handler.addServlet( holder, "/*" );
        server.setHandler( handler );
        server.start();

        System.in.read();

        server.stop();
    }

    public static class Mapper implements ExceptionMapper<NotImplementedException> {
        @Override
        public Response toResponse( final NotImplementedException exception ) {
            exception.printStackTrace();
            return Response.ok().build();
        }
    }

    @Path( "/" )
    public static class Resource {
        @GET
        @Path( "/foo" )
        @Produces( "text/plain" )
        public void foo( @Suspended final AsyncResponse response ) {
            throw new NotImplementedException( "foo" );
        }

        @GET
        @Path( "/bar" )
        @Produces( "text/plain" )
        public void bar( @Suspended final AsyncResponse response ) {
            throw new RuntimeException( "bar" );
        }
    }
}

curl localhost:8888/foo hangs forever; curl localhost:8888/bar does not.