Asynchronous request processing is another case in which a facility from Resteasy 2 has been formalized in JAX-RS 2.0. The result in Resteasy is quite similar to the old version. For example,

@Path("/")
public static class TestResource
{
   @GET
   @Produces("text/plain")
   public void test(@Suspend(2000) AsynchronousResponse response)
   {
      Thread t = new Thread()
      {
         @Override
         public void run()
         {
            try
            {
               System.out.println("STARTED!!!!");
               Thread.sleep(100);
               Response jaxrs = Response.ok().type("text/plain").build();
               response.setResponse(jaxrs);
            }
            catch (Exception e)
            {
               e.printStackTrace();
            }
         }
      };
      t.start();
   }
}
   

would be turned into

@Path("/")
public static class TestResource
{
   @GET
   @Produces("text/plain")
   public void get(@Suspended final AsyncResponse response)
   {
      response.setTimeout(2000, TimeUnit.MILLISECONDS);
      Thread t = new Thread()
      {
         @Override
         public void run()
         {
            try
            {
               System.out.println("STARTED!!!!");
               Thread.sleep(100);
               Response jaxrs = Response.ok().type("text/plain").build();
               response.setResponse(jaxrs);
            }
            catch (Exception e)
            {
               e.printStackTrace();
            }
         }
      };
      t.start();
   }
}
   

Other than the name changes, the one change to note is that the @Suspended annotation does not have a timeout field. Instead, the timeout can be set on the AsyncResponse.