To enable cross domain access for JAX-RS services, we need to create filter which implements ContainerResponseFilter and then we also need to add ContainerResponseFilter object to the resourceconfig.

For the Starters JAX-RS: Java API for RESTful Web Services (JAX-RS) is a Java programming language API spec that provides support in creating web services according to the Representational State Transfer (REST) architectural pattern.[1] JAX-RS uses annotations, introduced in Java SE 5, to simplify the development and deployment of web service clients and endpoints.

The following code snippet below gives us how to achieve this.

• Step 1 : Create a class which implements ContainerResponseFilter, which contains

@Provider
@PreMatching
public class CorsFilter implements ContainerResponseFilter {
    private Log logger = LogFactoryUtil.getLog(getClass());
    @Override
    public void filter(final ContainerRequestContext requestContext, final ContainerResponseContext cres)
   throws IOException {
   logger.info("Writing CORS headers");
   cres.getHeaders().add("Access-Control-Allow-Origin", "*"); // Update specific domains instead of giving to all
   cres.getHeaders().add("Access-Control-Allow-Headers", "Origin,Content-Type,Accept,Authorization,content-type");
   cres.getHeaders().add("Access-Control-Allow-Methods", "GET,POST,PUT,DELETE,OPTIONS,HEAD");
   cres.getHeaders().add("Access-Control-Max-Age", "1209500");
    }
}

• Step 2: We need to add object of ContainerResponseFilter to resource config as below

@ApplicationPath("/org")
@Component(immediate = true, service = Application.class)
public class MclRestServiceApplication extends Application {
    @Override
    public Set<Object> getSingletons() {
   final Set<Object> singletons = new HashSet<>();
    	singletons.add(this);
// Giving cors filter object to the application/resource config
    	singletons.add(new CorsFilter());
    	return singletons;
    }
}

• Step 3:  Our module needs to be deployed to reflect the changes