topic Why doesn't this REST service work? in Talend Studio

Why doesn't this REST service work?

Anonymous — Sat, 16 Nov 2024 12:03:12 GMT

Trying to create a proof-of-concept REST service bundle.
It compiles fine.
Karaf starts the bundle with no errors.
But when I go the the URL where it should be, I get no response, and no errors in the log. Nothing.
here's the Interface:

@Path("greeter")
public interface Greeter {
    
    @GET
    @Path("greet/{name}")
    @Produces(MediaType.TEXT_PLAIN)
    public String greeter(@PathParam("name") String name);
    
}

The implementation:

public class GreeterImpl implements Greeter {
    
    public String greeter(String name) {
        return "hello "+name;
    }
    
}

The bundle activator:

public class Activator implements BundleActivator {
    private ServiceRegistration registration;
    public void start(BundleContext bc) throws Exception {
        Dictionary props = new Hashtable();
        props.put("service.exported.interfaces", "*");
        props.put("service.exported.configs", "org.apache.cxf.rs");
        props.put("service.exported.intents", "HTTP");
        props.put("org.apache.cxf.rs.address", "http://0.0.0.0:9118/");
        
        registration = bc.registerService(Greeter.class.getName(), new GreeterImpl(), props);
        
        System.out.println("CXF REST Test: http://0.0.0.0:9118/");
    }
    public void stop(BundleContext bc) throws Exception {
        registration.unregister();
    }
    
}

When I go to this URL:
http://localhost:9118/greeter/greet/miles
I get nothing. This is in Talend ESB 5.2.2. What am I doing wrong?

Re: Why doesn't this REST service work?

Anonymous — Fri, 19 Apr 2013 10:20:32 GMT

Hi - I think you are going the DOSGi path and we do not support it in ESB AFAIK.
Please have a look at /examples/cxf/jaxrs-intro/services, check how Blueprint context (in resources/OSGI_INF) can be used to activate an endpoint.

Re: Why doesn't this REST service work?

Anonymous — Fri, 19 Apr 2013 15:17:18 GMT

Thank you for you help sberyozkin, yes, I was using a DOSGi example from the web.
Basically, I'm trying to build some services using JAX annotation and no configuration files, like I can do on TomEE.
So I looked up the example you mentioned and made these changes to my Greeter service:
1. Removed the Activator class.
2. copied the service.xml file from example to my src/main/java/resources/OSGI-INF/blueprint directory in my Maven project, with the changes below.
3. removed reference to bundle activator in my pom.xml file.
src/main/java/resources/OSGI-INF/blueprint/service.xml:

     <jaxrs:server id="greeterService" address="/cxf">
        <jaxrs:serviceBeans>
           <ref component-id="greeterBean" />
        </jaxrs:serviceBeans>
     </jaxrs:server>
     <bean id="greeterBean" class="com.cn.dsa.greet.GreeterImpl"/>

The builds with no errors, and karaf launches it with no errors.
But again, there is no service at the URL.
I've tried:
http://localhost:8040/services/cxf/greeter/greet/miles
and
http://localhost:8040/cxf/greeter/greet/miles

If I go here:
http://localhost:8040/services/
it says "No services have been found" so are there a few more things I need to do?

Re: Why doesn't this REST service work?

Anonymous — Fri, 19 Apr 2013 23:33:49 GMT

I have the service working now with blueprint.
The problem was that the @Path attribute value must start with a slash. That was it.

@Path("/greeter")
public interface Greeter {
    
    @GET
    @Path("greet/{name}")
    @Produces(MediaType.TEXT_PLAIN)
    public String greeter(@PathParam("name") String name);
    
}