Consume a web service from another web service

[florentine]

Hi all,

I'm new to the web service world so I apologize for my naive question.

I created a very basic web service that I am able to successfully call from a web client. What I want to do now is to create a second web service that uses the service exposed by the first one to provide its own functionality.

These are my classes/web services:

HelloWorld.java (External Web Service)
{code}
package hw1;
import javax.jws.WebService;
import javax.jws.WebMethod;
import javax.jws.soap.SOAPBinding;
import javax.jws.soap.SOAPBinding.Style;
@WebService
@SOAPBinding(style = Style.RPC)
public interface HelloWorld {
    @WebMethod String getHiWorld();
}
{code}

HelloWorldImpl.java
{code}
package hw1;
import hw2.HelloWorld2;
import javax.jws.WebMethod;
import javax.jws.WebService;
import javax.xml.ws.WebServiceRef;
@WebService(serviceName = "HelloWorldService", name = "HelloWorld")
public class HelloWorldImpl implements HelloWorld {
    @WebServiceRef(type = HelloWorld2.class)
      private HelloWorld2Service service;
    @Override
    @WebMethod
    public String getHiWorld() {
HelloWorld2 port = service.getHelloWorld2Port();

        return "Hi World" + port.getHiWorld();

    }

}
{code}

HelloWorld2.java (Internal Web Service)

{code}
package hw2;
import javax.jws.WebService;
import javax.jws.WebMethod;
import javax.jws.soap.SOAPBinding;
@WebService
@SOAPBinding(style=SOAPBinding.Style.RPC)
public interface HelloWorld2 {
    @WebMethod String getHiWorld();
} 
{code}

HelloWorld2Impl.java 
{code}
package hw2;
import javax.jws.WebMethod;
import javax.jws.WebService;
@WebService(serviceName="HelloWorld2Service", name="HelloWorld2")    
public class HelloWorld2Impl implements HelloWorld2 {
    @Override
    @WebMethod
    public String getHiWorld() {
            return " again!";
    }
public HelloWorld2Impl (){}
}
{code}

The error I get is that in HelloWorld.java, the HelloWorld2Service cannot be resolved to a type.

I am developing with Eclipse Indigo, I'm using JBOSS 7 AS, and I have the Java 1.7 installed on my pc.

Thanks in advance for any help or hint you can provide.

Filippo

[spyhunter99]

why not just call it via transport instead of by reference?

[spyhunter99]

you can also do a jdni lookup to get the reference

[florentine]

Thank you for you answer. I took a look at JNDI and it looks a lower level solution where you have to code more. I saw several examples on the internet on how to create a client for a web service and I can make them work also on my small piece of code above. The problem is that I can't make a web service calling another web service. It sounds to me a very basic functionality, but I was really able to find a complete example on how to do that. I tried to copy and paste the code of my client inside the HelloWorld.getHiWorld() method, but I keep getting a proxy error. How people normally make more webservices communicating between each other? any example from where I could get an idea?

This is my updated code with the client :

 HelloWorldImpl.java 
package hw1;
import hw2.HelloWorld2;
import java.net.MalformedURLException;
import java.net.URL;
import javax.jws.WebService;
import javax.xml.namespace.QName;
import javax.xml.ws.Service;
@WebService(serviceName="HelloWorldService", name="HelloWorld")
public class HelloWorldImpl implements HelloWorld   {
    @Override
    public String getHiWorld() {
        URL url=null;
        try {
            url = new URL("http://localhost:8080/HelloWorld2WS/HelloWorld2Service?wsdl");
        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        QName qname = new QName("http://hw2/", "HelloWorld2Service");
        Service    service = Service.create(url, qname);
        HelloWorld2 port = service.getPort(HelloWorld2.class);
        return "Hi World" + port.getHiWorld();
    }
    public HelloWorldImpl() {
    }
}

HelloWorld2Impl.java
package hw2;
import javax.jws.WebService;
 @WebService(serviceName="HelloWorld2Service", name="HelloWorld2")
public class HelloWorld2Impl implements HelloWorld2 {
    @Override
    public String getHiWorld() {
            return " again!";
     }
public HelloWorld2Impl (){}
}

HelloWorldClient.java
package client;
import hw1.HelloWorld;
import java.net.URL;
import javax.xml.namespace.QName;
import javax.xml.ws.Service;
public class HelloWorldClient {
    public static void main(String[] args) throws Exception {
        URL url = new URL("http://localhost:8080/HelloWorldWS/HelloWorldService?wsdl");
        QName qname = new QName("http://hw1/", "HelloWorldService");
        Service service = Service.create(url, qname);
        HelloWorld eif = service.getPort(HelloWorld.class);
        System.out.println(eif.getHiWorld());
    }
}

Finally, this is the error my JBoss server is giving me:

Exception in thread "main" javax.xml.ws.soap.SOAPFaultException: hw2/HelloWorld2
    at com.sun.xml.internal.ws.fault.SOAP11Fault.getProtocolException(SOAP11Fault.java:178)
    at com.sun.xml.internal.ws.fault.SOAPFaultBuilder.createException(SOAPFaultBuilder.java:111)
    at com.sun.xml.internal.ws.client.sei.SyncMethodHandler.invoke(SyncMethodHandler.java:108)
    at com.sun.xml.internal.ws.client.sei.SyncMethodHandler.invoke(SyncMethodHandler.java:78)
    at com.sun.xml.internal.ws.client.sei.SEIStub.invoke(SEIStub.java:129)
    at $Proxy19.getHiWorld(Unknown Source)
    at client.HelloWorldClient.main(HelloWorldClient.java:25)

Thank you!

[spyhunter99]

I do think sort of thing all the time, but always from wsdl first.

What version of the JDK are you using, and Jboss, and JbossWS.

I never use the Service API either. I always use the generated (from wsdl first) class that is annotated with @WebServiceClient

[florentine]

I'm using

• JBoss AS 7.1
• Java 1.7.0_02
• jbossws-cxf-client-4.0.1.GA.jar
• Eclipse Indigo

[spyhunter99]

I've made a working sample for you, wsdl first. source included. It's a netbeans project, but should be adaptable to eclipse

[genrosesusai]

I am using Jboss 7.1.1

I am unable to run the attached hello service successfully.

It gives the following exception:

15:20:50,458 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/HelloWorldJAXWS].[jsp]] (http--127.0.0.1-8080-1) Servlet.service() for servlet jsp threw exception: javax.xml.ws.WebServiceException: Port {http://www.examples.com/wsdl/HelloService}Hello_Port not found.
        at org.apache.cxf.jaxws.ServiceImpl.getPort(ServiceImpl.java:328)
        at org.apache.cxf.jaxws.ServiceImpl.getPort(ServiceImpl.java:319)
        at javax.xml.ws.Service.getPort(Service.java:99) [jboss-jaxws-api_2.2_spec-2.0.0.Final.jar:2.0.0.Final]
        at com.examples.wsdl.helloservice.HelloServiceClient.getHelloPort(HelloServiceClient.java:57) [classes:]

Could you show light on this. How to deploy hello.wsdl?

[spyhunter99]

I'm assuming that it deployed correctly. The most likely cause is in the HelloServiceClient.java, try changing the Hello_Port annotation to  Hello_PortType

I wrote the example using jbossws native on jbossas 5 and 6.