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Tuesday, November 13, 2012

Web Service using JAX-WS (RPC Style)

12:17:00 AM Posted by Satish , , No comments
Here I will be creating a JAX-WS RPC style web service. RPC style web service is having lot of draw back as compared to the Document style web service. But to start with, I thought to give a simple example to understand how RPC style web service implemented in java. You can find the difference between RPC and Document style web services here.

For this tutorial I will be using the following tools

1. JDK 7
2. Eclipse Juno
3. Maven2

So let's start with some concept of JAX-WS before getting in to the code.

JAX-WS is bundled with JDK 1.6, which makes Java web service development easier to develop. This tutorial shows you how to do the following tasks:

1. Create a SOAP-based RPC style web service end point by using JAX-WS.
2. Create a Java web service client manually.

Before start coding let's create a java project using the following maven command.

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mvn archetype:generate -DgroupId=com.techiekernel -DartifactId=webservice-JAX-WS-RPC -Dpackagename=com.techiekernel

After you execute, the project will be get created with pom.xml file. As I am using JDK 7 and annotations, I have to specify the updated maven plugin. And I also specified a configuration for executable jar. So the final pom.xml is shown bellow.

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
 <modelVersion>4.0.0</modelVersion>
 <groupId>com.techiekernel</groupId>
 <artifactId>webservice-JAX-WS-RPC</artifactId>
 <packaging>jar</packaging>
 <version>1.0-SNAPSHOT</version>
 <name>webservice-JAX-WS</name>
 <url>http://maven.apache.org</url>
 <dependencies>
  <dependency>
   <groupId>junit</groupId>
   <artifactId>junit</artifactId>
   <version>3.8.1</version>
   <scope>test</scope>
  </dependency>
 </dependencies>
 <build>
  <plugins>
   <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-war-plugin</artifactId>
    <version>2.1.1</version>
   </plugin>
   <plugin>
    <artifactId>maven-compiler-plugin</artifactId>
    <configuration>
     <source>1.5</source>
     <target>1.5</target>
    </configuration>
   </plugin>
   <plugin>
    <!-- Build an executable JAR -->
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-jar-plugin</artifactId>
    <configuration>
     <archive>
      <manifest>
       <addClasspath>true</addClasspath>
       <classpathPrefix>lib/</classpathPrefix>
       <mainClass>com.techiekernel.ws.jaxws.rpc.FooBarPublisher</mainClass>
      </manifest>
     </archive>
    </configuration>
   </plugin>
  </plugins>
  <finalName>webservice-JAX-WS-RPC</finalName>
 </build>

</project>

JAX-WS Web Service End Point:

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package com.techiekernel.ws.jaxws.rpc;

import javax.jws.WebMethod;
import javax.jws.WebService;
import javax.jws.soap.SOAPBinding;
import javax.jws.soap.SOAPBinding.Style;

/**
 * Service end point interface
 * @author satish
 *
 */
@WebService
@SOAPBinding(style = Style.RPC)
public interface FooBar {
 @WebMethod
 String callFooBar(String name);
}

Web Service Endpoint Implementation:

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package com.techiekernel.ws.jaxws.rpc;

import javax.jws.WebMethod;
import javax.jws.WebService;

@WebService(endpointInterface = "com.techiekernel.ws.jaxws.rpc.FooBar")
public class FooBarImpl implements FooBar {

 @WebMethod
 public String callFooBar(String name) {
  // TODO Auto-generated method stub
  return "FooBar called by " + name;
 }

}

Endpoint Publisher:

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package com.techiekernel.ws.jaxws.rpc;

import javax.xml.ws.Endpoint;

/**
 * End point publisher
 * @author satish
 *
 */
public class FooBarPublisher {
 public static void main(String[] args) {
  System.out.println("main called");
  Endpoint.publish("http://localhost:8080/webservice-JAX-WS/foobar", new FooBarImpl());
 }
}

Once you run FooBarPublisher, the web service "foobar" will be ready with localhost and port 8080. You can curl the service at "http://localhost:8080/webservice-JAX-WS-RPC/foobar?wsdl" and can see the xml defination of the service.

Java Web Service Client:

 
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package com.techiekernel.ws.jaxws.rpc;

import java.net.MalformedURLException;
import java.net.URL;

import javax.xml.namespace.QName;
import javax.xml.ws.Service;

public class FooBarClient {
 public static void main(String[] args) {
  URL url = null;
  try {
   url = new URL("http://localhost:8080/webservice-JAX-WS-RPC/foobar?wsdl");
  } catch (MalformedURLException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }

  // 1st argument service URI, refer to wsdl document above
  // 2nd argument is service name, refer to wsdl document above
  QName qname = new QName("http://rpc.jaxws.ws.techiekernel.com/",
    "FooBarImplService");

  Service service = Service.create(url, qname);

  FooBar foobar = service.getPort(FooBar.class);

  System.out.println(foobar.callFooBar("Techie Kernel"));
 }
}

So now we are ready to test our webservice. We are going to do that in two steps.

1. Making the service ready by running the following command in target folder.

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java -jar webservice-JAX-WS-RPC.jar

2. Test the web service by running client.

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java com.techiekernel.ws.jaxws.rpc.FooBarClient

Output:

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FooBar called by Techie Kernel

Code Base:

You can pull the entire source code from GitHub.

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