Basic web service implementation

This post describes how to implement a simple webservice using Weblogic, Eclipse, and Apache Axis. We will go through these steps to implement the Webservice

1. Enable Weblogic domain for WebServices
2. Create a simple web service class.
3. Auto-generate WebServices classes in Eclipse
4. Auto-generate the classes for calling the web service.
5. Create a Client Application

1. Enable Weblogic domain for WebServices: Follow these steps to enable your weblogic domain for web services.
   1. Start the Configuration Wizard (c:/bea9.2/weblogic92/common/bin/config.cmd)
   2. In the Welcome window, select Extend an Existing WebLogic Domain. Click Next.
   3. Select the domain to which you want to apply the extension template. Click Next.
   4. Select Extend My Domain Using an Existing Extension template.
   5. Enter the following value in the Template Location text box: WL_HOME/common/templates/applications/wls_webservice.jar. Click Next.
   6. Select no. Click next.
   7. Verify that you are extending the correct domain, then click Extend.
2. Create a simple web service class: Create an Eclipse Web Project. The reason for using a Web Project is that the J2EE specification requires that for implementing you need one of the following.
   • A Java class running in the Web container.
   • A stateless session EJB running in the EJB container.
   Create the following class within the web application.

   public class TestService {
   public String sayHello(String message) {
   System.out.println("sayHello:" + message);
   return "You said '" + message + "'";
   }
   }

   TestService.java
3. Auto-generate WebServices classes in Eclipse: Right-click on the TestService.java class and select Web Services->Create Web Service. If you have a weblogic server defined in eclipse, then the Web service will be automatically published to the server. Make sure that your server definition looks like this.
4. Auto-generate the classes for calling the web service: Create a Java application and copy the generated WSDL file from the web project. Right-click on the WSDL file and Web Services->Generate client. All the required classes will be generated, and the jar files will also be imported.
5. Create a Client Application: We will use a simple Java client for this web service. The following is the code for the client application.

   import java.rmi.RemoteException;
   import service.TestService;
   import service.TestServiceProxy;
   public class SimpleClient {
   public static void main(String[] args) {
   TestService service = new TestServiceProxy();
   try {
   System.out.println(service.sayHello("Hello"));
   } catch (RemoteException e) {
   e.printStackTrace();
   }
   }
   }

This example was run on Weblogic 9.2, Eclipse Callisto 3.2, Java 5.0.