The goal of this lab is to develop a first example of a web service using Axis2. This is simply to display the famous: HELLO WORLD.

1. Define the following directory/file structure:
   

   - helloService   
      - META-INF
          - services.xml   
      - hello
          - HelloWorld.java

2. Define the HelloWorld.java service class:
   

   package hello;
    
   public class HelloWorld{
    
   	public String sayHello() {
   		return "Hello world!";
   	}
   }

3. Define the deployment file services.xml as follows:
   

   <service name="HelloWorldService" scope="application">
       <description>
          Hello World  Service
       </description>
       <messageReceivers>
           <messageReceiver  mep="http://www.w3.org/2004/08/wsdl/in-only" class="org.apache.axis2.rpc.receivers.RPCInOnlyMessageReceiver"/>
           <messageReceiver  mep="http://www.w3.org/2004/08/wsdl/in-out" class="org.apache.axis2.rpc.receivers.RPCMessageReceiver"/>
       </messageReceivers>
       <parameter name="ServiceClass">
           hello.HelloWorld
       </parameter>
   </service>

4. Compile your program with javac HelloWorld.java
5. Deploy the service on Axis2 by copying the helloService directory to AXIS2_HOME/repository/services/.
6. You are now able to see the HelloWorldService service in the list of Axis2 services accessible on the page with the following URL: http://localhost:8080/axis2/services/. If you click on the HelloWorldService service link, you will see the WSDL definition (automatically generated by Axis2) of your web service.
7. To run a method of your service and get the corresponding SOAP response, you type the following expression into your browser: http://localhost:8080/axis2/services/HelloWorldService/sayHello. Compared to the previous expression, you specify here the name of the method to be executed.