Apache Axis2 - Hello World!

Apache Axis2 is a SOAP processing engine and its main function is to deliver incoming SOAP messages into target applications, and in this context application is a Web service. This tutorial provides step by step guidance on how to create your first Hello World application.

Prerequisite:

• Java Development Kit (Follow this link to install on Ubuntu)
• Apache Axis2 (Follow this link to setup on Ubuntu)

Step 1:
Create a new class HelloService as shown below.

public class HelloService {

    /**
    * This method will be the add operation of the web service.
    */
    public int add(int x, int y) {
        int ans = x + y;
        return ans;
    }

}

Step 2:
Create a new services.xml as shown below.

<service>
 <parameter locked="false" name="ServiceClass">HelloService</parameter>
 <operation name="add">
  <messageReceiver class="org.apache.axis2.rpc.receivers.RPCMessageReceiver"/>
 </operation>
</service>

In this xml file, HelloService is your class name and the operation name is the name of your method.

Step 3:
Compile the  HelloService.java.

Step 4:
Create a folder named service and store the HelloService.class directly inside that folder and the services.xml under service/META-INF directory.

service
    |-- HelloService.class
    |-- META-INF
            |-- services.xml

Step 5:
Open the terminal in the service directory and enter the following command. It will create a HelloService.aar file in the service directory.

jar -cvf HelloService.aar *

Step 6:
Copy the HelloService.aar to $AXIS2_HOME/repository/services directory.

Step 7:
Run Axis2 Server by running the following command.
Linux users:

sh $AXIS2_HOME/bin/axis2server.sh

Windows users:

%AXIS2_HOME%\bin\axis2server.bat

After the Axis2 server is up and running, visit to http://localhost:8080/axis2/services/ in your browser. You will see the available services listed there including HelloService. Now your web service is ready to service the client requests.

Step 9:
From this step onwards, we will create a client for our HelloService. Create a new folder Client, open the terminal in that folder and run this command.
Linux users:

sh $AXIS2_HOME/bin/wsdl2java.sh -uri http://localhost:8080/axis2/services/HelloService?wsdl -o .

Windows users:

%AXIS2_HOME%\bin\wsdl2java.bat -uri http://localhost:8080/axis2/services/HelloService?wsdl -o .

This command will create the client side stub and holder classes for the HelloService.

Step 10:

Open the src folder which is created in Step 9 and create a new class Client.java inside that folder.

import org.apache.ws.axis2.*;

public class Client {

    public static void main(String[] args) throws Exception {
        // Create the stub object
        HelloServiceStub stub = new HelloServiceStub();

        // Create the request
        HelloServiceStub.Add request = new HelloServiceStub.Add();

        // Set the parameters
        request.setArgs0(10);
        request.setArgs1(20);

        // Invoke the service
        HelloServiceStub.AddResponse response = stub.add(request);
        int ans = response.get_return();    // 10 + 20 = 30
        System.out.println("Response : " + ans);
    }

}

This client sends number 10 and 20 to the HelloService add method and prints the response received from that service.

Step 11:

Compile and run the Client using the following commands from src folder.

Linux users:

javac -cp .:$AXIS2_HOME/lib/* Client.java

java -cp .:$AXIS2_HOME/lib/* Client

Windows users:

javac -cp .;%AXIS2_HOME%/lib/* Client.java

java -cp .;%AXIS2_HOME%/lib/* Client

You must see an output saying Response: 30.

Find the code at Git Hub.

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