How to write a dynamic client for a web service in Apache Axis 2

In Apache Axis2, the are several ways to write a client for a web service. One approach would be to use WSDL2Java, the code generation tool provided with Axis2 generate a stub for the web service and use that stub to consume the web service. Other option is to write a dynamic client. This is how you can write a dynamic client for a web service.

We will you expose a simple POJO as a web service.

package org.wso2.training;

public class CalculatorService {
  
   public int add (int a, int b) {
       return a + b;
   }
  
   public int multiply(int a, int b) {
       return a * b;
   }
  
}

Exposing this as a web service is a matter of 2 lines of code ...

    AxisServer axisServer = new AxisServer();
    axisServer.deployService(CalculatorService.class.getName());

Now, the WSDL for this web service will be available at

http://localhost:6060/axis2/services/CalculatorService?wsdl

Now let's see how we can write a dynamic client for this web service

        //Create a service client for given WSDL service by passing the following four parameters
        //ConfigurationContext - we keep it as null
        //wsdlURL - The URL of the WSDL document to read
        //wsdlServiceName The QName of the WSDL service in the WSDL document 
        //portName        The name of the WSDL 1.1 port to create a client for. 
        
        RPCServiceClient dynamicClient = new RPCServiceClient(null, new URL(
                "http://localhost:6060/axis2/services/CalculatorService?wsdl"), new QName(
                "http://training.wso2.org", "CalculatorService"),
                "CalculatorServiceHttpSoap12Endpoint");

        // We provide the parameters as an object array and return types as an class array
        Object[] returnArray = dynamicClient.invokeBlocking(new QName("http://training.wso2.org","add"),
                new Object[] { 1, 2 }, new Class[] { Integer.class });
        
        System.out.println("1 + 2 = " + returnArray[0]);
        
        returnArray = dynamicClient.invokeBlocking(new QName("http://training.wso2.org","multiply"),
                new Object[] { 1, 2 }, new Class[] { Integer.class });
        
        System.out.println("1 X 2 = " + returnArray[0]);

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