</> MV Techbytes

Generally bottom up approach, where the service implementation is done first and wsdl will be generated next, is not a suggested way of implementing a web service. In some cases where the service implementation class is already exists in the application and wants to expose it as web service then it is acceptable to go with bottom up approach.

In this post, I would like to show how the web service can be developed in bottom up approach using the wsgen command.

The wsgen tool reads an existing web service implementation class and generates the required JAX–WS portable artifacts for web service development and deployment. The wsgen tool can be used for bottoms-up approach, where you are starting from a service endpoint implementation rather than a wsdl. The generated JAX-WS artifacts can be used by both service and client implementations.

Below is the sample service class created – HellowWorldService.java

package in.malliktalksjava.service;

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

@WebService(name=”HellowWorldService”,
targetNamespace=”http://malliktalksjava.in&#8221;,
wsdlLocation=”http://localhost:8085/HellowWorldService?wsdl&#8221;)
public class HellowWorldService{

@WebMethod
public void printHelloMessage(){
System.out.println(“Printing hello message”);
};

@WebMethod
public String getThankyouMessage(){
System.out.println(“Printing thank you message”);

return null;
};

}

Compile the java classes using below command:

javac -d . in/malliktalksjava/service/*.java

Once the compilation is successful, use the below wsgen command to generate the artifacts:

wsgen -verbose -keep -cp . in.malliktalksjava.service.HellowWorldService

Once click on the enter button, below are the artifacts generated in jaxws folder:

in\malliktalksjava\service\jaxws\GetThankyouMessage.java
in\malliktalksjava\service\jaxws\GetThankyouMessageResponse.java
in\malliktalksjava\service\jaxws\PrintHelloMessage.java
in\malliktalksjava\service\jaxws\PrintHelloMessageResponse.java

If it is required to generate the wsdl file along with the artifacts, we need to use the below command:

wsgen -verbose -keep -cp . -wsdl in.malliktalksjava.service.HellowWorldService

Below are the list of options available in wsgen command: