Network Deployment (Distributed operating systems), v8.0 > End-to-end paths > Web services


Implement web services applications from existing WSDL files with JAX-RPC

We can develop a web service with an existing WSDL file using JAX-RPC.

IBM WAS supports the JAX-WS programming model and JAX-RPC. JAX-WS is the next generation web services programming model extending the foundation provided by JAX-RPC. Using the strategic JAX-WS programming model, development of web services and clients is simplified through support of a standards-based annotations model. Although JAX-RPC and applications are still supported, take advantage of the easy-to-implement JAX-WS programming model to develop new web services applications and clients. bprac

Locate the WSDL file that defines the web service to implement. We can develop a WSDL or obtain one from an existing web service through email, downloading or a Uniform Resource Locator (URL).

To develop web services based on JAX-RPC, you can use a bottom-up development approach starting from existing JavaBeans or enterprise beans or you can use a top-down development approach starting with an existing WSDL file. This task describes the steps when using the top-down development approach.

When developing a JAX-RPC web service starting from an existing WSDL file, create the JavaBeans or enterprise bean and artifacts that enable the bean as web services and assemble all artifacts that are required for the web service, and deploy the application onto the application server.

Considerations when using JavaBeans

JavaBeans exposed as JAX-RPC web services are supported only over an HTTP transport.

Considerations when using enterprise beans

  • The enterprise bean must be a stateless session bean.

  • Enterprise beans that are exposed as JAX-RPC web services must be packaged in EJB 2.1 or in EJB 3.0 or higher modules.

  • For JAX-RPC web services using EJB 2.1 style endpoints, the Web service method parameters must be one of the supported JAX-RPC types. These requirements are documented in the JAX-RPC specification.
  • JAX-RPC web services using enterprise beans are supported over an HTTP or JMS transport.

It is a best practice to use EJB 2.1 style enterprise beans with JAX-RPC applications. bprac


Procedure

  1. Set up a development environment for web services. You do not have to set up a development environment if you are using Rational Application Developer.
  2. Develop the Java artifacts from a WSDL file. You need to create the deployment descriptor templates and bindings that are configured to map the service implementation to the JavaBeans or enterprise beans implementation.

  3. Complete the implementation of your web service application.

  4. Configure the webservices.xml deployment descriptor. For JAX-RPC web services, configure the webservices.xml deployment descriptor so that the application server can process the incoming web services requests.
  5. Configure the ibm-webservices-bnd.xmi deployment descriptor. Configure the ibm-webservices-bnd.xml deployment descriptor so that the application server can process the incoming web services requests.
  6. Assemble the artifacts for your web service.

    Use assembly tools provided with the application server to assemble your Java-based web services modules.

    If we have assembled an Enterprise Archive (EAR) file that contains enterprise beans modules that contain Web services, use the endptEnabler command-line tool or an assembly tool before deployment to produce a web services endpoint WAR file. This tool is also used to specify whether the web services are exposed using SOAP over JMS or SOAP over HTTP.

  7. Deploy the EAR file into the application server. We can now deploy the EAR file that has been configured and enabled for JAX-RPC web services onto the application server.


Results

You have developed a JAX-RPC web service application by starting with an existing WSDL file.


What to do next

After you deploy the EAR file, test the web service to make sure that it works with the application server.


Related


Develop Java artifacts for JAX-RPC applications from a WSDL file
Develop EJB implementation templates and bindings from a WSDL file for JAX-RPC web services
JAX-RPC
Web services
Set up a development environment for web services
Complete the JavaBeans implementation for JAX-RPC applications
Complete the EJB implementation for JAX-RPC applications
Configure the webservices.xml deployment descriptor for JAX-RPC web services
Configure the ibm-webservices-bnd.xmi deployment descriptor for JAX-RPC web services
Assembling web services applications
Assembling a WAR file that is enabled for web services from Java code
Assembling a web services-enabled WAR into an EAR file
Deploy web services applications onto application servers
Test web services-enabled clients
Use HTTP to transport web services
Use SOAP over JMS to transport web services


Related


Artifacts used to develop web services
Web services specifications and APIs

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