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Using EJBs with Axis


Read this article if you would like to learn how to use SOAP, WSDL, and the Web services stack with J2EE. The second of three parts, this section focuses on EJBs and Axis. It is excerpted from chapter 7 of the book Building Web Services with Java: Making sense of XML, SOAP, WSDL, and UDDI, written by Steve Graham et al. (Sams; ISBN: 0672326418).

Author Info:
By: Sams Publishing
Rating: 5 stars5 stars5 stars5 stars5 stars / 8
May 25, 2006
TABLE OF CONTENTS:
  1. · Using EJBs with Axis
  2. · Using EJBs from Axis
  3. · The Session Bean
  4. · The Deployment Unit
  5. · Exposing the EJBs via Axis

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Using EJBs with Axis - Exposing the EJBs via Axis
(Page 5 of 5 )

This EJB JAR can now be packaged together with Axis into an EAR application. Then the whole can be deployed and the resulting application will let you access these EJBs using SOAP/HTTP via Axis.

The first task is to package the Axis Web application as a WAR file:

cd axis11\webapps
<java_home>\bin\jar cf axis.war *.*

Doing so creates a Web Application aRchive (WAR) file containing the Axis code.

The next step is to create an application DD that packages Axis.WAR and the SkatesEJB.jar together into a single application, as shown here:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE application PUBLIC 
"-//Sun Microsystems, Inc.//DTD J2EE Application
1.3//EN" "http://java.sun.com/dtd/application_1_3.dtd"> <application id="SkatesTownEJBWS"> <display-name>Skates</display-name> <module id="EjbModule_skates"> <ejb>skatesejb.jar</ejb> </module> <module id="WebModule_Axis"> <web> <web-uri>axis.war</web-uri> <context-root>axis</context-root> </web> </module> </application>

Usually you'd use a tool from the application server to do this and package the resulting EAR file. The EAR file now contains the following:

  • skates.ear

  • axis.war

  • skatesejb.jar

  • META-INF/MANIFEST.MF

  • META-INF/application.xml

At this point we move away from pure interoperable J2EE and into the realm of a specific application server. The deployment tooling will augment skates.ear with server- specific files. For example, WebSphere Application Server will generate a number of additional classes and XML files that bind the EJBs we've written into the container. For the examples in this book, we used the latest available WebSphere Application Server—version 5.1, which is available for trial download on the Web (http://www-106.ibm.com/developerworks/websphere/ downloads/WASsupport.html).

WebSphere allows you to do this outside the runtime using the application assembly tool, and also from the administration console. Other application servers have appropriate methods (for example, BEA WebLogic server has an ejbdeploy tool).

Please come back next week for the conclusion of this article.


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