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Code Block

	XML
	XML
borderStyle	solid
title	ejb-jar.xml

<?xml version="1.0" encoding="UTF-8" ?> 
<ejb-jar xmlns="http://java.sun.com/xml/ns/javaee" version="3.0" 
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
             http://java.sun.com/xml/ns/javaee/ejb-jar_3_0.xsd">
  <description>Stateless Session Bean Example</description> 
  <display-name>Stateless Session Bean Example</display-name> 
 <enterprise-beans>
   <session>
     <ejb-name>RetrieveOrderInfoBean</ejb-name>
     <business-local>
         examples.session.stateless_dd.RetrieveOrderInfo
     </business-local>
     <ejb-class>
         examples.session.stateless_dd.RetrieveOrderInfoBean
     </ejb-class> 
     <session-type>Stateless</session-type> 
     <transaction-type>Container</transaction-type> 
 
	  <resource-ref>
		<res-ref-name>
                  jdbc/DB2DataSource
                </res-ref-name>
		<res-type>
                  javax.sql.DataSource
                </res-type>
		<res-auth>Container</res-auth>
		<res-sharing-scope>
                  Shareable
                </res-sharing-scope>
	  </resource-ref>
		 
	 
   </session>
 </enterprise-beans>
 
 <interceptors>
   <interceptor>
       <interceptor-class>
         examples.session.stateless_dd.RetrieveOrderCallbacks
       </interceptor-class>
       <post-construct>
         <lifecycle-callback-method>
            construct
         </lifecycle-callback-method>
       </post-construct>
       <pre-destroy>
          <lifecycle-callback-method>
              destroy
          </lifecycle-callback-method>
       </pre-destroy> 
    </interceptor>
  </interceptors> 
  
  <assembly-descriptor>
    <interceptor-binding>
      <ejb-name>RetrieveOrderInfoBean</ejb-name>
      <interceptor-class>
        examples.session.stateless_dd.RetrieveOrderCallbacks
      </interceptor-class>
    </interceptor-binding>  
  </assembly-descriptor>  
</ejb-jar>

The deployment descriptor of the OrderWEB.war is as followsIn the RetrieveOrderInfoBean, the following code is used to look up the Datasource object and obtain a database connection.

Code Block

	XMLJAVAXML
	JAVA
borderStyle	solid
title	web.xml	examples.session.stateless_dd.RetrieveOrderInfoBean


Context initContext = new InitialContext();
Context envContext  = (Context)initContext.lookup("java:comp/env");
DataSource ds = (DataSource)envContext.lookup("jdbc/DB2DataSource");
System.out.println("Got DataSource\n");
con = ds.getConnection();
System.out.println("Got Connection\n");

The deployment descriptor of the OrderWEB.war is as follows.

Code Block

	XML
	XML
borderStyle	solid
title	web.xml


<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
     
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
     xmlns="http://java.sun.com/xml/ns/javaee" 
     xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"  
     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
      http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" 
     id="WebApp_ID" 
     version="2.5">
  <display-name>OrderWEB</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <servlet>
    <description></description>
    <display-name>RetrieveOrder</display-name>
    <servlet-name>RetrieveOrder</servlet-name>
    <servlet-class>
       examples.web.servlet.RetrieveOrder
    </servlet-class>
  </servlet>
  <ejb-local-ref>
  	<ejb-ref-name>ejb/RetrieveOrderInfo
        </ejb-ref-name>
  	<ejb-ref-type>Session</ejb-ref-type>Session<type>
  	<local>
         examples.session.stateless_dd.RetrieveOrderInfo
        </local>
  	<ejb-link>RetrieveOrderInfoBean</ejb-link>
  </ejb-reflocal-type>ref>
  	<local><servlet-mapping>
    <servlet-name>RetrieveOrder</servlet-name>
    <url-pattern>/RetrieveOrder</url-pattern>
  examples.session.stateless_dd.RetrieveOrderInfo
        </local>
  	<ejb-link>RetrieveOrderInfoBean</ejb-link>
  </ejb-local-ref>
  <servlet-mapping>
    <servlet-name>RetrieveOrder</servlet-name>
    <url-pattern>/RetrieveOrder</url-pattern>
  </servlet-mapping>
</web-app></servlet-mapping>
</web-app>

In the RetrieveOrder servlet, the following code is used to look up the ejb to retrieve the order details.

Code Block

	JAVA
	JAVA
borderStyle	solid
title	examples.web.servlet.RetrieveOrder


Context ctx  = new InitialContext();
System.out.println("Instantiating beans...");
retrieveOInfo = (RetrieveOrderInfo)ctx.lookup("java:comp/env/ejb/RetrieveOrderInfo");
String orderIdStr = request.getParameter("orderid");
int orderId = Integer.parseInt(orderIdStr);
OrderInfo oInfo = retrieveOInfo.getOrderInfo(orderId);

The deployment descriptor of the Order.ear is as follows.

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