barcode 128 generator vb.net Distinguish Between Stateful and Stateless Session Beans in Java

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Distinguish Between Stateful and Stateless Session Beans
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The following illustration shows how a client will view the remote interface.
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4. Create Deployment Descriptors A deployment descriptor, located within a Java Archive (JAR) file, allows the properties of an EJB to be maintained outside of Java code. It allows the bean developer to make information about the bean available to the application assembler and the bean deployer. A deployment descriptor also provides runtime information used by the EJB container. The EJB specification is specific with regard to the content and format of deployment descriptors. The deployment descriptor, written in XML, contains the structural information about the EJB, such as the relative path and name of the bean class file, remote interface, and home interface, as well as the state management type and the transaction management type. The deployment descriptor file may also contain optional information pertaining to multiple role names, environment entries, and data-source references. Note that all of the attributes of the bean are contained within XML tags. Here is our deployment descriptor for the stateless session bean:
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< xml version="1.0" encoding="UTF-8" > <!DOCTYPE ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN" "http://java.sun.com/dtd/ejb-jar_2_0.dtd"> <ejb-jar> <enterprise-beans> <session> <display-name>SLSession</display-name> <ejb-name>SLSession</ejb-name> <home>javaee.architect.SLSession.SLSessionRemoteHome</home> <remote>javaee.architect.SLSession.SLSessionRemote</remote> <ejb-class>javaee.architect.SLSession.SLSessionBean</ejb-class> <session-type>Stateless</session-type> <transaction-type>Container</transaction-type> </session>
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7: Enterprise JavaBeans and the EJB Container Model
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</enterprise-beans> <assembly-descriptor> <container-transaction> <method> <ejb-name>SLSession</ejb-name> <method-name>*</method-name> </method> <trans-attribute>Required</trans-attribute> </container-transaction> </assembly-descriptor> </ejb-jar>
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Some of the elements in the preceding deployment descriptor sample are described here:
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n ejb-jar
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The root element of the EJB deployment descriptor. These files are discussed later in the chapter, in the section The Life Cycle of an EJB. Declares the session, entity, and/or message-driven beans. Defines the enterprise bean to be a session bean as opposed to an entity or message-driven bean. A unique name of a session, entity, or message-driven bean in an ejb-jar file; this element is used to tie EJBs together and for constructing a URL (note that there is no relationship between the element ejb-name and the JNDI name that is assigned to an enterprise bean s home). The fully qualified name of an enterprise bean s home interface. The fully qualified name of enterprise bean s remote interface. The fully qualified name of the enterprise bean s class. The session-type element is either stateful or stateless.
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n ejb-name
n home n remote
n ejb-class
n session-type
n transaction-type
Declares whether transaction demarcation is performed by the enterprise bean or the EJB container.
5. Compile, Assemble, and Deploy Stateless Session Bean The next steps in the process are to compile, assemble, and then deploy the session bean. The following set of steps is used to complete this process. Although this book is designed for the architect and actual implementation steps are not required, we have added the details of these steps for completeness. As part of the deployment process, references in the deployment descriptor need to be resolved to actual resources in the container. How these resources are resolved is,
Distinguish Between Stateful and Stateless Session Beans
at the moment, container specific. In the WebLogic environment, the following file can be used for the stateless session bean example:
< xml version="1.0" > <!DOCTYPE weblogic-ejb-jar PUBLIC "-//BEA Systems, Inc.//DTD WebLogic 8.1.0 EJB//EN" "http://www.bea.com/servers/wls810/dtd/weblogic-ejb-jar.dtd" > <weblogic-ejb-jar> <weblogic-enterprise-bean> <ejb-name>SLSession</ejb-name> <jndi-name>SLSessionRemoteHome</jndi-name> </weblogic-enterprise-bean> </weblogic-ejb-jar>
Here are the remaining steps to complete the compile/package/deployment process: 1. Compile the Java classes. 2. Package the classes and deployment descriptors into a JAR file. 3. Generate stub and tie code for the container and add them to the JAR file. 4. Deploy the JAR file to the application server. 5. Package the required classes for a remote client of the bean. Here is an example client of the stateless session bean:
package javaee.architect.SLSession; import javax.naming.Context; import javax.naming.InitialContext; import java.util.Properties; // This client calls a method on a stateless session bean. public class SLSessionClient { public static void main(String[] args) throws Exception { // Get the JNDI initial context. Context ctx = getInitialContext(); // Get a reference to the home object Object obj = ctx.lookup("SLSessionRemoteHome"); // Narrow (cast) the returned RMI-IIOP object. SLSessionRemoteHome home = (SLSessionRemoteHome) javax.rmi.PortableRemoteObject.narrow(obj, SLSessionRemoteHome.class); // Use the home object (factory) to create the // SLSB EJB Object (the remote reference). SLSessionRemote mySLSessionRemote = home.create();
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