/* * Copyright 2004-2005 Sun Microsystems, Inc.  All rights reserved. * Use is subject to license terms. */package samples.ejb.stateful.simple.client;import java.util.*;import javax.naming.Context;import javax.naming.InitialContext;import javax.rmi.PortableRemoteObject;import samples.ejb.stateful.simple.tools.*;import samples.ejb.stateful.simple.ejb.*;/** * A simple java client. This demonstrates the use of stateful session bean. In this process * the client first creates a cart object, adds few books to that cart, lists the content of * the cart, removes few books from the cart. Overall, it demonstrates how the session bean * retains state information across method calls and within the same session. * <p>Client does the following, in order * <ul> * <li>Locates the home interface of the enterprise bean * <li>Gets a reference to the remote interface * <li>Invokes business methods * </ul> * <br> * <b>Locating the home interface:</b> * <blockquote><pre> *	Context initial = new InitialContext(); *	Object objref = initial.lookup("java:comp/env/ejb/SimpleCart"); *	CartHome home = (CartHome)PortableRemoteObject.narrow(objref, CartHome.class); * </pre></blockquote> * <br> * <b>Creating the remote interface:</b> * <blockquote><pre> *	Cart shoppingCart = home.create("Duke DeEarl","123"); * </pre></blockquote> * <br> * <b>Invoking business methods:</b> * <blockquote><pre> *	... *	shoppingCart.addBook("The Martian Chronicles"); *	... *	shoppingCart.removeBook("Alice in Wonderland"); *	... * </pre></blockquote> * <br> * * <b>Output:</b> * <pre> *	The Martian Chronicles *	2001 A Space Odyssey *	The Left Hand of Darkness *	Caught a BookException: Alice in Wonderland not in cart. * </pre> * * */public class CartClient {   /**    * The main method of the client. This invokes the <code>CartBean</code> to use    * its services. It then asks the stateful bean to add few books, list the contents    * of the cart and remove few books from the cart.    * See <code>appclient</code> documentation in Sun Java System Application Server to run the client.    *    */   public static void main(String[] args) {       try {           Context initial = new InitialContext();           Object objref = initial.lookup("java:comp/env/ejb/SimpleCart");           CartHome home =               (CartHome)PortableRemoteObject.narrow(objref,                                            CartHome.class);           Cart shoppingCart = home.create("Duke DeEarl","123");           shoppingCart.addBook("The Martian Chronicles");           shoppingCart.addBook("2001 A Space Odyssey");           shoppingCart.addBook("The Left Hand of Darkness");           Vector bookList = new Vector();           bookList = shoppingCart.getContents();           Enumeration enumer = bookList.elements();           while (enumer.hasMoreElements()) {              String title = (String) enumer.nextElement();              System.out.println(title);           }           shoppingCart.removeBook("Alice in Wonderland");           shoppingCart.remove();           System.exit(0);       } catch (BookException ex) {           System.err.println("Caught a BookException: " + ex.getMessage());           System.exit(0);       } catch (Exception ex) {           System.err.println("Caught an unexpected exception!");           ex.printStackTrace();           System.exit(1);       }   }}