AccountClient.java

package examples;

import javax.ejb.*;
import javax.naming.*;
import java.rmi.*;
import javax.rmi.*;
import java.util.*;

/**
 * Sample client code which manipulates a Bank Account Entity Bean.
 */
public class AccountClient {

 public static void main(String[] args) throws Exception {

  Account account = null;

  try {
   /*
    * Get a reference to the Account Home Object - the
    * factory for Account EJB Objects
                         */
   Context ctx = new InitialContext(System.getProperties());
   
   Object obj = ctx.lookup("AccountHome");
   AccountHome home = (AccountHome) javax.rmi.PortableRemoteObject.narrow(obj, AccountHome.class);

   System.err.println("Total of all accounts in bank initially = " + home.getTotalBankValue());

   /*
    * Use the factory to create the Account EJB Object
    */
   home.create("123-456-7890", "John Smith");

   /*
    * Find an account
    */
   Iterator i = home.findByOwnerName("John Smith").iterator();
   if (i.hasNext()) {
     account = (Account)
       javax.rmi.PortableRemoteObject.narrow(
         i.next(), Account.class);

   }
   else {
    throw new Exception("Could not find account");
   }

   /*
    * Call the balance() method, and print it
    */
   System.out.println("Initial Balance = " + account.getBalance());

   /*
    * Deposit $100 into the account
    */
   account.deposit(100);

   /*
    * Retrieve the resulting balance.
    */
   System.out.println("After depositing 100, account balance = " + account.getBalance());

   System.out.println("Total of all accounts in bank now = " + home.getTotalBankValue());

   /*
    * Retrieve the Primary Key from the EJB Object
    */
   AccountPK pk = (AccountPK) account.getPrimaryKey();

   /*
    * Release our old EJB Object reference.  Now call
    * find() again, this time querying on Account ID
    * (i.e. the Primary Key).
    */
   account = null;
   account = home.findByPrimaryKey(pk);

   /*
    * Print out current balance
    */
   System.out.println("Found account with ID " + pk + ".  Balance = " + account.getBalance());

   /*
    * Try to withdraw $150
    */
   System.out.println("Now trying to withdraw $150, which is more than is currently available.  This should generate an exception..");
   account.withdraw(150);

  }
  catch (Exception e) {
   System.out.println("Caught exception!");
   e.printStackTrace();
  }
  finally {
   /*
    * Destroy the Entity permanently
    */
   try {
    System.out.println("Destroying account..");
    if (account != null) {
     account.remove();
    }
   }
   catch (Exception e) {
    e.printStackTrace();
   }
  }
 }
}