5497l1.txt 0100664 0002046 0000330 00000013054 07361063564 011463 0 ustar jill ljedit 5497l1
Listing 1. build.xml, the Ant File that Turns Our .java Files and
Deployment Descriptor into a Full-Fledged EJB
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Listing 2. CalculatorBean.java, the Bean Class for Our EJB Calculator
package il.co.lerner.calculator;
import java.rmi.RemoteException;
import javax.ejb.SessionBean;
import javax.ejb.SessionContext;
public class CalculatorBean implements SessionBean
{
// This version of multiply() handles integers
public int multiply(int num1, int num2)
{
System.out.println("Multiply invoked with ints '", +
num1 + "' and '" + num2 + "'.");
return num1 * num2;
}
// ejbCreate -- we don't need this for our session bean
public void ejbCreate() {}
// ejbRemote -- we don't need this for our session bean
public void ejbRemove() {}
// ejbActivate -- we don't need this for our session bean
public void ejbActivate() {}
// ejbActivate -- we don't need this for our session bean
public void ejbPassivate() {}
// setSessionContext -- we don't need this for our session bean
public void setSessionContext(SessionContext sc) {}
}
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Listing 3. ejb-jar.xml, the Deployment Descriptor for Our calculator
Bean
ATF Calculator Session Bean
Calculator Session Bean
Calculator
il.co.lerner.calculator.CalculatorHome
il.co.lerner.calculator.Calculator
il.co.lerner.calculator.CalculatorBean
Stateless
Bean
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Listing 4. UseCalculator.java, Which Connects To and Uses Our
Calculator EJB
package il.co.lerner.calculator;
import javax.naming.InitialContext;
import javax.rmi.PortableRemoteObject;
import il.co.lerner.calculator.Calculator;
import il.co.lerner.calculator.CalculatorHome;
class UseCalculator
{
public static void main(String[] args)
{
try
{
// Get a naming context
InitialContext jndiContext = new InitialContext();
System.out.println("Got context");
// Get a reference to the Calculator Bean
Object ref = jndiContext.lookup("calculator/Calculator");
System.out.println("Got reference");
// Get a reference from this to the Bean's Home interface
CalculatorHome home = (CalculatorHome)
PortableRemoteObject.narrow(ref, CalculatorHome.class);
// Create a Calculator object from the Home interface
Calculator calculator = home.create();
// call multiply()
System.out.println("Multiplying 2 x 3:");
System.out.println(calculator.multiply(2, 3));
}
catch(Exception e)
{
System.out.println(e.toString());
}
}
}