listing 6.1 source code for helloworldsession.java
package usingj2ee.hello;

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

/** defines the methods you can call on a helloworldsession object */

public interface helloworldsession extends ejbobject
{

/** returns the session's greeting */
public string getgreeting() throws remoteexception;

/** changes the session's greeting */
public void setgreeting(string agreeting) throws remoteexception;

}

listing 6.2 source code for helloworldsessionhome.java
package usingj2ee.hello;

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

/** defines the methods for creating a helloworldsession */

public interface helloworldsessionhome extends ejbhome
{

/** creates a helloworldsession bean with default settings */
public helloworldsession create() throws remoteexception, createexception;

/** creates a helloworldsession bean with a specific initial greeting */
public helloworldsession create(string agreeting)
throws remoteexception, createexception;

}

listing 6.3 source code for helloworldsessionimpl.ava
package usingj2ee.hello;

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

/** the implementation class for the helloworldsession bean */

public class helloworldsessionimpl implements sessionbean
{
/** holds the session's greeting */
protected string greeting;

/** the session context provided by the ejb container. a session bean must
hold on to the context it is given. */

private sessioncontext context;

/** an ejb must have a public, parameterless constructor */

public helloworldsessionimpl()
{
}

/** called by the ejb container to set this session's context */

public void setsessioncontext(sessioncontext acontext)
{
context = acontext;
}

/** called by the ejb container when a client calls the create() method in
the home interface */

public void ejbcreate()
throws createexception
{
greeting = "hello world!";
}

/** called by the ejb container when a client calls the
create(string) method in the home interface */

public void ejbcreate(string agreeting)
throws createexception
{
greeting = agreeting;
}

/** called by the ejb container to wake this session bean up after it
has been put to sleep with the ejbpassivate method. */

public void ejbactivate()
{
}

/** called by the ejb container to tell this session bean that it is being
suspended from use (it's being put to sleep). */

public void ejbpassivate()
{
}

/** called by the ejb container to tell this session bean that it has been
removed, either because the client invoked the remove() method or the
container has timed the session out. */

public void ejbremove()
{
}

/** returns the session's greeting */

public string getgreeting()
{
return greeting;
}

/** changes the session's greeting */

public void setgreeting(string agreeting)
{
greeting = agreeting;
}
}