……

import javax.ejb.Stateful;

……

@Stateful

public class CounterBean implements Counter

{

    //增加事务支持   

    @Tx(TxType.REQUIRESNEW)

    public int getNumber()

    {

        return number;

    }

    @Remove

    public void clean()

    {

        System.out.println("我，被删除了!");

    }

}

package com.kuaff.ejb3.stateful;

import javax.ejb.EJBException;

import java.rmi.NoSuchObjectException;

import javax.naming.InitialContext;

import javax.naming.NamingException;

public class Client

{

    public static void main(String[] args)

    {

        InitialContext ctx;

        try

        {

            ctx = new InitialContext();

            Counter counter = (Counter) ctx.lookup(Counter.class.getName());

            counter.add(10);

            System.out.println("当前的number:" + counter.getNumber());

            counter.add(10);

            System.out.println("当前的number:" + counter.getNumber());

            Counter counter2 = (Counter) ctx.lookup(Counter.class.getName());

            counter2.add(10);

            System.out.println("当前的number:" + counter2.getNumber());

            //删除

            counter2.clean();

            //下面如果再使用counter2,将出错

            try

            {

                System.out.println("当前的number:" + counter2.getNumber());

            }

            catch(EJBException ex)

            {

                if (ex.getCausedByException() instanceof NoSuchObjectException)

                {

                    System.out.println("我都被删除啦，还找我！");

                }

                else

                {

                    throw ex;

                }

            }

        }

        catch (NamingException e)

        {

            e.printStackTrace();

        }

    }

}