Lucas Jellema 最近写了篇文章，名字叫：Getting Started with EJB 3.0 Persistence out-of-container using the Reference Implementation （GlassFish）。

　　该文介绍了如何在J2EE Container之外使用EJB 3.0 Persistence，实现了service类和data model.

　　Lucas Jellema提到的步骤如下：

　　1.下载和安装 Java 5 （JDK 5.0/JRE 5.0）

　　2.下载和配置 GlassFish

　　GlassFish：https://glassfish.dev.java.net/

　　3.创建Entities - POJOs with annotations that link them to database objects

　　比如其中的员工类：

package nl.amis.ejb30.hrm;

import java.io.Serializable;

import java.sql.Timestamp;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name="EMP")
public class Employee implements Serializable {
    private Double comm;

    private Long deptno;

    private Long empno;

    private String ename;

    private Timestamp hiredate;

    private String job;

    private Long mgr;

    private Double sal;

    public Employee() {
    }

    public Employee(Long empno) {
        this.empno = empno;
    }

    @Column(name="COMM")
    public Double getComm() {
        return comm;
    }

    public void setComm(Double comm) {
        this.comm = comm;
    }

    @Column(name="DEPTNO")
    public Long getDeptno() {
        return deptno;
    }

    public void setDeptno(Long deptno) {
        this.deptno = deptno;
    }

    @Id
    @Column(name="EMPNO", nullable=false)
    public Long getEmpno() {
        return empno;
    }

    public void setEmpno(Long empno) {
        this.empno = empno;
    }

    @Column(name="ENAME")
    public String getEname() {
        return ename;
    }

    public void setEname(String ename) {
        this.ename = ename;
    }

    @Column(name="HIREDATE")
    public Timestamp getHiredate() {
        return hiredate;
    }

    public void setHiredate(Timestamp hiredate) {
        this.hiredate = hiredate;
    }

    @Column(name="JOB")
    public String getJob() {
        return job;
    }

    public void setJob(String job) {
        this.job = job;
    }

    @Column(name="MGR")
    public Long getMgr() {
        return mgr;
    }

    public void setMgr(Long mgr) {
        this.mgr = mgr;
    }

    @Column(name="SAL")
    public Double getSal() {
        return sal;
    }

    public void setSal(Double sal) {
        this.sal = sal;
    }
}

<persistence xmlns="http://java.sun.com/xml/ns/persistence">
    <persistence-unit name="pu1">
        <!?C Provider class name is required in Java SE ?C>
        <provider>oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider</provider>
        <!?C All persistence classes must be listed ?C>
        <class>nl.amis.ejb30.hrm.Department</class>
        <class>nl.amis.ejb30.hrm.Employee</class>
        <properties>
            <!?C Provider-specific connection properties ?C>
            <property name="jdbc.driver" value="oracle.jdbc.driver.OracleDriver"/>
            <property name="jdbc.connection.string" value="jdbc:oracle:thin:@localhost:1521:ORCL"/>
            <property name="jdbc.user" value="scott"/>
            <property name="jdbc.password" value="tiger"/>
            <!?C Provider-specific settings ?C>
            <property name="toplink.logging.level" value="INFO"/>
        </properties>
    </persistence-unit>
</persistence>

　　5.创建一个 Business Service class ，提供 Entitiy Services （好像一个out-of-container的Session Bean）

　　6.创建一个客户端

　　7.可以运行程序了

　　最后的包结构如下：

　　你体验过EJB3吗？发表下感想吧。