EJB3.0 一对一映射 报不能找到实体bean错误

[cmnong]

做了一个EJB，使用EJB3.0 + JPA
然后部署成ear文件。
单表的时候，可以persist()。
但是两个表，通过外键关联后，通过一对一映射，不管持久化那个实体bean，都不能找到JPA对应的实体bean。

使用 的数据库是MySQL

persistence.xml为

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
	<persistence-unit name="YingShe_PU">
	<jta-data-source>java:/yingshe_MySqlDS</jta-data-source>
	<class>huizhi.entity.Person</class>
	<class>huizhi.entity.Card</class>
	</persistence-unit>
</persistence>

实体bean代码

1、Person

package huizhi.entity;

import java.io.Serializable;
import javax.persistence.*;

@Entity
@Table(name="person")
public class Person implements Serializable {
	private static final long serialVersionUID = 1L;
	private int id;
	private String address;
	private int age;
	private String name;
	private String phone;
	private Card card;

    public Person() {
    }


	@Id
	@GeneratedValue(strategy=GenerationType.AUTO)
	@Column(unique=true, nullable=false)
	public int getId() {
		return this.id;
	}

	public void setId(int id) {
		this.id = id;
	}


	@Column(length=50)
	public String getAddress() {
		return this.address;
	}

	public void setAddress(String address) {
		this.address = address;
	}


	public int getAge() {
		return this.age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	@Column(nullable=false, length=20)
	public String getName() {
		return this.name;
	}

	public void setName(String name) {
		this.name = name;
	}


	@Column(length=15)
	public String getPhone() {
		return this.phone;
	}

	public void setPhone(String phone) {
		this.phone = phone;
	}

	//bi-directional one-to-one association to Card
	@OneToOne(cascade={CascadeType.REFRESH})
	@JoinColumn(name="cardid", referencedColumnName="cid")
	public Card getCard() {
		return this.card;
	}

	public void setCard(Card card) {
		this.card = card;
	}
	
}

2、card实体代码

package huizhi.entity;

import java.io.Serializable;
import javax.persistence.*;
import java.util.Date;

@Entity
@Table(name="card")
public class Card implements Serializable {
	private static final long serialVersionUID = 1L;
	private String cid;
	private Date valDate;
	private Person person;

    public Card() {
    }


	@Id
	@GeneratedValue(strategy=GenerationType.AUTO)
	@Column(name="Cid", unique=true, nullable=false, length=18)
	public String getCid() {
		return this.cid;
	}

	public void setCid(String cid) {
		this.cid = cid;
	}


    @Temporal( TemporalType.DATE)
	@Column(name="ValDate", nullable=false)
	public Date getValDate() {
		return this.valDate;
	}

	public void setValDate(Date valDate) {
		this.valDate = valDate;
	}

	//bi-directional one-to-one association to Person
	@OneToOne(mappedBy="card", cascade={CascadeType.MERGE, CascadeType.REMOVE}, optional=false)
	public Person getPerson() {
		return this.person;
	}

	public void setPerson(Person person) {
		this.person = person;
	}

}

3、会话bean调用部分

    @PersistenceContext(unitName="YingShe_PU")protected EntityManager em;
	public void addPerson(String name, int age, String phone, String address, String cid, Date valDate) {
		Person p = new Person();
		Card c = new Card();
		c.setCid(cid);
		c.setValDate(valDate);
		c.setPerson(p);
		p.setId(1);
		p.setName(name);
		p.setAddress(address);
		p.setAge(age);
		p.setPhone(phone);
		p.setCard(c);
		try{
			//em.persist(c);
			em.persist(p);
		}catch(Exception e){
			System.err.println(e.getMessage());
		}
	}

4、客户端

<%
		DateFormat format= new SimpleDateFormat("yyyy-MM-dd");            
		  
		InitialContext ctx = new InitialContext();		
		PersonbeanLocal pl = (PersonbeanLocal)ctx.lookup("Personbean");
		out.println("<br>---------------添加个人信息------------<br>");
		
		//添加一个个人信息
		pl.addPerson("李小婉",20,"13526606880","北京市朝阳区安定路","410182198807189875",format.parse("2020-12-12"));
		
%>

[cmnong]

咋这里，最怕的是什么，就是沉贴，千万别沉哦。

[cmnong]

[Quote=引用 3 楼 leejah163 的回复:]
不要用那些映射、外键之类的，就作为独立的表，查询自己写QL，外键维护起来麻烦容易出错~
[/Quote]


你是说用JDBC吗？

[cmnong]

可能是我吧两个不同工程打包到一个ear，而这两个不同的工程使用到的parsistecne 对应 persistence-unit 属性都是一样引起的，先调试一下吧！

[cmnong]

就是上面说的问题
把另一个工程移除后，就报下面的异常了：

16:52:54,765 ERROR [[jsp]] Servlet.service() for servlet jsp threw exception
org.hibernate.PersistentObjectException: detached entity passed to persist: huizhi.entity.Person
	at org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:102)
	at org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:61)
	at org.hibernate.impl.SessionImpl.firePersist(SessionImpl.java:645)
	at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:619)
	at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:623)
	at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:220)
	at org.jboss.jpa.tx.TransactionScopedEntityManager.persist(TransactionScopedEntityManager.java:187)
	at huizhi.sessionbean.Personbean.addPerson(Personbean.java:37)

[cmnong]

别让沉贴呀，高手快帮忙，分析一下
谢谢

[LeeJah163]

不要用那些映射、外键之类的，就作为独立的表，查询自己写QL，外键维护起来麻烦容易出错~