Jpa 该字段存在多个可写映射_Jpa

Jpa 该字段存在多个可写映射

jpa

Jpa 该字段存在多个可写映射,jpa,Jpa,我正在尝试应用订单和发票表之间的一对一关系。但我得到以下错误 run: [EL Info]: 2014-04-19 01:52:07.791--ServerSession(287170778)--EclipseLink, version: Eclipse Persistence Services - 2.2.0.v20110202-r8913 [EL Severe]: 2014-04-19 01:52:08.256--ServerSession(287170778)--Local Exc

我正在尝试应用订单和发票表之间的一对一关系。但我得到以下错误

    run:
[EL Info]: 2014-04-19 01:52:07.791--ServerSession(287170778)--EclipseLink, version: Eclipse Persistence Services - 2.2.0.v20110202-r8913
[EL Severe]: 2014-04-19 01:52:08.256--ServerSession(287170778)--Local Exception Stack: 
Exception [EclipseLink-0] (Eclipse Persistence Services - 2.2.0.v20110202-r8913): org.eclipse.persistence.exceptions.IntegrityException
Descriptor Exceptions: 
---------------------------------------------------------

Exception [EclipseLink-48] (Eclipse Persistence Services - 2.2.0.v20110202-r8913): org.eclipse.persistence.exceptions.DescriptorException
Exception Description: Multiple writable mappings exist for the field [ORDER_INVOICE.ORDER_ID].  Only one may be defined as writable, all others must be specified read-only.
Mapping: org.eclipse.persistence.mappings.OneToOneMapping[order]
Descriptor: RelationalDescriptor(entity.Invoice --> [DatabaseTable(ORDER_INVOICE)])

Runtime Exceptions: 
---------------------------------------------------------

    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.initializeDescriptors(DatabaseSessionImpl.java:476)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.initializeDescriptors(DatabaseSessionImpl.java:407)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.postConnectDatasource(DatabaseSessionImpl.java:680)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:628)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:233)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:394)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.getServerSession(EntityManagerFactoryImpl.java:185)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:242)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:230)
    at test.OneToOneTest.main(OneToOneTest.java:14)

Descriptor Exceptions: 
---------------------------------------------------------


Local Exception Stack: 
Exception [EclipseLink-48] (Eclipse Persistence Services - 2.2.0.v20110202-r8913): org.eclipse.persistence.exceptions.DescriptorException
Exception Description: Multiple writable mappings exist for the field [ORDER_INVOICE.ORDER_ID].  Only one may be defined as writable, all others must be specified read-only.
Mapping: org.eclipse.persistence.mappings.OneToOneMapping[order]
Descriptor: RelationalDescriptor(entity.Invoice --> [DatabaseTable(ORDER_INVOICE)])
    at org.eclipse.persistence.exceptions.DescriptorException.multipleWriteMappingsForField(DescriptorException.java:1003)
    at org.eclipse.persistence.internal.descriptors.ObjectBuilder.initialize(ObjectBuilder.java:2839)
    at org.eclipse.persistence.descriptors.ClassDescriptor.initialize(ClassDescriptor.java:2857)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.initializeDescriptors(DatabaseSessionImpl.java:453)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.initializeDescriptors(DatabaseSessionImpl.java:407)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.postConnectDatasource(DatabaseSessionImpl.java:680)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:628)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:233)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:394)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.getServerSession(EntityManagerFactoryImpl.java:185)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:242)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:230)
    at test.OneToOneTest.main(OneToOneTest.java:14)

Runtime Exceptions: 
---------------------------------------------------------

[EL Severe]: 2014-04-19 01:52:08.26--ServerSession(287170778)--Local Exception Stack: 
Exception [EclipseLink-0] (Eclipse Persistence Services - 2.2.0.v20110202-r8913): org.eclipse.persistence.exceptions.IntegrityException
Descriptor Exceptions: 
---------------------------------------------------------

Exception [EclipseLink-48] (Eclipse Persistence Services - 2.2.0.v20110202-r8913): org.eclipse.persistence.exceptions.DescriptorException
Exception Description: Multiple writable mappings exist for the field [ORDER_INVOICE.ORDER_ID].  Only one may be defined as writable, all others must be specified read-only.
Mapping: org.eclipse.persistence.mappings.OneToOneMapping[order]
Descriptor: RelationalDescriptor(entity.Invoice --> [DatabaseTable(ORDER_INVOICE)])

Runtime Exceptions: 
---------------------------------------------------------

    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.initializeDescriptors(DatabaseSessionImpl.java:476)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.initializeDescriptors(DatabaseSessionImpl.java:407)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.postConnectDatasource(DatabaseSessionImpl.java:680)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:628)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:233)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:394)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.getServerSession(EntityManagerFactoryImpl.java:185)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:242)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:230)
    at test.OneToOneTest.main(OneToOneTest.java:14)

Descriptor Exceptions: 
---------------------------------------------------------


Local Exception Stack: 
Exception [EclipseLink-48] (Eclipse Persistence Services - 2.2.0.v20110202-r8913): org.eclipse.persistence.exceptions.DescriptorException
Exception Description: Multiple writable mappings exist for the field [ORDER_INVOICE.ORDER_ID].  Only one may be defined as writable, all others must be specified read-only.
Mapping: org.eclipse.persistence.mappings.OneToOneMapping[order]
Descriptor: RelationalDescriptor(entity.Invoice --> [DatabaseTable(ORDER_INVOICE)])
    at org.eclipse.persistence.exceptions.DescriptorException.multipleWriteMappingsForField(DescriptorException.java:1003)
    at org.eclipse.persistence.internal.descriptors.ObjectBuilder.initialize(ObjectBuilder.java:2839)
    at org.eclipse.persistence.descriptors.ClassDescriptor.initialize(ClassDescriptor.java:2857)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.initializeDescriptors(DatabaseSessionImpl.java:453)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.initializeDescriptors(DatabaseSessionImpl.java:407)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.postConnectDatasource(DatabaseSessionImpl.java:680)
Exception in thread "main" javax.persistence.PersistenceException: Exception [EclipseLink-0] (Eclipse Persistence Services - 2.2.0.v20110202-r8913): org.eclipse.persistence.exceptions.IntegrityException
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:628)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:233)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:394)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.getServerSession(EntityManagerFactoryImpl.java:185)
Descriptor Exceptions: 
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:242)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:230)
    at test.OneToOneTest.main(OneToOneTest.java:14)

Runtime Exceptions: 
---------------------------------------------------------

---------------------------------------------------------

Exception [EclipseLink-48] (Eclipse Persistence Services - 2.2.0.v20110202-r8913): org.eclipse.persistence.exceptions.DescriptorException
Exception Description: Multiple writable mappings exist for the field [ORDER_INVOICE.ORDER_ID].  Only one may be defined as writable, all others must be specified read-only.
Mapping: org.eclipse.persistence.mappings.OneToOneMapping[order]
Descriptor: RelationalDescriptor(entity.Invoice --> [DatabaseTable(ORDER_INVOICE)])

Runtime Exceptions: 
---------------------------------------------------------

    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:422)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.getServerSession(EntityManagerFactoryImpl.java:185)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:242)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:230)
    at test.OneToOneTest.main(OneToOneTest.java:14)
Caused by: Exception [EclipseLink-0] (Eclipse Persistence Services - 2.2.0.v20110202-r8913): org.eclipse.persistence.exceptions.IntegrityException
Descriptor Exceptions: 
---------------------------------------------------------

Exception [EclipseLink-48] (Eclipse Persistence Services - 2.2.0.v20110202-r8913): org.eclipse.persistence.exceptions.DescriptorException
Exception Description: Multiple writable mappings exist for the field [ORDER_INVOICE.ORDER_ID].  Only one may be defined as writable, all others must be specified read-only.
Mapping: org.eclipse.persistence.mappings.OneToOneMapping[order]
Descriptor: RelationalDescriptor(entity.Invoice --> [DatabaseTable(ORDER_INVOICE)])

Runtime Exceptions: 
---------------------------------------------------------

    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.initializeDescriptors(DatabaseSessionImpl.java:476)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.initializeDescriptors(DatabaseSessionImpl.java:407)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.postConnectDatasource(DatabaseSessionImpl.java:680)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:628)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:233)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:394)
    ... 4 more
Java Result: 1
BUILD SUCCESSFUL (total time: 2 seconds)

实体类：订单（订单必须有发票）

主要类别：

 package test;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;

import entity.Order;

public class OneToOneTest {

    public static void main(String[] args) {
        EntityManagerFactory entityManagerFactory =  Persistence.createEntityManagerFactory("TESTJPAPU");

        EntityManager em = entityManagerFactory.createEntityManager();

        Order order = em.find(Order.class, 111);
        em.close();
        entityManagerFactory.close();
        System.out.println("order : " + order);

    }
}

Persistence.xml：

    <?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="TESTJPAPU" transaction-type="RESOURCE_LOCAL">
    <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
        <class>entity.Customer</class>
        <class>entity.Address</class>    
        <class>entity.OnlineCustomer</class>
        <class>entity.CustomerSingle</class>  
        <class>entity.OnlineCustomerJoined</class>
        <class>entity.CustomerJoined</class>
        <class>entity.OnlineCustomerTable</class>
        <class>entity.CustomerTable</class>
        <class>entity.Order</class>
        <class>entity.Invoice</class>

    <properties>
      <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/CUSTOMERJPA?zeroDateTimeBehavior=convertToNull"/>
      <property name="javax.persistence.jdbc.password" value=""/>
      <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
      <property name="javax.persistence.jdbc.user" value="root"/>

      <property name="eclipselink.create-ddl-jdbc-file-name" value="createDDL_ddlGeneration.jdbc"/> 
      <property name="eclipselink.drop-ddl-jdbc-file-name" value="dropDDL_ddlGeneration.jdbc"/> 
      <property name="eclipselink.ddl-generation.output-mode" value="both"/>
    </properties>
  </persistence-unit>
</persistence>


org.eclipse.persistence.jpa.PersistenceProvider
实体.客户
实体.地址
entity.OnlineCustomer
entity.CustomerSingle
entity.OnlineCustomerJoined
entity.CustomerJoined
entity.OnlineCustomerTable
entity.CustomerTable
实体.秩序
实体发票

从上面的代码中，我可以看到，

发票

和

订单

实体之间的一对一映射已正确定义。异常的根本原因可能与使用旧实体模型创建的过时数据库模式有关，并且应用程序仍在使用该模式

尝试将以下属性添加到persistence.xml：

    <?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="TESTJPAPU" transaction-type="RESOURCE_LOCAL">
    <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
        <class>entity.Customer</class>
        <class>entity.Address</class>    
        <class>entity.OnlineCustomer</class>
        <class>entity.CustomerSingle</class>  
        <class>entity.OnlineCustomerJoined</class>
        <class>entity.CustomerJoined</class>
        <class>entity.OnlineCustomerTable</class>
        <class>entity.CustomerTable</class>
        <class>entity.Order</class>
        <class>entity.Invoice</class>

    <properties>
      <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/CUSTOMERJPA?zeroDateTimeBehavior=convertToNull"/>
      <property name="javax.persistence.jdbc.password" value=""/>
      <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
      <property name="javax.persistence.jdbc.user" value="root"/>

      <property name="eclipselink.create-ddl-jdbc-file-name" value="createDDL_ddlGeneration.jdbc"/> 
      <property name="eclipselink.drop-ddl-jdbc-file-name" value="dropDDL_ddlGeneration.jdbc"/> 
      <property name="eclipselink.ddl-generation.output-mode" value="both"/>
    </properties>
  </persistence-unit>
</persistence>

它将强制从当前实体模型重新创建数据库架构。

请访问并查看klonq的答案

    <?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="TESTJPAPU" transaction-type="RESOURCE_LOCAL">
    <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
        <class>entity.Customer</class>
        <class>entity.Address</class>    
        <class>entity.OnlineCustomer</class>
        <class>entity.CustomerSingle</class>  
        <class>entity.OnlineCustomerJoined</class>
        <class>entity.CustomerJoined</class>
        <class>entity.OnlineCustomerTable</class>
        <class>entity.CustomerTable</class>
        <class>entity.Order</class>
        <class>entity.Invoice</class>

    <properties>
      <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/CUSTOMERJPA?zeroDateTimeBehavior=convertToNull"/>
      <property name="javax.persistence.jdbc.password" value=""/>
      <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
      <property name="javax.persistence.jdbc.user" value="root"/>

      <property name="eclipselink.create-ddl-jdbc-file-name" value="createDDL_ddlGeneration.jdbc"/> 
      <property name="eclipselink.drop-ddl-jdbc-file-name" value="dropDDL_ddlGeneration.jdbc"/> 
      <property name="eclipselink.ddl-generation.output-mode" value="both"/>
    </properties>
  </persistence-unit>
</persistence>