Eclipselink 和 Spring 3.1答案

【问题标题】：Eclipselink and Spring 3.1Eclipselink 和 Spring 3.1
【发布时间】：2012-05-10 11:41:53
【问题描述】：

我已经让 Hibernate 正常工作，但我正在尝试更改为 Eclipselink。我一直在为此寻找解决方案，但没有结果。人们建议将这两个（不要放在一起）

<class>no.mesta.driftslogg.model.Person</class>  
<exclude-unlisted-classes>false</exclude-unlisted-classes>

在persistence.xml中

persitence.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0" 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_1_0.xsd">

<persistence-unit name="cccPersistenceUnit">
    <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
    <exclude-unlisted-classes>false</exclude-unlisted-classes>
    <properties>
        <property name="eclipselink.ddl-generation" value="create-tables" />
        <property name="eclipselink.ddl-generation.output-mode" value="database" />
    </properties>
</persistence-unit>

应用程序上下文.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"  xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="
    http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.0.xsd">



<!-- Spring transaction manager -->
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager" p:entityManagerFactory-ref="entityManagerFactory" />

<!-- JPA Hibernate shared entity manager -->
<bean id="entityManager" class="org.springframework.orm.jpa.support.SharedEntityManagerBean" p:entityManagerFactory-ref="entityManagerFactory" /


<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">

    <property name="dataSource" ref="dataSource" />
    <property name="persistenceUnitName" value="cccPersistenceUnit" />
    <property name="jpaDialect" ref="jpaDialect" />
    <property name="jpaVendorAdapter">
        <bean class="org.springframework.orm.jpa.vendor.EclipseLinkJpaVendorAdapter">
        </bean>
    </property>
    <property name="loadTimeWeaver">
        <bean class="org.springframework.instrument.classloading.SimpleLoadTimeWeaver" />
    </property>
</bean>

<bean id="jpaDialect" class="org.springframework.orm.jpa.vendor.EclipseLinkJpaDialect" />

<bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />

<bean id="jpaVendorAdapter" class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
    <property name="generateDdl" value="true" />
    <property name="databasePlatform" value="org.hibernate.dialect.MySQLDialect" />
    <!-- <property name="showSql" value="true" /> -->
</bean>



<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
    <property name="driverClass" value="com.mysql.jdbc.Driver" />
    <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/driftslogg" />
    <property name="user" value="root" />
    <property name="password" value="root" />
    <property name="acquireIncrement" value="5" />
    <property name="idleConnectionTestPeriod" value="60" />
    <property name="maxPoolSize" value="100" />
    <property name="maxStatements" value="50" />
    <property name="minPoolSize" value="10" />
</bean>

道类

package no.mesta.driftslogg.dao.jpa;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

import no.mesta.driftslogg.dao.PersonDao;
import no.mesta.driftslogg.model.Person;

import org.springframework.stereotype.Repository;

@Repository
public class PersonDaoJpa implements PersonDao {

protected EntityManager entityManager;

@PersistenceContext
public void setEntityManager(EntityManager entityManager) {
    this.entityManager = entityManager;
}

@Override
public Person save(Person person) {
    if (person.getId() != null) {
        return entityManager.merge(person);
    } else {
        entityManager.persist(person);
    }
    return person;
}

}

实体类

package no.mesta.driftslogg.model;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
public class Person {

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;

private String name;

public Long getId() {
    return id;
}

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

public String getName() {
    return name;
}

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

}

错误

org.springframework.web.util.NestedServletException：请求处理失败；嵌套异常是 java.lang.IllegalArgumentException: Object: Todo [summary=This is a test, description=This is a test] 不是已知的实体类型。 org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:894) org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778) javax.servlet.http.HttpServlet.service(HttpServlet.java:621) javax.servlet.http.HttpServlet.service(HttpServlet.java:722) org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) com.opensymphony.sitemesh.webapp.SiteMeshFilter.obtainContent(SiteMeshFilter.java:129) com.opensymphony.sitemesh.webapp.SiteMeshFilter.doFilter(SiteMeshFilter.java:77) 根本原因 java.lang.IllegalArgumentException: Object: Todo [summary=This is a test, description=This is a test] 不是已知的实体类型。 org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.registerNewObjectForPersist(UnitOfWorkImpl.java:4169) org.eclipse.persistence.internal.jpa.EntityManagerImpl.persist(EntityManagerImpl.java:440) no.mesta.driftslogg.dao.jpa.PersonDaoJpa.save(PersonDaoJpa.java:45) no.mesta.driftslogg.service.impl.PersonServiceImpl.savePerson(PersonServiceImpl.java:20) sun.reflect.NativeMethodAccessorImpl.invoke0（本机方法） sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) java.lang.reflect.Method.invoke(Method.java:597) org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:318) org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183) org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150) org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110) org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202) $Proxy15.savePerson（未知来源） no.mesta.driftslogg.controller.HomeController.home(HomeController.java:31) sun.reflect.NativeMethodAccessorImpl.invoke0（本机方法） sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) java.lang.reflect.Method.invoke(Method.java:597) org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:212) org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:126) org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:96) org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617) org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578) org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80) org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:900) org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:827) org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882) org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778) javax.servlet.http.HttpServlet.service(HttpServlet.java:621) javax.servlet.http.HttpServlet.service(HttpServlet.java:722) org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) com.opensymphony.sitemesh.webapp.SiteMeshFilter.obtainContent(SiteMeshFilter.java:129) com.opensymphony.sitemesh.webapp.SiteMeshFilter.doFilter(SiteMeshFilter.java:77)

【问题讨论】：

标签： spring jpa eclipselink

【解决方案1】：

您的错误在于“Todo”对象，而不是人。确保您已映射所有相关对象。

你需要把 no.mesta.driftslogg.model.Person 放在你的 persistence.xml 中，你没有这个。

【讨论】：

对 Todo 感到抱歉。人给出了相同的结果。我正在尝试不同的实体。很抱歉造成混乱。

【解决方案2】：

我没有使用 SimpleLoadTimeWeaver（我也无法使用它），而是使用

<context:load-time-weaver/>

这需要使用 spring-instrument 中的 java 代理，因此您必须使用 agument 启动 JVM，告诉它在哪里可以找到它。类似的东西

-javaagent:spring-instrument-3.1.1.RELEASE.jar

【讨论】：