不允许在共享EntityManager上创建事务 - 使用Spring事务或EJB CMT [英] Not allowed to create transaction on shared EntityManager - use Spring transactions or EJB CMT

问题描述

这篇文章是继续 JPA如何获得数据库中的值后继续

当我执行以下我遇到以下异常，我该如何解决这个问题？

 不允许在共享EntityManager上创建事务 - 使用Spring 
事务或EJB CMT 
  

$ b

DAOImpl 代码

  public void创建（项目项目）{
 entityManager.persist（project）; 
 entityManager.getTransaction（）。commit（）; 
 project = entityManager.find（Project.class，project.getProjectId（））; 
 entityManager.refresh（project）; 
 System.out.println（Id  - + project.getProjectId（））; 
 System.out.println（no  - + project.getProjectNo（））; 
} 
  

applicationContext.xml

 < beans xmlns =http://www.springframework.org/schema/beans
 xmlns：xsi =http：/ /www.w3.org/2001/XMLSchema-instancexmlns：tx =http://www.springframework.org/schema/tx
 xmlns：context =http://www.springframework.org / schema / context
 xsi：schemaLocation =http://www.springframework.org/schema/beans 
 http://www.springframework.org/schema/beans/spring-beans-3.0 .xsd 
 http://www.springframework.org/schema/tx 
 http://www.springframework.org/schema/tx/spring-tx-3.0.xsd 
 http： //www.springframework.org/schema/context 
 http://www.springframework.org/schema/context/spring-context-3.0.xsd\"> 
 
< bean id =DataSource
 class =org.springframework.jdbc.datasource.DriverManagerDataSource> 
< property name =usernamevalue =scott/> 
< property name =passwordvalue =tiger/> 
< property name =driverClassNamevalue =oracle.jdbc.driver.OracleDriver/> 
 < / bean> 
 
< bean id =entityManagerFactory
 class =org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean> 
< property name =dataSourceref =DataSource/> 
< property name =packagesToScanvalue =test.entity/> 
< property name =jpaVendorAdapter> 
< bean class =org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter> 
< property name =showSqlvalue =true/> 
< property name =generateDdlvalue =false/> 
< property name =databasePlatformvalue =org.hibernate.dialect.Oracle10gDialect/> 
< / bean> 
< / property> 
< / bean> 
 
< context：component-scan base-package =test.net/> 
 
< tx：注解驱动的事务管理器=transactionManager/> 
 
< bean id =transactionManagerclass =org.springframework.orm.jpa.JpaTransactionManager> 
< property name =entityManagerFactoryref =entityManagerFactory/> 
< / bean> 
 
< context：annotation-config /> 
 
< / beans> 
  

解决方案

我猜这里的问题在于，事务管理器的bean，你没有使用 @Transactional 来注释create（）方法，它可以实现spring事务。

同时删除 entityManager.getTransaction（）。commit（）; 语句，因为所有事务管理都将在春季处理，如果您保留原样那么你将再次得到同样的错误。

This post is in continuation of JPA How to get the value from database after persist

When I execute the following I am getting following exception, how can I resolve this?

Not allowed to create transaction on shared EntityManager - use Spring 
transactions or EJB CMT

DAOImpl code

public void create(Project project) {
        entityManager.persist(project);
        entityManager.getTransaction().commit();
        project = entityManager.find(Project.class, project.getProjectId());
        entityManager.refresh(project);
        System.out.println("Id    -- " + project.getProjectId());
            System.out.println("no -- " + project.getProjectNo());
    }

applicationContext.xml

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">

    <bean id="DataSource"
        class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="username" value="scott" />
        <property name="password" value="tiger" />
        <property name="driverClassName" value="oracle.jdbc.driver.OracleDriver" />
        <property name="url" value="jdbc:oracle:thin:@myserver:1521:ORCL" />
    </bean>

    <bean id="entityManagerFactory"
        class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="dataSource" ref="DataSource" />
        <property name="packagesToScan" value="test.entity" />
        <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
                <property name="showSql" value="true" />
                <property name="generateDdl" value="false" />
                <property name="databasePlatform" value="org.hibernate.dialect.Oracle10gDialect" />
            </bean>
        </property>
    </bean>

    <context:component-scan base-package="test.net" />

    <tx:annotation-driven transaction-manager="transactionManager"/> 

     <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactory" />
    </bean>         

     <context:annotation-config/>

</beans>

解决方案

I guess the problem here is that although you have defined the bean for the transaction manager, you haven't annotated the create() method with @Transactional which enables spring transactions.

Also remove the entityManager.getTransaction().commit(); statement as now all the transaction management will be handled by spring, if you leave the statement as it is then you will get the same error again.

这篇关于不允许在共享EntityManager上创建事务 - 使用Spring事务或EJB CMT的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！