Spring - PersistenceContext - 沒有事務性的EntityManager可用

我使用Spring和JPA，並且所有的getter都在工作。我可以從數據庫獲取對象，但是當我嘗試保存某些內容時，出現「沒有事務性EntityManager可用」的錯誤，並且我有交易的註釋。Spring - PersistenceContext - 沒有事務性的EntityManager可用

這裏是我的DAO：

@Repository("userDao") 
    @Transactional 
    //public class UserDaoImpl extends GenericDaoImpl<User, Long> implements IUserDao { 
    public class UserDaoImpl implements IUserDao { 

     final protected Logger logger = LoggerFactory.getLogger(this.getClass()); 

     public UserDaoImpl() { 
     } 

     @PersistenceContext(unitName = "ovdigitalPU") 
     protected EntityManager entityManager; 

    @Override 
     @Transactional(readOnly = false, propagation = Propagation.REQUIRED) 
     public void save(User user) throws DuplicatedUserException { 
      logger.info("Creating User with username: " + user.getUsername()); 
      User foundUser = null; 
      logger.info("Checking if user already existis..."); 
      /*foundUser = this.findByUsername(user.getUsername()); 

      if(foundUser != null) { 
       throw new DuplicatedUserException(); 
      }*/ 

      entityManager.persist(user); 
      logger.info("User " + user.getUsername() + " was been saved with success!"); 

     }

這裏是我的根的context.xml

<?xml version="1.0" encoding="UTF-8" standalone="no"?> 
<beans xmlns="http://www.springframework.org/schema/beans" 
    xmlns:mvc="http://www.springframework.org/schema/mvc" 
    xmlns:p="http://www.springframework.org/schema/p" xmlns:tx="http://www.springframework.org/schema/tx" 
    xmlns:context="http://www.springframework.org/schema/context" 
     xmlns:aop="http://www.springframework.org/schema/aop" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    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/aop 
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd 
http://www.springframework.org/schema/mvc 
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd 
http://www.springframework.org/schema/context 
http://www.springframework.org/schema/context/spring-context-3.0.xsd"> 

    <!-- Root Context: defines shared resources visible to all other web components --> 
    <context:annotation-config /> 

    <bean id="viewResolver" 
     class="org.springframework.web.servlet.view.InternalResourceViewResolver"> 
     <property name="prefix" value="/WEB-INF/views/" /> 
     <property name="suffix" value=".jsp" /> 
    </bean> 

    <bean id="ovdigitalDS" 
     class="org.apache.commons.dbcp.BasicDataSource" 
     p:driverClassName="com.mysql.jdbc.Driver" p:url="jdbc:mysql://localhost/ovdigital" 
     p:username="ovdigital" p:password="12345"> 
    </bean> 

    <bean id="entityManagerFactory" 
     class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"> 
     <property name="dataSource" ref="ovdigitalDS" /> 
     <property name="jpaVendorAdapter"> 
      <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" /> 
     </property> 
    </bean> 

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

    <tx:annotation-driven transaction-manager="transactionManager" /> 
    <context:spring-configured /> 
    <context:annotation-config /> 

</beans>

而且我的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="ovdigitalPU"> 
     <provider>org.hibernate.ejb.HibernatePersistence</provider> 
     <properties> 
      <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/> 
      <property name="hibernate.transaction.auto_close_session" value="false"/> 
      <property name="hibernate.show_sql" value="true"/> 
      <property name="hibernate.format_sql" value="false"/> 
      <property name="hibernate.generate_statistics" value="false"/> 
      <property name="hibernate.connection.autocommit" value="true"/> 
      <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/> 
     </properties> 
     </persistence-unit> 
    </persistence>

在調試模式下，當服務器嘗試執行此行 - entityManager.persist（user）;我得到這個異常javax.persistence.TransactionRequiredException：沒有事務性的EntityManager可用。

我能做些什麼來解決我的問題？

來源

2014-12-03 Vítor Nóbrega

您使用哪種交易註釋？檢查你的進口應該是彈簧 – 2014-12-03 12:24:04

我使用的是來自spring的事務（import org.springframework.transaction.annotation.Transactional） – 2014-12-03 14:43:10

但是異常是「javax.persistence.TransactionRequiredException .:沒有事務性的EntityManager可用」。爲什麼服務器不使用spring的事務？ – 2014-12-03 14:45:01

這是驚人的，但對我的方法的簽名就完全不同：

@Transactional 
void save(Entity entity) //throw No transactional EntityManager available

和

@Transactional 
public void save(Entity entity) //ok

來源

2015-07-20 03:31:10 axetroll

，因爲你在你的第一個案例中它的私人方法和@Transactional沒有影響非公共方法 – 2017-04-10 12:32:38

我就遇到了這個和別的解決了這個問題對我來說。

我正在使用全Java配置（no-xml）並忘記了我的配置類中的@EnableTransactionManagement註釋。而已。

來源

2015-12-22 18:44:45 csturtz

Spring - PersistenceContext - 沒有事務性的EntityManager可用

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