没有可用于当前线程的实际事务的EntityManager - 无法可靠地处理“刷新”调用

时间：2017-01-17 19:16:07

标签： java spring hibernate jpa transactions

一些背景信息：我正在尝试将一个大项目从Hibernate 3.6.8迁移到5.2.5（包括JPA升级2.0到2.1），Spring 3.2.3到4.3.5并且面临严重问题。到目前为止，Spring和Hibernate的配置还没有改变，并且在旧版本上运行良好，但是我自己无法解决升级问题。

  

我得到的例外是：

2017-01-16 10:15:25,635 ERROR [[ACTIVE] ExecuteThread: '15' for queue: 'weblogic.kernel.Default (self-tuning)'] org.myproject.common.messaging.BaseMDB: Code: (11702) Source: (Common) Exception caught - Exception org.springframework.dao.InvalidDataAccessApiUsageException in org.myproject.core.processing.message.MessageReceiverImpl caught
org.springframework.dao.InvalidDataAccessApiUsageException: No EntityManager with actual transaction available for current thread - cannot reliably process 'flush' call; nested exception is javax.persistence.TransactionRequiredException: No EntityManager with actual transaction available for current thread - cannot reliably process 'flush' call
                at org.springframework.orm.jpa.EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(EntityManagerFactoryUtils.java:413)
                at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:246)
                at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible(AbstractEntityManagerFactoryBean.java:491)
                at org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible(ChainedPersistenceExceptionTranslator.java:59)
                at org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:213)
                at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:147)
                at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
                at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
                at com.sun.proxy.$Proxy187.flushAndClear(Unknown Source)
                at org.myproject.core.BasePersistenceMDB.synchronizeBackend(BasePersistenceMDB.java:46)
                at org.myproject.core.BasePersistenceMDB.onTextMessage(BasePersistenceMDB.java:32)
                at org.myproject.common.messaging.BaseMDB.evaluateJMSMessage(BaseMDB.java:100)
                at org.myproject.common.messaging.BaseMDB.onMessage(BaseMDB.java:51)
                at sun.reflect.GeneratedMethodAccessor591.invoke(Unknown Source)
                at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
                at java.lang.reflect.Method.invoke(Method.java:498)
                at com.bea.core.repackaged.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:310)
                at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
                at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
                at com.oracle.pitchfork.intercept.MethodInvocationInvocationContext.proceed(MethodInvocationInvocationContext.java:100)
                at com.oracle.pitchfork.intercept.JeeInterceptorInterceptor.invoke(JeeInterceptorInterceptor.java:117)
                at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
                at com.bea.core.repackaged.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
                at com.bea.core.repackaged.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
                at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
                at com.bea.core.repackaged.springframework.aop.framework.JdkDynamicAopProxy.invoke(Unknown Source)
                at com.sun.proxy.$Proxy121.onMessage(Unknown Source)
                at weblogic.ejb.container.internal.MDListener.execute(MDListener.java:451)
                at weblogic.ejb.container.internal.MDListener.transactionalOnMessage(MDListener.java:375)
                at weblogic.ejb.container.internal.TokenBasedJMSMessagePoller.processOneMessage(TokenBasedJMSMessagePoller.java:279)
                at weblogic.ejb.container.internal.TokenBasedJMSMessagePoller.run(TokenBasedJMSMessagePoller.java:121)
                at weblogic.work.SelfTuningWorkManagerImpl$WorkAdapterImpl.run(SelfTuningWorkManagerImpl.java:548)
                at weblogic.work.ExecuteThread.execute(ExecuteThread.java:311)
                at weblogic.work.ExecuteThread.run(ExecuteThread.java:263)
Caused by: javax.persistence.TransactionRequiredException: No EntityManager with actual transaction available for current thread - cannot reliably process 'flush' call
                at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:282)
                at com.sun.proxy.$Proxy163.flush(Unknown Source)
                at org.myproject.core.data.dao.impl.MyPersistenceContextImpl.flushAndClear(MyPersistenceContextImpl.java:49)
                at sun.reflect.GeneratedMethodAccessor616.invoke(Unknown Source)
                at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
                at java.lang.reflect.Method.invoke(Method.java:498)
                at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333)
                at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
                at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
                at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136)
                ... 28 more

我的配置如下： pom.xml（相关片段）： for Spring： 

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>4.3.5.RELEASE</version>
  </dependency>
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context-support</artifactId>
    <version>4.3.5.RELEASE</version>
  </dependency>
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-core</artifactId>
    <version>4.3.5.RELEASE</version>
  </dependency>
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-jdbc</artifactId>
    <version>4.3.5.RELEASE</version>
  </dependency>
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-orm</artifactId>
    <version>4.3.5.RELEASE</version>
  </dependency>
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-tx</artifactId>
    <version>4.3.5.RELEASE</version>
  </dependency>
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-web</artifactId>
    <version>4.3.5.RELEASE</version>
  </dependency>
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>4.3.5.RELEASE</version>
  </dependency>
   <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-test</artifactId>
    <version>4.3.5.RELEASE</version>
    <scope>test</scope>
  </dependency>
Hibernate的

： 

<dependency>
        <groupId>org.hibernate.common</groupId>
        <artifactId>hibernate-commons-annotations</artifactId>
        <version>5.0.1.Final</version>
      </dependency>
      <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
       <version>5.2.6.Final</version>
      </dependency>
      <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-entitymanager</artifactId>
        <version>5.2.6.Final</version>
      </dependency>
    <dependency>
        <groupId>org.hibernate.javax.persistence</groupId>
        <artifactId>hibernate-jpa-2.1-api</artifactId>
        <version>1.0.0.Final</version>
      </dependency>
      <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-jpamodelgen</artifactId>
        <version>5.2.6.Final</version>
        <scope>provided</scope>
      </dependency>

persistence.xml（完整）：（这里有些东西已被更改，但没有帮助：添加了jta-data-source，xsd版本已更新）

<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd"
             version="2.1">

    <persistence-unit name="MYPROJECT_PU" transaction-type="JTA">        
        <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
        <jta-data-source>myproject-ds_jndi</jta-data-source>

        <mapping-file>META-INF/named-queries.xml</mapping-file>

        <class>org.myproj.core.domain.Message</class>

    </persistence-unit>

</persistence>

appContext.xml（相关代码段）：（自升级以来在jpaProperties中添加了一个额外的属性）

<?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:tx="http://www.springframework.org/schema/tx" xmlns:jdbc="http://www.springframework.org/schema/jdbc"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context.xsd
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx.xsd
    http://www.springframework.org/schema/jdbc
    http://www.springframework.org/schema/jdbc/spring-jdbc.xsd">

...

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

    <bean
        class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor" />

    <bean
        class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="locations">
            <list>
                <value>classpath:configuration.properties</value>
                <value>classpath:externalized-queries.properties</value>
            </list>
        </property>
    </bean>

    <bean id="jndiDataSource" class="org.springframework.jndi.JndiObjectFactoryBean">
        <property name="jndiName" value="${datasourceJndiName}"></property>
    </bean>

    <!-- Indicates a JpaVendorAdapter implementation for Hibernate EntityManager. -->
    <bean id="jpaVendorAdapter"
        class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
        <property name="database" value="${databaseVendor}" />
        <property name="showSql" value="${showSql}" />
        <property name="generateDdl" value="${generateDdl}" />
        <property name="databasePlatform" value="${databaseDialect}" />
    </bean>

    <bean id="entityManagerFactory"
        class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="persistenceXmlLocation" value="${persistenceXmlFileLocation}" />
        <property name="persistenceUnitName" value="${persistenceUnitName}" />
        <property name="dataSource" ref="jndiDataSource" />
        <property name="jpaVendorAdapter" ref="jpaVendorAdapter" />
        <property name="jpaProperties">
            <props>
                <prop key="hibernate.transaction.manager_lookup_class">${transactionManagerLookupClass}</prop>
                <prop key="hibernate.transaction.jta.platform">org.hibernate.service.jta.platform.internal.WeblogicJtaPlatform</prop> <!-- this was newly added -->

            </props>
        </property>
    </bean>

    <tx:annotation-driven />

    <tx:jta-transaction-manager />

...

打开交易的类中的相关摘录，演示了此处使用的注释： 

import java.sql.SQLException;
import java.util.Set;

import javax.interceptor.Interceptors;

import org.springframework.ejb.interceptor.SpringBeanAutowiringInterceptor;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

...

@Interceptors(SpringBeanAutowiringInterceptor.class)
@Transactional(propagation = Propagation.REQUIRED)
public class DBLockingImpl implements Locking {

@Autowired
private DataSource dataSource;

这是调用entityManager的类（此时事务已经打开，但是当在EntityManager上调用flush方法时会发生异常）： 

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

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;


@Repository(value = "persistenceContext")
public class PersistenceContextImpl
    implements PersistenceContext {

    /**
     * Instance variable for EntityManager.
     */
    @PersistenceContext
    private EntityManager entityManager;

    @Override
    public void flushAndClear() {
        entityManager.flush();
        entityManager.clear();
    }
}

有人可以帮我解决这个问题吗？我不明白什么是遗漏的，为什么我得到那个例外。我得到的印象是Spring没有正确连接到Hibernates实体管理器，这就是异常的原因，因为trasanction本身似乎已经创建，但每当它试图保持这个异常过时。毕竟我觉得它不再适用它很奇怪，虽然它与这些框架的旧版本一起运行良好。旧版本的配置是否有任何重大变化？

2 个答案:

答案 0 :(得分：0)

我怀疑这可能是您的组件扫描或包扫描的问题。我在Spring配置文件中找不到包扫描代码。请检查或更新您的配置文件。

答案 1 :(得分：0)

扫描似乎有效。如果查看堆栈跟踪，您可以看到EntityManager Proxy（com.sun.proxy。$ Proxy163），并按预期转发到SharedEntityManagerCreator。

但是，在创建SharedEntityManager之前，它会检查是否存在事务，并且此检查失败。该事务应由@Transactional注释创建。这通过Spring AOP发生，创建扩展DBLockingImpl的GCLIB代理或实现Locking的JDK代理。这可以通过在方法内设置断点并查看callstack以查看方法的调用方式来确定。

查看DBLockingImpl我注意到你使用SpringBeanAutowiringInterceptor表明DBLockingImpl不是Spring bean，但你只是将Spring bean自动装入它。如果是这种情况，那么我认为这是你的问题，因为DBLockingImpl不会被代理AOP，因此不会应用@Transactional。

尝试将DBLockingImpl作为一个春天豆。

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