Spring 3.1 + Hibernate 4.1 JPA，实体管理器工厂已注册两次

Question

我使用带有Hibernate 4.1的Spring Framework
3.1作为JPA提供程序，并且具有完整的功能设置，但是每次启动Web应用程序时，我都会看到以下警告消息：

14:28:12,725  WARN pool-2-thread-12 internal.EntityManagerFactoryRegistry:80 - HHH000436: Entity manager factory name (something) is already registered.  If entity manager will be clustered or passivated, specify a unique value for property 'hibernate.ejb.entitymanager_factory_name'

该应用程序正常运行，但是像这样的警告消息困扰着我，数小时的搜索，调整和试验使我无所适从。我试过更改工厂名称并添加和省略配置块，但无济于事。看来，Spring或Hibernate中的某些东西只是两次初始化了实体管理器工厂。

仅供参考，我正在使用LocalContainerEntityManagerFactoryBean的packagesToScan功能来配置实体管理器，而没有persistence.xml文件。

我已经将Spring上下文XML缩减为以下内容，问题仍然存在：

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

  <context:property-placeholder location="classpath:jdbc.properties"/>
  <bean id="dataSource" class="org.apache.tomcat.jdbc.pool.DataSource" destroy-method="close">
    <property name="driverClassName" value="${jdbc.nightsword.driverClassName}"/>
    <property name="url" value="${jdbc.nightsword.url}"/>
    <property name="username" value="${jdbc.nightsword.username}"/>
    <property name="password" value="${jdbc.nightsword.password}"/>
  </bean>

  <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="jpaVendorAdapter">
      <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"/>
    </property>
    <property name="dataSource" ref="dataSource"/>
    <property name="packagesToScan" value="x.y"/>
  </bean>
</beans>

为了完整起见，这里是hibernate.properties：

hibernate.dialect=org.hibernate.dialect.MySQL5Dialect
hibernate.ejb.entitymanager_factory_name=something

这是org.springframework.orm和org.hibernate的摘录调试级别日志输出。您可以看到如何在14：40：06,911首次注册EntityManagerFactory，然后此后立即出现，LocalContainerEntityManagerFactoryFactoryBean从头开始。嗯

INFO: Deploying web application archive /opt/local/share/java/tomcat7/webapps/nightsword.war
14:40:06,149  INFO pool-2-thread-13 jpa.LocalContainerEntityManagerFactoryBean:264 - Building JPA container EntityManagerFactory for persistence unit 'default'
14:40:06,219 DEBUG pool-2-thread-13 type.BasicTypeRegistry:143 - Adding type registration boolean -> org.hibernate.type.BooleanType@4cb91eff

...

14:40:06,882 DEBUG pool-2-thread-13 internal.SessionFactoryRegistry:62 - Initializing SessionFactoryRegistry : org.hibernate.internal.SessionFactoryRegistry@161bb7fe
14:40:06,882 DEBUG pool-2-thread-13 internal.SessionFactoryRegistry:75 - Registering SessionFactory: a3219dd8-7d59-45ac-9a5a-0d13e38dbb04 (<unnamed>)
14:40:06,882 DEBUG pool-2-thread-13 internal.SessionFactoryRegistry:82 - Not binding SessionFactory to JNDI, no JNDI name configured
14:40:06,882 DEBUG pool-2-thread-13 internal.SessionFactoryImpl:487 - Instantiated session factory
14:40:06,882 DEBUG pool-2-thread-13 internal.SessionFactoryImpl:1119 - Checking 0 named HQL queries
14:40:06,883 DEBUG pool-2-thread-13 internal.SessionFactoryImpl:1142 - Checking 0 named SQL queries
14:40:06,887 DEBUG pool-2-thread-13 internal.StatisticsInitiator:110 - Statistics initialized [enabled=false]
14:40:06,910 DEBUG pool-2-thread-13 internal.EntityManagerFactoryRegistry:56 - Initializing EntityManagerFactoryRegistry : org.hibernate.ejb.internal.EntityManagerFactoryRegistry@75cc9008
14:40:06,911 DEBUG pool-2-thread-13 internal.EntityManagerFactoryRegistry:66 - Registering EntityManagerFactory: something 
14:40:06,967  INFO pool-2-thread-13 jpa.LocalContainerEntityManagerFactoryBean:264 - Building JPA container EntityManagerFactory for persistence unit 'default'
14:40:06,967 DEBUG pool-2-thread-13 type.BasicTypeRegistry:143 - Adding type registration boolean -> org.hibernate.type.BooleanType@4cb91eff

...

14:40:07,128 DEBUG pool-2-thread-13 internal.SessionFactoryRegistry:75 - Registering SessionFactory: 81a9b5a6-83aa-46ee-be68-d642e6fda584 (<unnamed>)
14:40:07,128 DEBUG pool-2-thread-13 internal.SessionFactoryRegistry:82 - Not binding SessionFactory to JNDI, no JNDI name configured
14:40:07,129 DEBUG pool-2-thread-13 internal.SessionFactoryImpl:487 - Instantiated session factory
14:40:07,129 DEBUG pool-2-thread-13 internal.SessionFactoryImpl:1119 - Checking 0 named HQL queries
14:40:07,129 DEBUG pool-2-thread-13 internal.SessionFactoryImpl:1142 - Checking 0 named SQL queries
14:40:07,129 DEBUG pool-2-thread-13 internal.StatisticsInitiator:110 - Statistics initialized [enabled=false]
14:40:07,130 DEBUG pool-2-thread-13 internal.EntityManagerFactoryRegistry:66 - Registering EntityManagerFactory: something 
14:40:07,130  WARN pool-2-thread-13 internal.EntityManagerFactoryRegistry:80 - HHH000436: Entity manager factory name (something) is already registered.  If entity manager will be clustered or passivated, specify a unique value for property 'hibernate.ejb.entitymanager_factory_name'

Answer 1

您如何初始化Spring Application Context？您正在使用Spring MVC吗？

我有时看到Spring MVC
XML配置导入其他应用程序。上下文XML，导致将某些bean实例化两次，因为它们是在应用程序上下文和Web应用程序上下文中声明的。