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我使用Spring框架3.1与Hibernate 4.1作为JPA提供者，和我拥有全面的功能设置，但每一个Web应用程序启动时，我看到这个警告消息：春3.1 + Hibernate的JPA 4.1，实体管理器工厂被注册了两次
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'
应用功能就好了，但这样的打扰我警告消息，并且搜索和调整和试验的时间都使我无处。我试着改变工厂名称添加和省略的配置块，都无济于事。看来Spring或Hibernate中的某些东西只是初始化实体管理器工厂两次。
仅供参考，我使用的LocalContainerEntityManagerFactoryBean的packagesToScan功能配置实体管理器，而不persistence.xml文件。
我相比下来我的Spring上下文XML以下和问题仍然存在：
<?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，这里的hibernate.properties：
hibernate.dialect=org.hibernate.dialect.MySQL5Dialect
hibernate.ejb.entitymanager_factory_name=something
，这里是摘录的调试级别的日志来自org.springframework.orm和org.hibernate的输出。你可以看到如何在14：40：06911 EntityManagerFactory是从第一次注册，此后立即LocalContainerEntityManagerFactoryBean似乎从一开始就从头开始。呵呵。
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 -> [email protected]
...
14:40:06,882 DEBUG pool-2-thread-13 internal.SessionFactoryRegistry:62 - Initializing SessionFactoryRegistry : [email protected]
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 : [email protected]
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 -> [email protected]
...
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'
你如何初始化你的Spring应用程序上下文？你的web.xml中声明了org.springframework.web.context.ContextLoaderListener吗？你在使用Spring MVC吗？我有时会看到Spring MVC XML配置导入其他应用程序。背景XML，造成两次实例化一些豆子，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。 – eolith
是的，我是，你钉了它。 DispatcherServlet加载了与ContextLoaderListener相同的上下文文件，并加载了两次bam，beans。新手错误，多么尴尬！如果您想将您的评论改为回答，我很乐意接受它。谢谢！ –
我们都是初学者，没什么好羞耻的。 – eolith