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我使用Spring框架3.1與Hibernate 4.1作爲JPA提供者，和我擁有全面的功能設置，但每一個Web應用程序啓動時，我看到這個警告消息：春3.1 + Hibernate的JPA 4.1，實體管理器工廠被註冊了兩次
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'
應用功能就好了，但這樣的打擾我警告消息，並且搜索和調整和試驗的時間都使我無處。我試着改變工廠名稱添加和省略的配置塊，都無濟於事。看來Spring或Hibernate中的某些東西只是初始化實體管理器工廠兩次。
僅供參考，我使用的LocalContainerEntityManagerFactoryBean的packagesToScan功能配置實體管理器，而不persistence.xml文件。
我相比下來我的Spring上下文XML以下和問題仍然存在：
<?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>
爲了完整起見，這裏的hibernate.properties：
hibernate.dialect=org.hibernate.dialect.MySQL5Dialect
hibernate.ejb.entitymanager_factory_name=something
，這裏是摘錄的調試級別的日誌來自org.springframework.orm和org.hibernate的輸出。你可以看到如何在14：40：06911 EntityManagerFactory是從第一次註冊，此後立即LocalContainerEntityManagerFactoryBean似乎從一開始就從頭開始。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應用程序上下文？你的web.xml中聲明瞭org.springframework.web.context.ContextLoaderListener嗎？你在使用Spring MVC嗎？我有時會看到Spring MVC XML配置導入其他應用程序。背景XML，造成兩次實例化一些豆子，因爲它們是在應用程序上下文和Web應用程序上下文中聲明。 – eolith
是的，我是，你釘了它。 DispatcherServlet加載了與ContextLoaderListener相同的上下文文件，並加載了兩次bam，beans。新手錯誤，多麼尷尬！如果您想將您的評論改爲回答，我很樂意接受它。謝謝！ –
我們都是初學者，沒什麼好羞恥的。 – eolith