在使用Spring 3 + Hibernate JPA时发现JPA注释类(Discover JPA annotated classes when using Spring 3+Hibernate JPA)

 我有一个使用Spring 3 + Hibernate JPA堆栈的Web应用程序。 
 
 我想知道是否有办法让Hibernate自动发现@Entity带注释的类，这样我就不必在persistence.xml文件中列出它们。 我的@Entity注释类“活着”在位于我的Web应用程序的WEB-INF / lib中的单独的jar中。 
 
 这是我的Spring配置文件中的一个片段： 
 
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
   <property name="persistenceUnitName" value="mypersistence"/>
   <property name="dataSource" ref="dataSource"/>
   <property name="jpaVendorAdapter">
       <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
           <property name="showSql" value="true"/>
           <property name="generateDdl" value="true"/>
           <property name="databasePlatform" value="org.hibernate.dialect.DerbyDialect"/>
       </bean>
   </property>
</bean>

<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="org.apache.derby.jdbc.ClientDriver"/>
    <property name="url" value="jdbc:derby://localhost:1527/library;create=true"/>
    <property name="username" value="app"/>
    <property name="password" value="app"/>
</bean>

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

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

I have a web application using the Spring 3 + Hibernate JPA stack.
 
I would like to know if there is a way to have Hibernate to automatically discover @Entity annotated classes, so that I don't have to list them in the persistence.xml file. My @Entity annotated classes "live" in a separate jar, located in the WEB-INF/lib of my web application.
 
This is a snippet from my Spring configuration file:
 
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
   <property name="persistenceUnitName" value="mypersistence"/>
   <property name="dataSource" ref="dataSource"/>
   <property name="jpaVendorAdapter">
       <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
           <property name="showSql" value="true"/>
           <property name="generateDdl" value="true"/>
           <property name="databasePlatform" value="org.hibernate.dialect.DerbyDialect"/>
       </bean>
   </property>
</bean>

<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="org.apache.derby.jdbc.ClientDriver"/>
    <property name="url" value="jdbc:derby://localhost:1527/library;create=true"/>
    <property name="username" value="app"/>
    <property name="password" value="app"/>
</bean>

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

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

原文：https://stackoverflow.com/questions/4872705