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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

更新时间：2023-07-08 17:07

最满意答案

 我不确定你是否看到他们，但仔细看看这些引号：  
[1,'1','3/03/2011', [“ScrewDriver”, “Hammer”, “Stone”]]
 
 这是有区别的：  
”
 
 和这个：  
"
 
 第一个（ ” ）是一个引用解释器的引用。 使用普通引号（ " ）并回传你的脚本返回的内容。  
 另外，这个return语句做了什么：  
return (new)
 
 如果你在函数中，函数会在列表的第一次迭代时退出，因为它会在每一个循环中return ，但是只有第一个被捕获并且函数在那里死掉。  
 我将return语句向下移动一级，所以它不是for循环的一部分。 所以改变这个：  
for line in lines:
    listline=eval(line)
    if not(num_del==list_line[0]):
        new +=(line + "\n")
    return (new)
 
 为此：  
for line in lines:
    listline=eval(line)
    if not(num_del==list_line[0]):
        new +=(line + "\n")

return (new)
 
 
 这是没有引号的文本文件。 尝试复制并粘贴它：  
[99 ,1, "3/03/2011", ["ScrewDriver", "Hammer", "Stone"]]
[2 ,2, "3/03/2011", ["hammer,nails"]]
[31 ,2, "3/03/2011", ["plaster,studd"]]
[100 ,2, "3/03/2011", ["hammer,studd"]]

I'm not sure if you see them, but look closely at those quotation marks: 
[1,'1','3/03/2011', [“ScrewDriver”, “Hammer”, “Stone”]]
 
There's a difference between this: 
”
 
and this: 
"
 
The first one (”) is a curly quote, which screws up the interpreter. Use normal quotes (") and post back what your script returns then. 
Also, what does this return statement do: 
return (new)
 
If you're in a function, the function will quit upon the first iteration of the list, as it returns every single loop, but only the first one is caught and the function dies there. 
I'd move the return statement down a level so it isn't part of the for loop. So change this: 
for line in lines:
    listline=eval(line)
    if not(num_del==list_line[0]):
        new +=(line + "\n")
    return (new)
 
To this: 
for line in lines:
    listline=eval(line)
    if not(num_del==list_line[0]):
        new +=(line + "\n")

return (new)
 
 
This is your text file without the curly quotes. Try copy and pasting it: 
[99 ,1, "3/03/2011", ["ScrewDriver", "Hammer", "Stone"]]
[2 ,2, "3/03/2011", ["hammer,nails"]]
[31 ,2, "3/03/2011", ["plaster,studd"]]
[100 ,2, "3/03/2011", ["hammer,studd"]]

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

最满意答案

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