在Spring 3.1中配置JDO？

Question

我曾经让我所有的DAO延伸JdoDaoSupport类，现在deprecated in Spring 3.1。我已经制作了我自己的AbstractJdoDao课程，它包装了PersistenceManagerFactory，并且所有的DAO从那里延伸。这是我应该怎么做的方式？

同样在documentation on JDO中，似乎PersistenceManagerFactory的直接实例化不是默认选项，而是使用LocalPersistenceManagerFactoryBean包装在TransactionAwarePersistenceManagerFactoryProxy中。如何正确实例化这些bean，并使它们与Spring的@Transactional注释一起工作。

这里是我的应用程序上下文的持久性相关的部分：

<bean id="persistenceManagerFactoryProxy" class="org.springframework.orm.jdo.TransactionAwarePersistenceManagerFactoryProxy"> 
    <property name="targetPersistenceManagerFactory"> 
     <bean class="org.springframework.orm.jdo.LocalPersistenceManagerFactoryBean"> 
      <property name="jdoPropertyMap"> 
       <props> 
        <prop key="javax.jdo.PersistenceManagerFactoryClass">org.datanucleus.store.appengine.jdo.DatastoreJDOPersistenceManagerFactory</prop> 
        <prop key="javax.jdo.option.ConnectionURL">appengine</prop> 
        <prop key="javax.jdo.option.NontransactionalRead">true</prop> 
        <prop key="javax.jdo.option.NontransactionalWrite">false</prop> 
        <prop key="javax.jdo.option.RetainValues">false</prop> 
        <prop key="javax.jdo.option.DetachAllOnCommit">true</prop> 
        <prop key="javax.jdo.option.Multithreaded">true</prop> 
        <prop key="datanucleus.appengine.ignorableMetaDataBehavior">NONE</prop> 
       </props> 
      </property> 
     </bean> 
    </property> 
    <property name="allowCreate" value="false" /> 
</bean> 

<tx:annotation-driven transaction-manager="transactionManager" /> 

<bean id="transactionManager" class="org.springframework.orm.jdo.JdoTransactionManager"> 
    <property name="persistenceManagerFactory" ref="persistenceManagerFactoryProxy" /> 
</bean> 

现在，当我打开一个页面访问的数据存储：

org.springframework.transaction.CannotCreateTransactionException: Could not open JDO PersistenceManager for transaction; nested exception is java.lang.IllegalStateException: No JDO PersistenceManager bound to thread, and configuration does not allow creation of non-transactional one here 
    at org.springframework.orm.jdo.JdoTransactionManager.doBegin(JdoTransactionManager.java:369) ~[spring-orm-3.1.0.RELEASE.jar:3.1.0.RELEASE] 
    at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:371) ~[spring-tx-3.1.0.RELEASE.jar:3.1.0.RELEASE] 
    at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:335) ~[spring-tx-3.1.0.RELEASE.jar:3.1.0.RELEASE] 
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:105) ~[spring-tx-3.1.0.RELEASE.jar:3.1.0.RELEASE] 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) ~[spring-aop-3.1.0.RELEASE.jar:3.1.0.RELEASE] 
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202) ~[spring-aop-3.1.0.RELEASE.jar:3.1.0.RELEASE] 
    at $Proxy15.queryAll(Unknown Source) ~[na:na] 
    ... 
Caused by: java.lang.IllegalStateException: No JDO PersistenceManager bound to thread, and configuration does not allow creation of non-transactional one here 
    at org.springframework.orm.jdo.PersistenceManagerFactoryUtils.doGetPersistenceManager(PersistenceManagerFactoryUtils.java:153) ~[spring-orm-3.1.0.RELEASE.jar:3.1.0.RELEASE] 
    at org.springframework.orm.jdo.TransactionAwarePersistenceManagerFactoryProxy$PersistenceManagerFactoryInvocationHandler.invoke(TransactionAwarePersistenceManagerFactoryProxy.java:159) ~[spring-orm-3.1.0.RELEASE.jar:3.1.0.RELEASE] 
    at $Proxy13.getPersistenceManager(Unknown Source) ~[na:na] 
    at org.springframework.orm.jdo.JdoTransactionManager.doBegin(JdoTransactionManager.java:308) ~[spring-orm-3.1.0.RELEASE.jar:3.1.0.RELEASE] 
... 73 common frames omitted 

我有my example project on GitHub。它使用的是Google App Engine，因此要么通过Eclipse中的mvn gae:run（通过Google Plugin for Eclipse）运行它，首先通过mvn eclipse:eclipse创建一个Eclipse项目。

Answer 1

我的建议是按照Spring 3.1文档的建议使用TransactionAwarePersistenceManagerFactoryProxy或SpringPersistenceManagerProxyBean。看起来这是为了取代JdoDaoSupport类而设计的。

虽然你在建立你自己的AbstractJdoDao包装的问题上的建议当然会消除弃用警告，但我唯一担心的是你可能无意中造成了难以维护的情况，因为它不会是他们习惯看什么。

在另一方面，我想创建自己的包装是解决你的问题非常快速的方式...

你应该仔细权衡使用自己的包装与优势/劣势的优势/劣势推动Spring 3.1的做事方式。根据我的经验，采取捷径可能而且往往会在未来困扰着你。