在Spring 3.1中配置JDO？

Question

我曾經讓我所有的DAO延伸JdoDaoSupport類，現在deprecated in Spring 3.1。我已經制作了我自己的AbstractJdoDao課程，它包裝了PersistenceManagerFactory，並且所有的DAO從那裏延伸。這是我應該怎麼做的方式？

同樣在documentation on JDO中，似乎PersistenceManagerFactory的直接實例化不是默認選項，而是使用LocalPersistenceManagerFactoryBean包裝在TransactionAwarePersistenceManagerFactoryProxy中。如何正確實例化這些bean，並使它們與Spring的@Transactional註釋一起工作。

這裏是我的應用程序上下文的持久性相關的部分：

<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> 

現在，當我打開一個頁面訪問的數據存儲：

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，因此要麼通過Eclipse中的mvn gae:run（通過Google Plugin for Eclipse）運行它，首先通過mvn eclipse:eclipse創建一個Eclipse項目。

Answer 1

我的建議是按照Spring 3.1文檔的建議使用TransactionAwarePersistenceManagerFactoryProxy或SpringPersistenceManagerProxyBean。看起來這是爲了取代JdoDaoSupport類而設計的。

雖然你在建立你自己的AbstractJdoDao包裝的問題上的建議當然會消除棄用警告，但我唯一擔心的是你可能無意中造成了難以維護的情況，因爲它不會是他們習慣看什麼。

在另一方面，我想創建自己的包裝是解決你的問題非常快速的方式...

你應該仔細權衡使用自己的包裝與優勢/劣勢的優勢/劣勢推動Spring 3.1的做事方式。根據我的經驗，採取捷徑可能而且往往會在未來困擾着你。