Java 弹簧&x2B；GAE spring容器的初始化不正确

我正试图编写一个使用Spring+GAE启用的aoolication，但我遇到了一个非常奇怪的问题

对于具有以下persistence.xml文件的持久层I用户JPA：

<?xml version="1.0" encoding="UTF-8" ?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/persistence 
                        http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" 
    version="1.0">

    <persistence-unit name="transactions-optional">
        <provider>org.datanucleus.store.appengine.jpa.DatastorePersistenceProvider</provider>
        <properties>
            <property name="datanucleus.NontransactionalRead" value="true" />
            <property name="datanucleus.NontransactionalWrite" value="true" />
            <property name="datanucleus.ConnectionURL" value="appengine" />
        </properties>
    </persistence-unit>

</persistence>

然后我查看了日志，我可以看到entityManagerFactory在DAO初始化之前成功创建了，但就在DAO对象的实际初始化开始之前，spring只是销毁了所有的单例，包括这个单例。有很多日志，但我确信entityManagerFactory也会创建，有一件事我很奇怪，那就是为什么spring会用以下日志消息销毁所有单例：

    INFO: Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@1594a88: defining beans [org.springframework.aop.config.internalAutoProxyCreator,org.springframework.transaction.annotation.AnnotationTransactionAttributeSource#0,org.springframework.transaction.interceptor.TransactionInterceptor#0,org.springframework.transaction.config.internalTransactionAdvisor,entityManagerFactory,transactionManager,datastoreService,memcacheServiceUser,org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,org.springframework.context.annotation.internalPersistenceAnnotationProcessor,userDaoJpa,employeeDS,messageSource]; root of factory hierarchy
Jan 14, 2011 11:12:12 AM org.springframework.beans.factory.support.DisposableBeanAdapter destroy
FINE: Invoking destroy() on bean with name 'entityManagerFactory'
Jan 14, 2011 11:12:12 AM org.springframework.orm.jpa.AbstractEntityManagerFactoryBean destroy
INFO: Closing JPA EntityManagerFactory for persistence unit 'transactions-optional'
Jan 14, 2011 11:12:12 AM org.springframework.web.context.ContextLoader initWebApplicationContext
SEVERE: Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userDaoJpa' defined in file 

---

类JpaDaoSupport希望您在构造时设置

EntityManagerFactory

或

JpaTemplate

。像这样的东西应该可以做到：

@Repository
public class YourDAOImpl extends JpaDaoSupport implements YourDAO
{
    @Autowired
    public YourDAOImpl(EntityManagerFactory entityManagerFactory)
    {
        setEntityManagerFactory(entityManagerFactory);
    }

    ...
}

---

您可以使用以下命令自动插入实体管理器

@PersistenceContext
private EntityManager entityManager;

---

每个都由Dao实现。

由于启动失败，单例正在被销毁。这与你的问题无关。另外，请向我们展示

IllegalArgumentException

的完整堆栈跟踪，而不仅仅是您发布的代码片段。

@Repository
public class YourDAOImpl extends JpaDaoSupport implements YourDAO
{
    @Autowired
    public YourDAOImpl(EntityManagerFactory entityManagerFactory)
    {
        setEntityManagerFactory(entityManagerFactory);
    }

    ...
}

@PersistenceContext
private EntityManager entityManager;

@Autowired
public ClaseDaoImpl(EntityManagerFactory entityManagerFactory) {
    setEntityManagerFactory(entityManagerFactory);
}