java Spring+GAE错误初始化Spring容器
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
对于持久性层I,用户JPA具有以下持久性。xml文件:
<?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>
我还有一个spring配置文件,其中包含以下声明:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">
<tx:annotation-driven />
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean">
<property name="persistenceUnitName" value="transactions-optional" />
</bean>
<bean name="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>
<bean id="datastoreService" class="com.google.appengine.api.datastore.DatastoreServiceFactory" factory-method="getDatastoreService" />
<bean id="memcacheServiceUser" class="com.google.appengine.api.memcache.MemcacheServiceFactory" factory-method="getMemcacheService">
<constructor-arg value="UserCache"/>
</bean>
</beans>
最后,我有一个DAO组件,它被标记为ad@Repository,并扩展了JpaDaoSupport,这个bean被配置为扫描
尝试初始化该DAO bean后,我收到以下异常:
Caused by: java.lang.IllegalArgumentException: entityManagerFactory or jpaTemplate is required
at org.springframework.orm.jpa.support.JpaDaoSupport.checkDaoConfig(JpaDaoSupport.java:120)
at org.springframework.dao.support.DaoSupport.afterPropertiesSet(DaoSupport.java:44)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$5.run(AbstractAutowireCapableBeanFactory.java:1467)
at java.security.AccessController.doPrivileged(Native Method)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1465)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1417)
... 30 more
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
# 1 楼答案
您可以使用以下命令自动插入实体管理器
# 2 楼答案
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:# 3 楼答案
每个都是由Dao实现的