我有一个使用 spring 和 hibernate 来支持 JPA 的 Web 应用程序,但是当我打开我的索引页面时,出现了这个异常:
但我认为我的 applicationContext.xml 配置良好,但我还是发布它只是为了确定:
<?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:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx" xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
">
<!-- properties file for jdbc database access details / -->
<context:property-placeholder location="classpath:jdbc.properties" />
<!-- enabling annotation driven configuration / -->
<context:annotation-config />
<context:component-scan base-package="com.maegul" />
<tx:annotation-driven transaction-manager="transactionManager" />
<bean
class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource"
p:driverClassName="${jdbc.driverClassName}" p:url="${jdbc.url}"
p:username="${jdbc.username}" p:password="${jdbc.password}" />
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"
p:entityManagerFactory-ref="entityManagerFactory" />
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"
p:dataSource-ref="dataSource" p:jpaVendorAdapter-ref="jpaAdapter">
<property name="loadTimeWeaver">
<bean
class="org.springframework.instrument.classloading.InstrumentationLoadTimeWeaver" />
</property>
<property name="persistenceUnitName" value="maegul"></property>
</bean>
<bean id="jpaAdapter"
class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"
p:database="${jpa.database}" p:showSql="${jpa.showSql}" />
</beans>
我真的不知道出了什么问题,我一直在改变一些小东西但无济于事,我们将不胜感激。
编辑(在 pastebin 中使用长堆栈以便于阅读...)
更改了 ApplicationContext.xml 中的一些内容,现在我得到了不同的堆栈跟踪:
INFO - Server - jetty-7.5.0.v20110901
INFO - tandardDescriptorProcessor - NO JSP Support for {}, did not find {}
INFO - / - Initializing Spring root WebApplicationContext
INFO - ContextLoader - Root WebApplicationContext: initialization started
INFO - XmlWebApplicationContext - Refreshing Root WebApplicationContext: startup date [Sun Nov 06 13:22:53 COT 2011]; root of context hierarchy
INFO - XmlBeanDefinitionReader - Loading XML bean definitions from ServletContext resource [/WEB-INF/ApplicationContext.xml]
INFO - DefaultListableBeanFactory - Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@40871449: defining beans [maegulApplication,itemService,userService,cartItemDao,mediaItemDao,mediaSourceDao,passwordDao,userDao,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]; root of factory hierarchy
INFO - DefaultListableBeanFactory - Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@40871449: defining beans [maegulApplication,itemService,userService,cartItemDao,mediaItemDao,mediaSourceDao,passwordDao,userDao,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]; root of factory hierarchy
ERROR - ContextLoader - Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'itemService': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.maegul.data.dao.impl.MediaItemDao com.maegul.service.implementation.ItemFindService.mediaItemDao; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mediaItemDao': Injection of persistence dependencies failed; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No unique bean of type [javax.persistence.EntityManagerFactory] is defined: expected single bean but found 0
堆栈的其余部分在这里:http://pastebin.com/u82n3C5n
我看到我所做的 Annotations 正在被识别,但看起来它仍然找不到 entityManagerFactory。我看到的一件事是,也许我应该在我的 EntityManager
字段中使用 @PersistenceUnit
而不是使用 @PersistenceContext
,但我不知道。 ..
编辑 2
我所有的 DAO 实现都是这样的:
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
import org.springframework.stereotype.Repository;
import com.maegul.data.dao.AbstractDAO;
import com.maegul.data.entities.MediaItem;
@Repository(value = "mediaItemDao")
public class MediaItemDaoImpl extends AbstractDAO<MediaItem> implements
MediaItemDao {
@PersistenceContext
private EntityManager em;
/*
* (non-Javadoc)
*
* @see com.maegul.data.dao.DAO#getEntityManager()
*/
public EntityManager getEntityManager() {
return em;
}
/*
* (non-Javadoc)
*
* @see com.maegul.data.dao.DAO#getClazz()
*/
public Class<MediaItem> getClazz() {
return MediaItem.class;
}
/*
* (non-Javadoc)
*
* @see com.maegul.data.dao.impl.MediaItemDao#findByName(java.lang.String)
*/
public MediaItem findByName(String name) {
Query q = getEntityManager().createQuery(
"select u from " + getClazz() + " where u.name = :name");
q.setParameter("name", name);
return (MediaItem) q.getSingleResult();
}
/*
* (non-Javadoc)
*
* @see com.maegul.data.dao.impl.MediaItemDao#findByType(java.lang.String)
*/
@SuppressWarnings("unchecked")
public List<MediaItem> findByType(String type) {
Query q = getEntityManager().createQuery("select u from " + getClazz() + " where u.type = :type");
q.setParameter("type", type);
return q.getResultList();
}
}
编辑 3
这是 AbstractDAO 类:http://pastebin.com/f2BQG9RE
这是DAO接口(interface),由AbstractDAO实现:http://pastebin.com/h7dAHTTC
这是 MEdiaItemDao 接口(interface):
import java.util.List;
import com.maegul.data.dao.DAO;
import com.maegul.data.entities.MediaItem;
public interface MediaItemDao extends DAO<MediaItem>{
MediaItem findByName(String name);
List<MediaItem> findByType(String type);
}
最佳答案
它只需要清理一个项目,所以我做了并修复了它。
关于Spring 找不到名为 entityManagerFactory 的 bean,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/8028240/