当我尝试从控制器自动装配接口时,我得到以下异常: 堆栈跟踪:
Could not autowire field: com.projectShaun.service.AccountService com.projectShaun.controller.HomeController.accountService; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'accountService': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.projectShaun.dao.AccountDao com.projectShaun.service.AccountServiceImpl.accountDao; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'accountDao': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: org.hibernate.SessionFactory com.projectShaun.dao.AccountDaoImpl.sessionFactory; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.hibernate.SessionFactory] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
我的控制器看起来像这样:
package com.projectShaun.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import com.projectShaun.service.AccountService;
@Controller
public class HomeController {
@Autowired
AccountService accountService;
@RequestMapping("/")
public ModelAndView welcome() {
ModelAndView modelAndView = new ModelAndView("welcome");
modelAndView.addObject("greeting", "Welcome to projectShaun!");
return modelAndView;
}
}
我的应用程序上下文:
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:task="http://www.springframework.org/schema/task"
xsi:schemaLocation="http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.2.xsd
http://www.springframework.org/schema/jee
http://www.springframework.org/schema/jee/spring-jee-3.2.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
http://www.springframework.org/schema/task
http://www.springframework.org/schema/task/spring-task-3.2.xsd" >
<context:component-scan base-package="com.projectShaun.controller" />
<tx:annotation-driven/>
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/projectshaun" />
<property name="username" value="root" />
<property name="password" value="" />
</bean>
<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource"></property>
<property name="annotatedClasses">
<list>
<value>com.projectShaun.model.Account</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop
key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
<prop key="hibernate.show_sql">true</prop>
</props>
</property>
</bean>
<bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager"
p:sessionFactory-ref="sessionFactory">
</bean>
</beans>
我不确定为什么会抛出这个异常,我不确定它是否与上下文有关:组件扫描库。我尝试将com.projectShaun
作为基础包。
AccountDAO:
package com.projectShaun.dao;
import com.projectShaun.model.Account;
public interface AccountDao {
void persistAccount (Account account);
}
答案 0 :(得分:0)
只有一个Spring托管对象可以Autowire
另一个组件/服务/存储库,SO AccountDao
需要作为具有@Named
或@Component
的Spring bean进行分配。
答案 1 :(得分:0)
问题在于,由于缺少依赖性,Spring无法创建Bean
例外是 org.springframework.beans.factory.NoSuchBeanDefinitionException:没有 找到类型[org.hibernate.SessionFactory]的限定bean 依赖:预计至少有1个bean有资格成为autowire 这种依赖的候选人。依赖注释: {@ org.springframework.beans.factory.annotation.Autowired(所需=真)
明确指出它没有为SessionFactory配置bean。
这是AccountDaoImpl.sessionFactory
所要求的。