当我尝试从我的 Controller Autowiring 接口(interface)时,出现以下异常: 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 Controller 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;
}
}
还有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>
我不确定它为什么抛出这个异常,我不确定它是否与上下文有关:组件扫描基础。我尝试将 com.projectShaun
作为基本包。
账户数据:
package com.projectShaun.dao;
import com.projectShaun.model.Account;
public interface AccountDao {
void persistAccount (Account account);
}
最佳答案
异常说:
- 你正确地(尝试)在你的
HomeController
bean 中 Autowiring 一个accountService
bean - 你正确地(尝试)在
accountService
中 Autowiring 一个AccountDAO
但错误是在连接 AccountDaoImpl.sessionFactory
时,因为 spring 找不到任何 org.hibernate.SessionFactory
bean。
关于java - 不能 Autowiring 接口(interface),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/30095067/