java - SpringMVC : @Transactional causes: No qualifying bean of type [. ..] 已定义

Question

我的主要功能类:

public class Database2Redis
{
    public static void test(ApplicationContext applicationContext)
    {
        BaseFckImpl service = applicationContext.getBean(BaseFckImpl.class);
        // ...
    }

    public static void main(String[] args) throws Exception
    {
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring-config.xml");

        test(applicationContext);
    }
}

我的 BaseFck 类(class):

@Service
public interface BaseFck
{
    @Transactional
    void test();
}

我的 BaseFckImpl 类:

@Service
public class BaseFckImpl implements BaseFck
{
    @Transactional
    public  void test()
    {
            Log.debug("------test---------");
    }
}

我的 spring-config.xml 的一部分

<?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:aop="http://www.springframework.org/schema/aop"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/mvc
    http://www.springframework.org/schema/mvc/spring-mvc-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/tx 
    http://www.springframework.org/schema/tx/spring-tx-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/aop 
    http://www.springframework.org/schema/aop/spring-aop-3.2.xsd">


    <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="locations">
            <list>
                <value>classpath:jdbc.properties</value>
                <value>classpath:config.properties</value>
            </list>
        </property>
    </bean>
    <util:properties id="systemConfigProperties" location="classpath:config.properties"/>


    <context:component-scan base-package="com.*" />
    <bean name="transactionManager"
        class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
    </bean>
    <tx:annotation-driven transaction-manager="transactionManager" />
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.**.mapper" />
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
    </bean>


    <mvc:annotation-driven />
    <mvc:default-servlet-handler />
    <context:component-scan base-package="xxxx" />
    <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />
    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />
</beans>

错误信息:

Exception in thread "main" org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.service.impl.BaseFckImpl] is defined
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:296)
    at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1127)
    at com.database2redis.Database2Redis.businessAccount2redis(Database2Redis.java:18)
    at com.Database2Redis.main(Database2Redis.java:29)

如果我删除@Transactional，那么它运行得很好。

为什么@Transactional 会导致此错误

有什么想法吗？

Answer 1

你需要

<tx:annotation-driven proxy-target-class="true"/> 

让 Spring 使用 CGLIB 类代理而不是默认的 JDK 接口(interface)代理。

我不知道为什么你有两个 <component-scan>您的配置中有一些元素，但您只需要一个。

它应该有一个 base-package代表要开始查找的基础包的值，即。包含您的 @Service 的那个类型。 component-scan假定为分层结构。给定一个像

这样的包结构

com
com/example
com/example/deep
com/example/another
com/final

扫描

<context:component-scan base-package="com.example" />

将扫描所有

com/example
com/example/deep
com/example/another

您尝试与 * 一起使用的符号

<context:component-scan base-package="com.*" />

不支持。