SSM项目No qualifying bean of type 问题常见解决方法

错误信息如下

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'cn.resume.service.impl.UserServiceImpl' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@javax.annotation.Resource(shareable=true, lookup=, name=, description=, authenticationType=CONTAINER, type=class java.lang.Object, mappedName=)}

常见解决方法:

1. 检查spring核心配置文件是否扫描了当前类所在的包
2. 当前类是否有 @Service @Component等注解,当前类是否被@Bean初始化
3. ssm项目检查是否web.xml配置文件是否有关联spring核心配置文件
   解决方法:在web.xml中添加监听器并且声明应用范围(整个WEB项目)内的上下文初始化参数。代码如下

    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>