spring依赖注入单元测试：expected single matching bean but found 2

异常信息：org.springframework.beans.factory.UnsatisfiedDependencyException:

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No unique bean of type [com.byd.mes.bussiness.service.siteoperation.activity.ExecuteActivityService] is defined: expected single matching bean but found 2: [executeActivityService, executeActivityForTesterService]

解决方案：

博文链接地址：​​http://haowei0315.javaeye.com/blog/444731​​

@Qualifier 
@Autowired是根据类型进行自动装配的。在上面的例子中，如果当Spring上下文中存在不止一个UserDao类型的bean时，就会抛出BeanCreationException异常；如果Spring上下文中不存在UserDao类型的bean，也会抛出BeanCreationException异常。我们可以使用@Qualifier配合@Autowired来解决这些问题。 
1. 可能存在多个UserDao实例

1. @Autowired  
2. public void setUserDao(@Qualifier("userDao") UserDao userDao) {  
3. this.userDao = userDao;  
4. }

这样，Spring会找到id为userDao的bean进行装配。 
2. 可能不存在UserDao实例

1. @Autowired(required = false)  
2. public void setUserDao(UserDao userDao) {  
3. this.userDao = userDao;  
4. }  


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