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
- @Autowired
- public void setUserDao(@Qualifier("userDao") UserDao userDao) {
- this.userDao = userDao;
- }
这样，Spring会找到id为userDao的bean进行装配。
2. 可能不存在UserDao实例
- @Autowired(required = false)
- public void setUserDao(UserDao userDao) {
- this.userDao = userDao;
- }
http://blog.csdn.net/hjjzhangkui/article/details/6052329
