错误原因：Mapper对应的XXXMapper.xml中的<select>标签的resultType和resultMap搞混了，resultType需要对应一个类，而resultMap对应<resultMap>标签中定义的映射。关于两者的区别可见：http://blog.csdn.net/woshixuye/article/details/27521071
Spring MVC项目出现的错误:Result Maps collection already contains value for ...
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