mybatis返回int类型报错 return null from a method with a primitive return type (int).
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SSM 框架，当mybatis返回int类型时，报一下错误：
代码如下：
会报错如下：
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.apache.ibatis.binding.BindingException: Mapper method 'com.jeeplus.modules..res.dao.UserDao.getWeekClass attempted to return null from a method with a primitive return type (int).
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.Java:894)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)
javax.servlet.http.HttpServlet.service(HttpServlet.java:734)
javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
解决方案，返回类型设置为封装类型Integer而不是基本类型int
service层如果需要int数据类型，可以自动从Integer进行转换， 当然有可能加入一些判断，比如Integer为Null，赋给int可以先转成0
修改service层，代码如下：
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