Mybatis：Mapper method attempted to return null from a method
关键词
SpringMVC SSM Mybatis eclipsesegmentfault
报错内容
Mybatis：Mapper method attempted to return null from a method with a primitive return type (int)
缘由
Mapper.xml的标签用错了。。。（低级错误，轻喷。。。）
好比原本应该：
插入语句用<insert></insert>，更新语句用<update></update>，删除语句用<delete></delete>app
结果全用成<select></select>eclipse
解决
用回对应的标签就行。url
参考
Mybatis：Mapper method attempted to return null from a method with a primitive return type (int).net
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