Mapper method 'com.***.delByNumber' has an unsupported return type: class java.lang.String
问题情况，如图： 错误内容详情，如图： 解决办法： 1、把Controller层 改为这样： 2、把Service层 改为这样： 3、把Mapper层 改为这样： 4、最后把Mapper.xml 改为这样： 问题就解决了
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相关文章
- 1. Mapper method 'org.xxxxmapper.XXXXXMapper.saveXXXX' has an unsupported return type:
- 2. 控制台出现“The script has an unsupported MIME type ('text/html')”报错
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- 4. MyBatis Error：BindingException Mapper method attempted to return null
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- 6. [mybatis]............attempted to return null from a method with a primitive return type (int).
- 7. org.springframework.web.HttpMediaTypeNotSupportedException: Unsupported Media Type, status=415
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