tomcat 报错 Status 500 - Mapper method ‘xxxxx‘ has an unsupported return type: class xxx

myBatis 接口写了 insert ，对应的dao层里写的返回值是一个实体类
User add(User user);

报错 Status 500 - Mapper method ‘xxxxx’ has an unsupported return type: class xxx

解决：mapper文件中update、delete、insert 语句不需要设置返回类型，默认返回一个int所以把返回值类型改成 int
int add(User user);

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tomcat 报错 Status 500 - Mapper method ‘xxxxx‘ has an unsupported return type: class xxx

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