Error building sqlsession problem

1、mybatis The core file is not configured properly

Even mapper Whether the position of the is well placed will also lead to
So pay attention to whether the core file is correct when configuring yourself

2、 The returned result type is not configured

When setting the permission to return the result, you should select the location of the package , If the alias of the class is configured , You can also use the alias of the class . This can reduce the amount of code redundancy

3、 Spelling mistakes
Accidentally modified the original in the core file name attribute , The scalar cannot be resolved

A lot of times . We all accidentally click on the logo inside him , When the configuration appears , The core file cannot read the planned logo

This kind of problem , Most of them are caused by their own carelessness , Just pay more attention

list<map<String,integer>> error

"msg": "Could not write JSON: java.lang.Long cannot be cast to java.lang.Integer; nested exception is com.fasterxml.jackson.databind.JsonMappingException: java.lang.Long cannot be cast to java.lang.Integer (through reference chain: java.util.ArrayList[0]->java.util.HashMap[\"afZrs\"])",
"code": 500

}

hold integer Change to object Have a try
principle ：

nested exception is org.apache.ibatis.binding.BindingException

To do this, add data for use