MyBatis Result Map Configuration Error: 'stuMap' Not Found

It seems that there is an issue with the result map configuration in the ClassMapper interface. The error message indicates that the result maps collection does not contain a value for the 'stuMap' result map.

To fix this issue, you should check the ClassMapper interface and make sure that the 'stuMap' result map is correctly defined. The result map should be declared with the @ResultMap annotation and referenced correctly in the SQL query or mapper method.

Here is an example of how the result map declaration should look like in the ClassMapper interface:

@Results(id = "stuMap", value = {
    @Result(property = "id", column = "id"),
    @Result(property = "name", column = "name"),
    // Other property mappings...
})

Make sure to replace the 'id', 'name', and other property/column names with the actual names used in your database table and entity class.

If the result map is already defined correctly, then you should check if the ClassMapper interface is properly referenced in your configuration files (such as the MyBatis XML mapper file or the MyBatis configuration file).

Once you have made the necessary changes, restart your application and try again. The error should be resolved, and the request processing should be successful.