The program package does not exist in the IDE. For example: the program package com.ldh.domain does not exist and the symbol cannot be found.

When we import other people's projects when using IDE, there will often be problems that the package does not exist, such as:

You can set it as follows:

Here is the Chinese version, the English version is available:

File—>Setting—>Build,Execution,Deployment—>Maven—>Importing

Set like this