before IDEA was updated, it was obviously adjusted not to delete the setting, but I don"t know why the setting was restored. This is not the point. Today, the updated Javaweb project entered the project as it was after IDEA modified the code to open tomcat. I went to the webapp directory of tomcat to see that the project was still the same, and it was deleted cheaply. And the target directory is also (blaming me for being cheap) now the project is opened with 404 help. I just learned javaweb and don"t know much about it