After IDEA changed the classes, it was found that jrebel started to deploy after a long time, 1 minute or 2 minutes. I checked online and found that after IDEA loses focus, IDEA will automatically save, compile, and hot-replace jrebel automatically. On frame deactivation: Automatically compile when you lose focus. For example: after modifying a file, you directly switch to the browser, or click something else. As long as the current intellij idea is not in focus, the automatic compile and update file action is activated. In other words, you don't have to manually press ctrl+F9.
