Installation

1. Access Settings (Preferences on Mac OS). Select Plugins.
2. Press Browse Repositories.
3. Find JRebel. Press Install plugin.

Activation

1. Open Help > JRebel > Activation.
2. Fill out the form.
3. Press Activate JRebel.

Startup configuration

1. Press the jrebel-ide-icon Run with JRebel button on the toolbar to run your application with JRebel enabled.

Project configuration

1. Open View > Tool Windows > JRebel panel. The JRebel Modules window opens.
2. Enable JRebel for the desired modules by selecting the column checkboxes.
3. Redeploy your application!

Reload your code

1. Restart your Java application using jrebel-ide-icon

   Run with JRebel.

2. Change something in the application code.
3. Use Build > Make Project command to compile classes and update your application.
4. Refresh the application in the browser to see the changes!

摘自：
https://zeroturnaround.com/software/jrebel/quickstart/intellij/?run=ide#!/reload
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