How can I upload a personalized .jar theme to Keycloak version 21 without restarting the server?

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You can upload a personalized .jar theme to Keycloak without restarting the server by following these steps:

1. Compile your theme as a .jar file. You can use Maven or Gradle to do this.

2. Navigate to the Keycloak admin console and select the Realm where you want to upload the theme.

3. Click on "Themes" in the left-hand menu and then click on "Install Theme".

4. Choose the .jar file that you compiled earlier and click on "Upload".

5. Keycloak will now install the theme and you should see it listed under "Installed Themes".

6. To activate the theme for a specific client, navigate to the "Clients" section in the admin console and select the client.

7. Click on the "Settings" tab and then select the new theme under "Login Theme" and "Account Theme".

8. Save your changes and the new theme will be applied to the selected client.