Live Reload
JRebel is a commercial developer productivity tool for automatic, real-time update of Java code in the running application. Vaadin detects the JRebel Agent and automatically reloads the application in the browser after the Java changes have been hotpatched.
Step-by-Step Guide
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Set up and activate JRebel in your IDE by following the Quick Start guides available at https://www.jrebel.com/products/jrebel/learn. Use at least the
2020.2.1version, which contains built-in live reload integration. -
Run or debug your Vaadin application using the JRebel Agent.
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Navigate to your Vaadin application on the browser, make and save some changes, and the browser reloads automatically.
Additional Configuration
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When using the Jetty Maven plugin together with JRebel, ensure that automatic restart is disabled (omit or set
<scanIntervalSeconds>to a value of0or less).
Current Limitations
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Since the server doesn’t restart, modifications to startup listeners and code that connects front-end and back-end components, such as adding a new
LitTemplateclass, aren’t reflected. However, modifications to routes are picked up. -
With
@PreserveOnRefresh, view instances are reused when reloaded in the browser; hence, hotpatched changes to the view constructor aren’t reflected until the view is opened in another browser window or tab.
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