Spring / Spring Boot
How does the Devtool provided Auto-restart works in Spring Boot?
The Spring Boot restart technology works by using 2 classloaders.
Class that don't change ( 3rd party jars, as an example) are loaded into base classloader. Classes that actively change during development are loaded into restart classloader.
When the application restarts, the restart classloader is destroyed and new one is created. This makes the application restarts faster than "cold restart" as the base loader is already available.
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