Graceful shutdown with spring

[ESAStackAdmin]

Expected behavior

Restlight should be shut down before closing Spring context.

Actual behavior

Restlight does the graceful shutdown by adding an individual shutdown hook, which has a different lifecycle from Spring's shutdown hook. This would cause errors when invoking the controller methods because the beans these methods belong to would have been destroyed in Spring's shutdown hook if Spring's shutdown hook is executed before Restlight's shutdown hook.

esa-restlight/restlight-server/src/main/java/esa/restlight/server/bootstrap/NettyRestlightServer.java

Line 112 in ce8fe48

Runtime.getRuntime().addShutdownHook(new Thread(this::shutdown, "shutdown-hook-thread"));

Maybe we should bind the shutdown hook lifecycle with Spring context(if it is in Spring env).

Steps to reproduce

see above

Env

• Restlight version: 0.1.0