how to close the application during startup in spring boot

Question

I have a question regarding the startup in spring boot, how to close the application during the startup time, for example, I have the following

application.yml:

ansi: true

And I have the following @Configuration class:

@Configuration class AppConfig { @Value('${ansi}') String ansi; @Bean getAnsi() { if(ansi.equals("true")) { Ansi ansiObj = new Ansi(); ansiObj.ansi = ansi; return ansiObj; } } } class Ansi { String ansi; }

When ansi in the application.yml is true, it continue, otherwise, the application should be closed, can we close the application during the bean creation? is it a good practice? Are there any good ways to handle this?

You may want to check this: stackoverflow.com/questions/22944144/… — Tu.Ma.
– Tu.Ma., Commented Nov 8, 2018 at 10:06

Kamil W · Accepted Answer · 2018-11-08 10:11:04Z

We have a lot of options to shutdown spring-boot application:

Shutdown rest endpoint - add below properites to your application.properties and fire following request curl -X POST localhost:port/actuator/shutdown

management.endpoints.web.exposure.include=* management.endpoint.shutdown.enabled=true endpoints.shutdown.enabled=true

Also you can call suitable method to shutdown application:

By calling method close() on ConfigurableApplicationContext object (it will close application context)
By passing exit code to method SpringApplication.exit(ctx, () -> 0);

Please check this article for more details.

Michael · Accepted Answer · 2018-11-08 10:05:16Z

If a bean throws an exception then Spring will not proceed and the process will end.

if(ansi.equals("true")) { Ansi ansiObj = new Ansi(); ansiObj.ansi = ansi; return ansiObj; } else { throw new IllegalArgumentException("reason"); }

I can't say that I've ever had a use-case for it, but I wouldn't say it's necessary bad practice. In this limited example of true and false, it seems a bit unusual. It would make more sense if you needed a constraint on a property e.g. X < 10

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