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hrothwell avatar hrothwell commented on May 28, 2024

Default for singletons is lazy initialization - https://docs.micronaut.io/latest/guide/#builtInScopes

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transhkoot avatar transhkoot commented on May 28, 2024

Default for singletons is lazy initialization - https://docs.micronaut.io/latest/guide/#builtInScopes

If this is true @singleton = @lazy (Spring Boot) it means @context equivalent to @bean (Spring Boot) eager initialization.

is that true?
Also does @bean (Micronaut) give the same result as @bean (Spring Boot) ?

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transhkoot avatar transhkoot commented on May 28, 2024

Ok. I found some interesting info in the doc. we can change the @singleton behaviour
`public class Application {

public static void main(String[] args) {
    Micronaut.build(args)
        .eagerInitSingletons(true) (1)
        .mainClass(Application.class)
        .start();
}

}`

By setting this we use @singleton in Micronaut with exactly the same as @bean in spring boot
because in spring boot the default behaviour for @bean is singleton and eager initialization

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hrothwell avatar hrothwell commented on May 28, 2024

@Context will tie the life of that bean to the application context, ie if the context is created the bean will be created eagerly as well. You can get a similar effect from the builder args you also mentioned .eagerInitSingletons(true). One thing I am personally not 100% about though is if .eagerInitSingletons(true) also eager inits all singletons you might be pulling from libraries as well (or if that just happens anyways by default, this is something I actually need to look into at some point myself)

I'm not as familiar with Spring Boot, but I do believe @Bean is roughly the same between Micronaut and Spring Boot as you've sort of shown / pointed out

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