Hi, I remember watching some video where speaker w...

# spring

[Czar]

Hi, I remember watching some video where speaker was talking about changes in Spring 5.Some.Version. There was something about difference between

@Configuration class MyConf(private val someBean: SomeBean) {
    @Bean fun myBean(): MyBean { /* do something with someBean */ }
}

and

@Configuration class MyConf {
    @Bean fun myBean(someBean: SomeBean): MyBean { /* do something with someBean */ }
}

But I don't remember either which video it was or what was the difference. Googling around didn't yield any results yet.
Does anyone remember/know what I'm talking about?

[Czar]

Ok, I don't remember the video still, but I've found what it was related to, I'm not sure what changed in Spring 5 or in which specific version or if it was only recommendation change, but it involved setting proxyBeanMethods to false to improve performance here and there.
So my examples are not really relevant.

[Czar]

And found the change too 🙂 https://github.com/spring-projects/spring-framework/blob/master/spring-context/src/main/java/org/springframework/context/annotation/Configuration.java#L461

[Czar]

so, given the above, what's preferable?

@Configuration(proxyBeanMethods=false)
class MyConfiguration {
    @Bean fun myBean(): MyBean {/*...*/}
}

vs

@Component
class MyConfiguration {
    @Bean fun myBean(): MyBean {/*...*/}
}

[corneil]

In first case someBean is injected into the constructor of MyConf while in second case into method call as argument for myBean
In general it should not make much of a difference.

[corneil]

Unless for some reason the proxy generation doesn't like that.

[Czar]

@corneil Yeah, that concerns my first example, which as I have iterated is not really relevant. The question is what's better to use in the second example. From reading the docs, effectively they are the same: with proxyBeanMethods=false all @Configuration→@Bean are lite `@Bean`s as if they were declared in a @Component, but maybe I'm missing something.

[corneil]

The question would be. What do you want to achieve?