@EnableIntegration annotation purpose

Question

I migrate project from XML Spring Integration configuration to Java DSL. I prepared some integration tests beforehand. So I can do the migration safely step-by-step.

At some point after moving this XML connector definition

<int:publish-subscribe-channel id="upstreamAckChannel" />

to Java Spring Configuration

@Bean
public PublishSubscribeChannel upstreamAckChannel() {
    return MessageChannels.publishSubscribe().get();
}

my integration flow stopped resend test messages to my tests.

After some time and experiments I realized that my Spring Java configuration must have @EnableIntegration annotation together with usual Spring @Configuration annotation for properly work.

The question is what is @EnableIntegration annotation semantic? When I can not use it and when I must use?

I could find only this small Configuration paragraph in official reference manual. Unfortunately, description isn't clear.

Answer 1

The PublishSubscribeChannel class exists inside of the Spring Integration project. The @EnableIntegration annotation is used to adopt a default configuration for Spring Integration, so typically when using Spring Integration you'll want to add it (unless you're using a piece of Spring Integration that doesn't require a context--unlikely). The only time you might want to forego it is if you want to do your own configuration from scratch.