CODEWITHSUNDEEP
spring-integration
Kris Swat
Kris Swat

Reputation: 1006

Spring Integration error channel in gateways

I have a rest controller that will trigger my gateway method

<int:gateway id="bGatewayService"
        service-interface="nd.l.eai.gw.BGateway"
        default-reply-channel="dest-channel"
        default-request-timeout="5000" default-reply-timeout="5000">        
        <int:method name="m1" request-channel="atbInChannel"/>
        <int:method name="m2" request-channel="btuInChannel"/>
    </int:gateway>

the application works ok. I don't have error-channel [as you see above]

My question is - what is the advantage of the error-channel, as I am getting the 500 or Bad Request without it. Should I create an error channel and include in the above?

Also I am using default reply channel, is that ok? or should I add reply-channel to each method? I have another gateway that has 10 methods.

Upvotes: 0

Views: 382

Answers (2)

Artem Bilan
Artem Bilan

Reputation: 121272

You don't need error-channel if you are not going to have some compensation flow. If just throw an exception as is OK with your use-case, then don't configure any error-channel.

In most cases we don't need a reply-channel as well, even that default-reply-channel. When you don't use an output-channel in the last endpoint of your flow, the replyChannel header is going to be use. We only need that reply-channel for use-cases where we need some kind of pub-sub reply message processing, where we would like to send a reply message not only as a return for gateway method call, but also to some other flow.

More info is in the Docs: https://docs.spring.io/spring-integration/docs/current/reference/html/#gateway

Upvotes: 1

Gary Russell
Gary Russell

Reputation: 174554

It depends on what you want to do; the error channel allows you to analyze the error and return different results based on the exception.

E.g. you can ask them to try again for a transient error or report the problem for a fatal error in the request.

The reply channel is generally not needed unless you want to do something like add a wire tap to log the reply. In fact, that channel ends up being bridged to the replyChannel header in the request (which is how the gateway correlates requests/replies.

Upvotes: 1

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