[FIXED] SOAP Proxy with Spring Integration

Issue

I'm trying to wrap my head around spring integration and would preferably like to stay away from XML-based configuration.

What I would like to do is the following:

1. Accept a SOAP request on a certain endpoint
2. Forward this request to a downstream SOAP service, without any modification (for now I just want the basics to work)
3. Return the result to the client

This seems like it should be pretty simple, but I don't have the faintest idea of where to start. Is this even possible with SI? As I understand it, and please correct me if I'm wrong, SI is mainly used for async data flows.

I did check out the integration sample repository, which includes example inbound WS requests, but these are all configured in XML, which, as I said, I'd preferably like to stay far away from.

Any pointers would be much appreciated; I've been reading through documentation for the past two days and I'm none the wiser!

Solution

If your application is just a proxy over other SOAP service, you should consider to use just plain HTTP Inbound Gateway and HTTP Outbound Gateway.

You receive an XML from client and send it into the downstream service. Receive from there an XML again and just push it back to the response for the client.

For this purpose I can suggest HTTP proxy solution via Java DSL:

    @Bean
    public IntegrationFlow httpProxyFlow() {
        return IntegrationFlows
                .from(Http.inboundGateway("/service"))
                .handle(Http.outboundGateway("/service/internal")
                                .expectedResponseType(String.class))
                .get();
    }

The problem with the SimpleWebServiceInboundGateway and SimpleWebServiceOutboundGateway pair that they extract a request and parse a respose to (un)wrap to/from the SOAP envelop. This looks like an overhead for your plain proxy use-case.

Answered By - Artem Bilan