Spring Integration http outbound gateway POST restful call with JSON

Question

I tried to make a POST restful api call from Spring Integration with http:outbound-gateway. But I couldn't figure out how to pass the request JSON object to the restful API. Can someone show me how to do it? Thanks !

Here is my spring-integration-config.xml

<si:channel id="request.channel" />

<si:channel id="response.channel">
    <si:queue capacity="10" />
</si:channel>

<int-http:outbound-gateway id="employeeinfoGateway"
    request-channel="request.channel" 
    url="http://localhost:8080/EmployeeInfo"
    http-method="POST" 
    expected-response-type="java.lang.String" 
    charset="UTF-8"
    reply-timeout="5000" 
    reply-channel="response.channel">
</int-http:outbound-gateway>

Here is my Java code:

MessageChannel request = (MessageChannel) context.getBean("request.channel");       

    JSONObject obj = new JSONObject();
    obj.put("empId", "100");

    request.send(MessageBuilder.withPayload(obj).setHeader("content-type","application/json").build());

Here is the error message I received:

Could not write request: no suitable HttpMessageConverter found for request type [org.json.JSONObject] and content type [application/json], failedMessage=GenericMessage [payload={"empId":"100"}, headers={content-type=application/json, id=a0aba65f-3f49-4dfc-2431-51983666772b, timestamp=1521419315405}]

Artem Bilan Artem Bilan · Accepted Answer · 2018-03-19T13:14:52

Not sure what is that JSONObject. Seems for me that's not how Jackson JSON processor works, but I would suggest to try to send just a plain java.util.Map instead.

There is a MappingJackson2HttpMessageConverter in the RestTemplate underneath to convert incoming payloads to a JSON representation.

Maybe you just don't have a com.fasterxml.jackson.core:jackson-databind jar in your classpath?

Spring Integration http outbound gateway POST restful call with JSON

1 Answers