How can i receive the response from Apache camel route to the Spring boot controller - spring

Question

From the route I'm sending data to endpoint direct: receive and I'm receiving same in the controller, by using consumertemplate but getting below error
[Camel (camel-1) thread #1 -
JmsConsumer[MQT.EI.PRD2X4_PRODUCER_UT.REPLY.Q1]] ERROR
o.a.c.processor.DefaultErrorHandler.log - Failed delivery for
(MessageId: ID:c3e2d840d4d8e3f14040404040404040d85c2573b4cf7342 on
ExchangeId: ID-APINP-ELPT60235-1597255599355-0-5). Exhausted after
delivery attempt: 1 caught:
org.apache.camel.component.direct.DirectConsumerNotAvailableException:
No consumers available on endpoint: direct://recive.
Exchange[ID-APINP-ELPT60235-1597255599355-0-5]
Can anyone please give the suggestion on how can i get the response data from the route to the controller?
Controller code:
#Autowired
private CamelContext camelContext;
#Autowired
private ProducerTemplate producer;
#Autowired
ConsumerTemplate consumer;
#PostMapping("/request-reply")
public String requestReplyMapping(#RequestBody String inputReq) {
Exchange exchangeRequest = ExchangeBuilder.anExchange(camelContext).withBody(inputReq).build();
Exchange exchangeResponse = producer.send("direct:request-reply", exchangeRequest);
Exchange receive = consumer.receive("direct:receive"); //receiving data from this endpoint
return null;
}
Route Code:
#Component
public class RequestReplyRouter extends RouteBuilder {
#Override
public void configure() throws Exception {
from("direct:request-reply").
to("jms:RequestQueue?ReplyTo=ResponseQueue&exchangePattern=InOut")
.log("Request-reply Body is ${body} and header info is ${headers} ");
from("jms:ResponseQueue")
.log("Received Body is ${body} and header info is ${headers} ")
.to("direct:receive"); // sending data to the endpoint
}
}

Answer 1

You don't need a consumerTemplate for what you are attempting to do. Direct component by default has a exchange pattern of InOut. So you can use the exchangeResponse variable to get the exchange after your camel routes have been processed.
Camel route:
from("direct:start")
.log("${body} in stat")
.transform().simple("text")
.to("direct:nextRoute");
from("direct:nextRoute")
.log("${body} in nextRoute");
Rest Controller:
public class RestController{
final static String CAMEL_START_URI ="direct:start";
#Autowired
CamelContext camelContext;
#Autowired
#EndpointInject(uri=CAMEL_START_URI)
ProducerTemplate producer;
#PostMapping(value = "/request")
public String requestMapping(#RequestBody String inputReq) {
Exchange sendExchange = ExchangeBuilder.anExchange(camelContext).withBody(inputReq).build();
Exchange outExchange = producer.send(sendExchange);
String outString = outExchange.getMessage().getBody(String.class);
System.out.println(outString); //this will have a value of "text" since I am setting the body as "text" in the second route
return outString;
}
}