Spring Boot Camel Route - get data from rest endpoint - spring

Question

I want to create camel route in Spring Boot (2.1.1) project to get the data from some (rest) endpoint (http://localhost:8080/getAllUsers) and to send that data to activeMq.
I have tried with timer data to send it on activeMq and to consume it and it is working. But I have problem with collecting data from endpoint.
I have tried several things but no success. This is what I have tried.
In this example I am not sending the data to ActiveMq, I just want to see the response...
public void createNewRoute() {
CamelContext context = new DefaultCamelContext();
try {
ProducerTemplate template = context.createProducerTemplate();
context.start();
Exchange exchange = template.request("http://localhost:8080/getAllUsers",
new Processor() {
public void process(Exchange exchange) throws Exception {
}
});
if (null != exchange) {
Message out = exchange.getOut();
int responseCode = out.getHeader(Exchange.HTTP_RESPONSE_CODE, Integer.class);
System.out.println("Response: " + String.valueOf(responseCode));
}
Thread.sleep(1000 * 3);
context.stop();
} catch (Exception ex) {
System.out.println("Exception: " + ex);
}
System.out.println("DONE!!");
}
Another route:
from("servlet://localhost:8080/getAllUsers").to("activemq://all-users");
And another:
rest("//localhost:8080/getAllUsers")
.get().consumes("application/json")
.to("activemq://all-users");

Answer 1

I will go with your second example:
from("timer://test?repeatCount=1").routeId("newRoute")
.streamCaching()
.process(exchange -> exchange.getIn()
.setBody(exchange.getIn()
.getBody()))
.marshal()
.json(JsonLibrary.Jackson)
.setHeader(Exchange.HTTP_METHOD, constant("GET"))
.setHeader(Exchange.CONTENT_TYPE, constant("application/json"))
.to("http://localhost:8080/getAllUsers")
.log(LoggingLevel.INFO, "This is my body: ${body}")
.to("activemq:queue://new-queue");
This will trigger it once.

Answer 2

Try this without context.start() ....
CamelContext camelContext = new DefaultCamelContext();
ProducerTemplate template = camelContext.createProducerTemplate();
Exchange exchange = template.send("http://localhost:8080/getAllUsers", new Processor() {
public void process(Exchange exchange) throws Exception {}
});
Message out = exchange.getOut();

Answer 3

The http components are streaming based, so you can ask Camel to give you the response as string instead.
String s = exchange.getMessage().getBody(String.class);
See more in these links
http://camel.apache.org/stream-caching
http://camel.apache.org/why-is-my-message-body-empty.html