Spring Boot Application deployed on Elastic Beanstalk Java environment returns 502

Question

I'm trying to deploy a very simple Spring Boot application on AWS Elastic Beanstalk using AWS's Java configuration (not their Tomcat configuration), but I keep getting a 502 error with the following log:

2016/06/10 02:00:14 [error] 4921#0: *1 connect() failed 
(111: Connection refused) while connecting to upstream, client: 38.94.153.178,   
server: , request: "GET /test HTTP/1.1", upstream:   "http://127.0.0.1:5000/test",
host: "my-single-instance-java-app.us-east-1.elasticbeanstalk.com"

I've tried setting my port via Spring's application.properties to what the log seems to want (5000, using server.port=5000) and have verified that my application runs successfully on that port on localhost.

This question is very similar, except that I'm deploying a JAR instead of a WAR. It seems like there is something I'm missing regarding configuring Nginx, and I don't know how to proceed.

Here's my Spring Application:

@SpringBootApplication
public class MyApplication {

    public static void main(String[] args) {
        SpringApplication.run(MyApplication.class, args);
    }

    @RestController
    public static class MainController {

        @RequestMapping("/test")
        public String testMethod() {
            return "Method success!";
        }
    }
}

Answer 1

Nginx doesn't know on which port your spring boot applicaiton is running. Make application run on port 5000 that Nginx redirects to by default by adding "server.port=5000" to application.properties or other suggested ways in the last step:

https://pragmaticintegrator.wordpress.com/2016/07/12/run-your-spring-boot-application-on-aws-using-elastic-beanstalk/