Vertx verticles on AWS Elastic beanstalk

I created Vertx application which contains 2 verticles. 1 is running on port 8888 and the other is running on 8881.

I am trying to deploy the application on Elastic beanstalk. But I'm getting error 502 Bad Gateway.

Here's the config file nginx place at .ebextensions/nginx/nginx.conf

user                    nginx;
error_log               /var/log/nginx/error.log warn;
pid                     /var/run/nginx.pid;
worker_processes        auto;
worker_rlimit_nofile    33282;

events {
    worker_connections  1024;
}

http {
  include       /etc/nginx/mime.types;
  default_type  application/octet-stream;

  log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                    '$status $body_bytes_sent "$http_referer" '
                    '"$http_user_agent" "$http_x_forwarded_for"';

  include       conf.d/*.conf;

  map $http_upgrade $connection_upgrade {
      default     "upgrade";
  }

  server {
      listen        5000;
      root /var/app/current/public;

      location / {
      }

      location /api {
          proxy_pass          http://127.0.0.1:8888;
          proxy_http_version  1.1;

          proxy_set_header    Connection          $connection_upgrade;
          proxy_set_header    Upgrade             $http_upgrade;
          proxy_set_header    Host                $host;
          proxy_set_header    X-Real-IP           $remote_addr;
          proxy_set_header    X-Forwarded-For     $proxy_add_x_forwarded_for;
      }

      location /api2 {
          proxy_pass          http://127.0.0.1:8881;
          proxy_http_version  1.1;

          proxy_set_header    Connection          $connection_upgrade;
          proxy_set_header    Upgrade             $http_upgrade;
          proxy_set_header    Host                $host;
          proxy_set_header    X-Real-IP           $remote_addr;
          proxy_set_header    X-Forwarded-For     $proxy_add_x_forwarded_for;
      }

      access_log    /var/log/nginx/access.log main;

      client_header_timeout 60;
      client_body_timeout   60;
      keepalive_timeout     60;
      gzip                  off;
      gzip_comp_level       4;

      # Include the Elastic Beanstalk generated locations
      include conf.d/elasticbeanstalk/01_static.conf;
      include conf.d/elasticbeanstalk/healthd.conf;
  }
}

Here's the CodeBuild buildspec.yml file:

version: 0.2

phases:
  install:
    runtime-versions:
      java: corretto11
  build:
    commands:
      - echo Build started on 'date'
      - gradle bootJar
  post_build:
    commands:
      - echo Build completed on 'date'
      - ls build/libs
      - mv build/libs/*.jar app.jar
      - ls
artifacts:
  files:
    - app.jar
    - .ebextensions/**/*

I have installed nginx on my local machine and with the above configuration it is working fine.

Did I miss something?