Amazon Elastic Beanstalk with SSL (HTTPS) without a Load Balancer on Single Instanced EC2 Amazon Linux 2 Image (Java)

.ebextensions\https-instance-securitygroup.config

######
## See https://github.com/awsdocs/elastic-beanstalk-samples/tree/main/configuration-files/aws-provided/security-configuration for refrence.
# .ebextensions/https-instance-securitygroup.config
Resources:
  sslSecurityGroupIngress:
    Type: AWS::EC2::SecurityGroupIngress
    Properties:
      GroupId: {"Fn::GetAtt" : ["AWSEBSecurityGroup", "GroupId"]}
      IpProtocol: tcp
      ToPort: 443
      FromPort: 443
      CidrIp: 0.0.0.0/0
      
# Optional, for SSH
  sshSecurityGroupIngress:
    Type: AWS::EC2::SecurityGroupIngress
    Properties:
      GroupId: {"Fn::GetAtt": ["AWSEBSecurityGroup", "GroupId"]}
      IpProtocol: tcp
      ToPort: 22
      FromPort: 22
      CidrIp: 0.0.0.0/0

.ebextensions\https-instance.config

######
## See https://github.com/awsdocs/elastic-beanstalk-samples/tree/main/configuration-files/aws-provided/security-configuration 
# for refrence.
# .ebextensions/https-instance.config
files:
  /etc/pki/tls/certs/server.crt:
    mode: "000400"
    owner: root
    group: root
    content: |
      -----BEGIN CERTIFICATE-----
      **Paste  your certificate here**
      -----END CERTIFICATE-----
      -----BEGIN CERTIFICATE-----
      **If chained cirtificate, paste your chain here**
      -----END CERTIFICATE-----

  /etc/pki/tls/certs/server.key:
    mode: "000400"
    owner: root
    group: root
    content: |
      -----BEGIN PRIVATE KEY-----
      **Paste your key here**
      -----END PRIVATE KEY-----


container_commands:
  01restart_nginx:
    command: "service nginx restart"

.platform\hooks\postdeploy\script.sh

#!/bin/bash
# .platform/hooks/postdeploy/script.sh
echo 'server {
              listen       443;
              server_name  localhost;
              ssl                  on;
              ssl_certificate      /etc/pki/tls/certs/server.crt;
              ssl_certificate_key  /etc/pki/tls/certs/server.key;

              ssl_session_timeout  5m;

              ssl_protocols  TLSv1 TLSv1.1 TLSv1.2;
              ssl_ciphers "EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH";
              ssl_prefer_server_ciphers   on;
              location / {
              proxy_pass          http://localhost:5000;
              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-Forwarded-SSL     on;
              proxy_set_header    X-Real-IP           $remote_addr;
              proxy_set_header    X-Forwarded-For     $proxy_add_x_forwarded_for;
              }
            }' > '/etc/nginx/conf.d/https.conf'
echo 'location / {
            return 301 https://$host$request_uri;
          }' > '/etc/nginx/conf.d/elasticbeanstalk/00_application.conf'
service nginx restart

Buildfile

build: mvn clean help:active-profiles package -Pprod
# I am using spring-boot project but you might need to change the build commant required to make the fat jar.

etc\nginx\nginx.conf

#Elastic Beanstalk Nginx Configuration File
######### This is a sample /etc/nginx/nginx.conf file. 
###### Only for refrence. 
#### This file is supposed to be already present as it is in the EC2 instance to make the get the desired outcome (https).
usernginx;
error_log/var/log/nginx/error.log warn;
pid/var/run/nginx.pid;
worker_processesauto;
worker_rlimit_nofile    32137;

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"';
  ########
  ### Here our generated https.conf will be included
  include conf.d/*.conf;

  map $http_upgrade $connection_upgrade {
      default     "upgrade";
  }
  server {
    listen80 default_server;
    access_log    /var/log/nginx/access.log main;

    client_header_timeout 60;
    client_body_timeout   60;
    keepalive_timeout     60;
    gzipoff;
    gzip_comp_level4;
    gzip_types text/plain text/css application/json application/javascript application/x-javascript text/xml application/
    xml application/xml+rss text/javascript;

    # Include the Elastic Beanstalk generated locations
    #########
    ### The above script.sh will replce the generated 00_application.conf and included here.
    include conf.d/elasticbeanstalk/*.conf;
  }
}

Procfile

web: java -jar target/demo-0.0.1-SNAPSHOT.jar
# You can costomize this line to anything that runs your application e.g. include env variables or you have mutiple jars to run from.

It would be helpful if you add a sample pom.xml that will include the directories/files in the proper location of a Fat jar?

1. While using .ebextensions and .platform hooks you don't make a fat jar by yourself as Elastic Beanstalk does it for you so you only put the relevant files with the source code in a zip file and deploy it to the application (I myself haven't tried the other way of deploying the app using a fat jar though so I am not sure if that would work). Now for Elastic Beanstalk to understand how to build the fat jar out of your source code and how to run the app you need to put two more files inside the zip, Buildfile and Procfile respectively (which I will add next thanks to you for letting me know).
2. Surely I can also include a pom.xml but that would be like any other pom.xml as Elastic Beanstalk doesn't require any additional dependency.

More on it here.