There are two ways to accomplish this, either reconfigure Glassfish to listen on port 80 or install an nginx reverse proxy in front of it.

Option 1

To have Glassfish listen on port 80:

1) Connect to the administration interface (by default on port :4848)

2) In the left menu go to Configurations

3) Then select the appropriate configuration you need to change eg server-config

4) Then go to Network Config

5) Then go to Network Listeners

6) Select the appropriate listener, probably http-listener-1

7) Change the Port value to 80

8) Save and reboot your glassfish server/instance/cluster according to your needs

Option #2

To configure an nginx reverse proxy, first install nginx. On Ubuntu this can be done with sudo apt-get install nginx. Once installed, open the file /etc/nginx/sites-enabled/default and modify it so it reads:

server {

        listen 80 default_server;
        listen [::]:80 default_server;

        server_name _;

        location / {
        proxy_pass http://localhost:8080/project/;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
    }

}

Then restart nginx for the changes to take effect:

sudo service nginx restart

You need a Reverse Proxy. As you use Nginx (assuming from tag), it’s very simple.

Open your default server block (or any you want to use):

sudo nano /etc/nginx/sites-available/default

Find `location / block and delete any content from it. Make sure it looks like this:

...
location / {
proxy_pass http://localhost:8080/project/;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
}
...

Save file, exit editor and restart nginx:

sudo systemctl nginx restart

You should get desired results.
To learn more about it, you can refer to this tutorial which covers both Nginx and Apache. I personally recommend Nginx as it better suit reverse proxy needs.

Great!! Nginx was installed already. Now, you could tell me how would the /etc/nginx/sites-enabled/default file for the case of using 2 or more projects in different urls?

Example

159.203.100 … :8080/ Project1 to www.project1.com
159.203.100 … :8080/ Project2 to www.project2.com

Thank you very much!!!

It worked perfect. The only detail left is:

example.com works
www.example.com not work

I need some configuration to accept the www?

Thanks again!

Yes, i use digital ocean. Try it. Thanks

Good morning, yesterday configure from digital ocean and nginx as they left me in the last comment, but until now I do not work the url with the www.
Am I missing something else?

I send you my settings.

In nginx in the example.com file

server {
         Listen 80;
         Listen [::]: 80;

         Server_name example.com www.example.com;

         Location / {
         Proxy_pass http: // ipServer: 8080 / Example /;
         Proxy_set_header Host $ host;
         Proxy_set_header X-Real-IP $ remote_addr;
         Proxy_set_header X-Forwarded-For $ proxy_add_x_forwarded_for;
         Proxy_set_header X-Forwarded-Proto $ scheme;
         }
}

**
In digital ocean **

*A
@ –> ipServer

CNAME
www –> @*