How to properly run a java application with Jetty and Mysql in docker?

Question

MySQL

There is a java web application that is packaged in a war file.
The application is launched via jetty. It also works with mysql database.
I need to build a container that would run my web application.
There are two ways:
1. Spool mysql and jetty docker image and run via docker-compose up.
2. Create your own image, which would install mysql, jetty inside itself and run the war file.
Question: which way is correct and why?

Answer 1

If possible, it is better to separate jetty and MySQL into different hosts/instances.
In general, it is not recommended to keep them in one image.
But it depends on the problem you are solving.

Answer 2

The question is why do you need it)
If you play locally in the "sandbox". Probably both options will work.
If you are going to "production", then you probably need to put the base nearby and it's better not to docker, it's not about that.