We haven't used this solution on a large scale, because we do not have many users. Between 50 to 200 users currently use it in our organization.

This solution is easily scalable - we can easily scale the number of servers we can deploy the application on.

It's scalable, but it depends on how you deploy it. As long as you're not using monolithic applications, it's scalable.

I've never tried to scale the solution, so I can't speak to the solution's scalability.

This is not a highly-scalable solution.

We have ten users who use this solution. 

We only use a limited scope of Java. The development team primarily uses it.