I used ActiveMQ in a previous project. 

We have been using ActiveMQ for quite a while.

I have been working with ActiveMQ for two years.

I have been using the solution for about four years now.

I have been using the tool for three years. 

I have been using the solution for a couple of years.

We are incorporating it into the application. ActiveMQ is one of the middleware applications we use.

We have been using ActiveMQ for approximately eight years now.

It is not the most recent. I believe we have taken one or two steps back.

We have been using this solution for three years.

I have been using ActiveMQ for 2 months.

We have been using the solution for the last six months.

I have been using the solution for a year.

I have had experience with ActiveMQ, on and off, for approximately five years.

I have been using the solution for 18 months.

I have used this solution during a summer internship last summer.

I have been using ActiveMQ for approximately two years.

I have been using ActiveMQ for one year.

I supported and used ActiveMQ from 2010-2016.

We have been using ActiveMQ for about 6 years.