setting SystemPropertyVariable for gatling

How do I pass a SystemPropertyVariable to my scala class? this is required by the java method which is called inside my simulation class in gatling.

My pom:

io.gatling gatling-maven-plugin 2.2.4 ${server.port} ${admin.port} performanceTests integration-test integration-test src/test/resources/data target/gatling src/test/resources/bodies src/test/scala gatlingTests.BasicSimulation

Please help!

Thanks,
Sanhita