How to create simple xml and test for parallel testing using junit?

I am using JUnit as a framework and I am trying to set parallel testing, everywhere I lookedonline I can only find examples for TestNG. I have the Grid up and running and I can test cross platform and cross browser but I need to wait for each test to finish in order for the next to start? I just need a basic example to get me started which I think will be of great help to others like me using JUnit.