A falling blocks line making game.
You need to have a copy of Slick2D in order to run Tejris. Unfortunately, it's not available from Maven yet. You'll need to grab a copy of Slick2D and build it locally.
git clone git://github.com/nguillaumin/slick2d-maven.git
cd slick2d-maven
mvn clean install
Now that you have Slick2D in your local Maven repository you should be able to build Tejris just fine.