I don't normally use eclipse, but I wanted to use it to debug my code. I have an existing program that runs fine from the commandline but when I try to run it from eclipse it all I get is errors about how it can't find the class. I tried different workspaces and different project folders but it just won't work. What I normally do from the commandline is to navigate to the 'projects' folder then type java stuff.collision.CollisionTest to run it. The CollisionTest.class file is in the 'collision' folder in the 'stuff' folder in the 'projects' folder and CollisionTest.java is in the 'stuff.collision' package. I tried setting to workspace to 'projects', the folder containing 'projects' and 'stuff' and creating a new project from 'projects', 'stuff' and 'collision' in various combinations. When I try to run it, I get a menu about run configuration, after slecting java application, I tried to put 'CollisionTest' and 'stuff.collision.CollisionTest' as the main class but neither worked. How can I get this to work?