First, do not cross-post the same question to different groups. Pick one and run with it, but don't spread it around unnecessarily.
Second, the wiki page you've referenced is for Liferay 4. Unless you are actually using Liferay 4, it does not apply in the current environment.
Third, you should never be modifying the Liferay code directly. Makes it impossible to upgrade later on. Pursue it as an EXT plugin or a simple extension class that you manage, but never modify the core code.
Fourth, you've probably got a messed up dev environment, probably due to just downloading stuff and trying to start things up and see what happens. Go to the documentation tab and follow the dev guide step by step to get your environment working...
