I would like it to have no warnings in my eclipse projects, but I get this one warning:
Classpath entry org.eclipse.jdt.USER_LIBRARY/Liferay 6.1 GA Plugin AP
Remove it here: Preferences -> Validation -> Classpath Dependency Validator
Also check if your specific project has its own validation settings overwritting the global ones. Project -> Properties -> Validation
Select the warning, press Ctrl+1 (Quick Fix), chose the option "Exclude the associated raw classpath entry from ..."