java - eclipse errors when calling methods of imported abstract classes or interfaces from different project -

i've downloaded large project source control includes multuple projects-as i've done before without trouble. class depencies defined , can import packages eclipse without difficulty.

this time seem have difficulty communication between projects. errors seem due classes extending/implementing abstract classes or interfaces. if class in 1 project extends or implements class or interface project end getting exceptions when class tries call or override inherited methods. i've checked build path , seems correct, , i'm able import abstract class , interfaces, not use methods them. issues occur when interface or class being implemented exists in different package class implementing it.

i've tried refreshing packages, cleaning , rebuilding, , doing rebuild ant scripts, none of these changes seemed help. can suggest may wrong?

incidentally when checked out source control think may have gotten of eclipse metadata had been checked in mistake; may explain how eclipse got in inconsistent state.

thanks!

if compiling fine getting classnotfoundexceptions @ runtime, need make sure what's visible in classpath tab of run configurations matches project's build path.

this ensure running same classpath building with.