try deleting those entries from build path (make sure you leave the jars which eclipse already can find).


right click on project

go to properties-->java build path--->libraries

add all library that needs in your project

and also check your java compiler

go to properties-->java compiler

choose necessary java compiler

------------------------------- or ---------------------------------------------

it may be possible that required jar files are not present in your lib folder


if you are using eclipse ,then right click on project

properties->java build path
now check source all class file src is added or not,
check libraries that all necessary jar is added or not

if yor are running through comand prompt then you need to set path in command line 

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