New to Java

I have some old code and it uses import com.sun.java_cup.internal.parser
When compiling gives error on this.

Googleing this shows that its part of the rt.jar file. rt.jar is in the jre/lib folder. That is part of my classpath but still wont compile how do i find what an import belongs to and where can i download these jar files..


Java really is not a friendly language to me.