Including JAR files in Eclipse (App Engine) project

Question

I have been searching for a solution for this issue for multiple hours today and many hours yesterday so I decided to address it here, although it seems a stupid issue.

Answer 1

Copy paste the .jar files to war/WEB-INF/lib and then go to Properties(of the project in Eclipse) --> Java Build Path --> Add JARs --> Select the related .jars from the current project. You should be all set!