jar files not working

[madank]

i have downloaded servlet-api,jsp-api.jar files. after extracting the jarfiles when i am clicking on that jarfiles i am getting "Failed to load Main-Class manifest attribute". what is the meaning of this message. tell me whether the jar files are properly downloaded or not

[Dheeraj Joshi]

That means there is no main in any of the class file. To execute a jar file you need a main.

And may be this jar file is not meant to execute at all.

Regards
Dheeraj Joshi

[jkmyoung]

Those aren't standalone programs; they're meant to be library classes you put in your buildpath.