jar vs class in applications

I'm doing an application, presentation with Jsp's and logic with java classes into a jar, accesed like beans.
What's better: use the classes into a jar or use they standalone ?
The question is because the application is not more developed by me alone, and is a little bit dificult to share the updates.
Thak you in advace

If you're working with JSPs, then you're working with Web Apps. Typically, the classes you develop are put into the classes subdirectory of WEB-INF. Then the whole thing can be put into a war file, which is really just a jar with a different extension. You could also put them into a separate jar, and put the jar into WEB-INF/lib. That's usually reserved for classes that don't change much, especially third-party libaries.

Thank you