Spring MVC Modular Application with multiple web projects

I have began to develop an enterprise web application with at least 20 modules. In this project a need to install every module seperately as you know. What I did not succeed; how can I do every many module at web side.

For instance; I have core web module and in it there is login and main screen page of this system. I want to develop each modules with its own .jsp pages in it(Its own forms, own dialogs even own js files etc...).

To do that I need to create web modules differently. I dont want to create one web module and many standalone modules. Because I can not put on modules view pages into core module. When a upgrade needed for oany module, I must change only this module. If I put all jsp in a web module then I have to change it too.

I have to change only requested module. How can I do this?