Design a web system with diverse modules

I am developing a web system, but never developed a system that supports various subsystems (modules) and I am need help to do this. I am using the following technologies: JSP, Servlet, Shiro, Hibernate.

The user will access the web system using the ‘login.jsp’, and according to your login will be redirect to your subsystem. Always I will create new subsystem if I get new customers with new needs. I designed the architeture as follows:

webapp
css
    module-x
    module-y
    module-z
js
    module-x
    module-y
    module-z
modules
    module-x
    module-y
    module-z
images
    module-x
    module-y
    module-z
META-INF
WEB-INF
login.jsp

The JSP files will be inside the ‘modules’ folder, in their respective module.

I believe that this architecture is not the best to be done, but i have no idea which is thebest way to design this. I would like some help to start developing correct and clear way.

One of the problems already visualize before implementing this architeture is that when the user access your system will appear in the browser: http://ift.tt/1dCLitR . I do not think it’s cool that appear in the header the url of the file.

Thanks in advance.