Splitting Large GWT app into several modules

I have an app written with GWT and GAE where every supported city has its own app. Clearly this is not the best way to manage the map so I want to merge them all into one app. Currently my app is at the urls sub1.myapp.com, sub2.myapp.com, sub3.myapp.com, etc, and I want them to be at myapp.com/sub1 ,myapp.com/sub2, etc. All the supported cities share common code, so I'm going to put all the that code in one module, and have a different module for each piece of unique code block. Is th开发者_开发知识库is going about it the right way? How will the different modules interact?

Also, I currently have JSPs at sub1.myapp.com/listofsomesort and I would like to move these to myapp.com/sub1/listofsomesort. Is there a simple way to accomplish this?

By making a module with EntryPoint for each old application, in one and the same application. Each module has one 'welcome page' which you can put in different directories. All the shared code can go into another module. The shared code can be used by the inherit setting in other modules.

The only thing I bumped into was that when you deploy to GAE, ALL modules should have an entry point, also the library modules. I solved it by adding a dummy EntryPoint to them, that does nothing, but still searching for a better solution. See my question at How to deploy GWT Project containing GWT modules without entry points with Eclipse GAE plugin?.

This seems like the job for Code Splitting :) It might require some changes in the structure of your code, though - depends how tightly coupled your classes are. A compile report should tell you if your code splits up nicely, or if not, where the connections are.