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Java Forum / General / November 2007Design pattern needed: breaking webapp into modules
We've got a webapp that has different modules. Let's say, just as an example, the modules are Editing, Querying, and Reporting. Each module has its own set of JSP pages. The modules also have some sub-pages in common like headers and footers. We'd really like to distribute the modules independently. A customer might buy only Editing and Querying, but not Reporting, for example. One of the modules is open source, which means that we'd like to distribute it as a complete, standalone project. But we'd also like to be able to integrate it with the rest of the webapp easily. Does anyone have a good design pattern for this? I'm struggling with how to organize the webapp, where to put the pages, how to have independent projects that share common pages and code, etc. Any ideas appreciated. > We've got a webapp that has different modules. Let's say, just as an > example, the modules are Editing, Querying, and Reporting. Each module [quoted text clipped - 11 lines] > to organize the webapp, where to put the pages, how to have independent > projects that share common pages and code, etc. Any ideas appreciated. EAR - Enterprise ARchive. Give each web app component its own context. I've done this and it works all right.  SignatureLew >> We've got a webapp that has different modules. Let's say, just as an >> example, the modules are Editing, Querying, and Reporting. Each module [quoted text clipped - 17 lines] > Give each web app component its own context. I've done this and it > works all right. Thanks. What I haven't been able to figure out, though, is how to share the files that are common across modules. When I try to do a jsp include of a file that isn't in the current webapp, I get an error message to the effect that I can't access resources outside the current context. > Thanks. What I haven't been able to figure out, though, is how to share > the files that are common across modules. When I try to do a jsp include > of a file that isn't in the current webapp, I get an error message to > the effect that I can't access resources outside the current context. Right. <jsp:include> isn't the way to do it. It's analogous to using cooperative programs - they wouldn't use each other's variables, but communicate more indirectly. If you're selling separate modules to your customers, they will have that degree of independence anyway. In the application I did recently that used multiple web modules, we used <http://java.sun.com/javaee/5/docs/api/javax/servlet/ServletContext.html#getConte xt(java.lang.String)> then <http://java.sun.com/javaee/5/docs/api/javax/servlet/ServletContext.html#getReque stDispatcher(java.lang.String)> off the new ServletContext to manage the switch between contexts. SignatureLew >> We've got a webapp that has different modules. Let's say, just as an >> example, the modules are Editing, Querying, and Reporting. Each module [quoted text clipped - 17 lines] > Give each web app component its own context. I've done this and it > works all right. Do you know any easy-to-understand tutorial or something about this subject? We're having our graduation project this spring and we might make a solution built on Java EE. Currently we've learned about the Java EE containers (Servlets, JSP, Session beans) and some Java Persistence. We're very interested in making modules like Chris is talking about (offering different "packages"). I've looked a little bit into dynamic class loading and such some time ago and I thought "aha, we could use this", but that's not the way to do things in Java EE is it? > Do you know any easy-to-understand tutorial or something about this [Java EE]? Java? Tutorial? Java tutorial? Java EE tutorial? Hmm, let's see, where would one go for a Java tutorial, specifically a Java EE tutorial? Where would one go? Hmmm, could it be ... <http://java.sun.com/javaee/5/docs/tutorial/doc/>? SignatureLew No, the answer isn't, "Satan!", Church Lady. >> Do you know any easy-to-understand tutorial or something about this >> [Java EE]? [quoted text clipped - 4 lines] > > <http://java.sun.com/javaee/5/docs/tutorial/doc/>? =) I meant specifically about modularization and "contexts" as you mentioned. Any pointer much appreciated. > We've got a webapp that has different modules. Let's say, just as an > example, the modules are Editing, Querying, and Reporting. Each module [quoted text clipped - 11 lines] > to organize the webapp, where to put the pages, how to have independent > projects that share common pages and code, etc. Any ideas appreciated. I suggest looking into Spring Web Flow, it was design specifically for this purpose. SignatureDaniel Pitts' Tech Blog: <http://virtualinfinity.net/wordpress/> Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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