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James, To add to Joe's comments, a lot of the infrastructure is done if you are working in a Sevlet environment. We use an open-source framework called Struts (http://jakarta.apache.org/struts). Struts helps to enforce what Joe is talking about. Struts is designed to supply a Model - View - Controller (MVC) or Model-2 structure that is similar to what DDS and 5250 data streams provide for green screens. Struts also provides validation and format (Tiles) support that go beyond what you find in DDS. Like Joe mentioned, you have to keep track of the session related information. Separating this from the presentation (your JSP pages) is a goal. The latest release of Struts, which is also the initial release, has no workflow management built in, but the latest development sources do. That support is designed to facilitate multiple form progressions. Overall, Struts is lightweight. If you need something more inclusive, Expresso would be a good bet. Beyond this, you get into EJBs, which simplify some operations, but complicate the overall design. David Morris >>> joepluta@PlutaBrothers.com 01/04/02 11:03AM >>> > From: James W. Kilgore > > I have a dumb question: How do you keep the panels and programs > in sync when the > user presses the back button or jumps to a different panel in > their history? The way I do it is to keep a session ID and a panel sequence. The servlet checks to make sure the correct panel is being returned, and if not, redisplays the correct one. This also allows integration with other web applications. Session timeouts are another issue, either from browser sessions ending or from called programs failing. The truth is that there is some infrastructure work to be done, but once you do it, you can end up with an environment every bit as robust as your old 5250. Joe Pluta www.plutabrothers.com
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