Replying to myself... > -----Original Message----- > From: Martin Cooper [mailto:[EMAIL PROTECTED]] > Sent: Thursday, September 19, 2002 3:24 PM > To: 'Struts Users Mailing List' > Subject: RE: [AGAIN] Duplicate values on both ActionForm error. > > > > > > -----Original Message----- > > From: Hoang, Hai [mailto:[EMAIL PROTECTED]] > > Sent: Thursday, September 19, 2002 10:44 AM > > To: 'struts-user' > > Subject: [AGAIN] Duplicate values on both ActionForm error. > > > > > > I've a master-detail page setup where the master page > > contains a number of > > items with hyperlink to the detail page. The problem > occurred when I > > updating on the detail page and submit the update back to the > > database and > > forward the request back to the master page. Specifically, > > the property > > value (called it actionName = "update") on the ActionForm of > > the detail page > > forwards it value to the ActionForm of the master page. Do > > you know why > > this happens? Thanks. > > This is just the way it works. If you forward a request using the > RequestDispatcher (which is what you are doing - or rather, > what Struts is > doing at your request), all of the original request > parameters are still > present, because it's actually still the same request. > > If your first action forwards to a URL that has additional > parameters in it, > those parameters will be added to those in the original > request, so the > combination of all of them will be seen by the second action. > > The only way to avoid having the original parameters be > passed on to the > second action is to use a redirect instead of a forward. The > main problem > with that is that it costs you a round-trip back through the browser.
BTW, this is all explained in the Servlet spec: http://java.sun.com/products/servlet/download.html > > This is just one of the reasons that action chaining is not > recommended in > Struts applications. There are many more - just as Craig. ;-) I meant "just *ask* Craig"... -- Martin Cooper > > -- > Martin Cooper > > > > > > > > ______________________________________________________________ > > ___________ > > Introducing the all new and improved continental.com. With a > > totally new > > personalized design, it's the best place to go. Before you go. > > > > Continental Airlines. Work Hard. Fly Right. > > > > http://www.continental.com > > > > > > -- > > To unsubscribe, e-mail: > > <mailto:[EMAIL PROTECTED]> > > For additional commands, e-mail: > > <mailto:[EMAIL PROTECTED]> > > > > > > > -- > To unsubscribe, e-mail: > <mailto:[EMAIL PROTECTED]> > For additional commands, e-mail: > <mailto:[EMAIL PROTECTED]> > > -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
