Re: JSF and Struts Actions
This is so cool. I was hoping for this sort of thing. This is getting close to grown up. I wish I could see this stuff now. Man! Don't forget that JavaServer Faces has a two-level architecture -- user interface components that are render-independent, and renderers that construct a particular markup language. HTML is only one possbile output format, unlike Struts tags where (in JavaServer Faces terms) the rendering markup is baked in to the UI component tags themselves. Craig McClanahan Hmm.. I don't see why this is cool yet. The last time I looked at JSF, it appeared to be an attempt at re-invention of GUI concepts on the server side. Will the sophistication of such controls eventually approach what is available on a reasonable desktop PC today? And even when it does, the fact that server based UI's are going to involve all sorts of network/latency issues pre-dominate.. no? It is clear that rich-client based approaches offer richer interaction than web pages today, and embedding such controls in web pagesis possible (using MSFT amongst others) today. Innovative approaches exploiting java also currently exist (see nexaweb, thinlet etc). I saw these latter as re-inventing X11 (since they are focussed on the protocol that transmits bits between the server and client), and now JSF is proposing to redo the same but at the Xt or Motif level (to use a much-abused layer separation). Personally speaking, I find more work at the back-end interesting but I would like to know how it would impact the front end. The stuff we (as programmers) have trouble with really is still in the front end.. take a sampling of struts questions/traffic and I really wonder what percentatge of the traffic has to do with layout, jsps, event, security, controls (calendar/pagination etc.) .. all GUI/HTML/frontend stuff. Will JSF make writing such front-ends easier.. and if so, how? - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Q: more an HTML/JSP issue rather than struts.. but..
Hi, I have the need to scroll the displayed jsp page (as the result of a struts action) to a specific place on the resultant html page. Is there a standard way to do this? (I thought one could use javascript onLoad or somehow re-write the URL to force the browser to move to an anchor, but both don't seem to be working.. I suspect it might be that struts is rewriting the visited page URL to be the action.do page somehow which always moves it to the top? ). Thanks. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Struts Performance - Any Benchmarks?
I now use dbMonster to generate lots of db data and DiselTest to stress test. (linked on baseBeans.com downloads and cheat sheet pages) Thanks for the pointers Vic. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: more an HTML/JSP issue rather than struts.. but..
1. With plain HTML, add #anchorName to the URL that appears in your browser's address bar, and then a name=anchorName where you want it to be. Hi, Matt -- thanks for your response. But how do I do this in struts.. (i.e. just appending the #anchor to a struts form's action still doesn't make it appear on the browser's address bar -- almost as though the struts framework is swalling it someplace). I'm beginning to suspect I need to break and trace down to where it gets the URL and how it breaks it down.. Thanks. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Struts Performance - Any Benchmarks?
I've been following this thread w/ interest. Thanks for all the posts. Overall, it sounds like your team is likely to succumb to premature optimization anti-patterns, and totally fail to understand what is really important about web application design. That's pretty tragic when it happens, because it's totally needless -- most of the things your team is stressing over are TOTALLY IRRELEVANT to the end user's perception of performance of your application. They are worried about the wrong things, at the wrong time in the development cycle. Craig -- I think that would be a bit premature. It has been my experience that a lot of IT shops would like to know what kind of hardware to buy etc. (i.e. down to the model number of the load balancer). Personally speaking a lot of it is pre-mature (in fact I've even had one IT manager proudly point out how he got a fixed price for 90 days extension from a hardware manufacturer -- firmly forgetting the fact that if you wait 90 days most such hardware will go down in price :), but .. people need guidelines because the lead-cycles organizationally on such architectural decisions tends to be all over the map. One possible approach would be to build a prototype using Struts, and exactly the same functionality using whatever design approach your team thinks will work better. It's pretty much a waste of effort, but some people won't be convinced any other way. I think it would be great if people could post their experiences wrt. performance. i.e. at what point did splitting servers, more advanced containers make sense etc. Personally speaking, I'm going through a major struts based project myself. Things seem to be working well so far, but I must admit that now the load is going from the tens to the hundreds of simultaneous users.. and the latency of some of the accesses are from far away (separated by multiple routers) I'm wondering what our next steps ought to be -- if customers start complaining :) Thus far we've been able to get away with apache + tomcat instances. (The critical piece of our application is one where users sort some pretty large datasets.. which can also be modified by other users.. right now the design reads the db. upon each significant re-sort operation, but paging thru and editing is done entirely w/ the data set cached in session). Benchmarks to me are not only about tee-ing off against alternatives. Benchmarks often tell me what combinations of hardware/software people ended up using, and I often find that useful. My $.02 cents. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: How do you keep your session junk free?
Over on another mailing list I'm on the consensus is that continuation-style programming is much better than the present approaches suggested by struts and other frameworks. In particular, they solve the back button/refresh type problems much more cleanly than other languages/frameworks. As a Lisp programmer I find that appealing, and I just wish people in the Java camp knew more about it.. here are a few links that I've been suggested to follow up (I haven't had the time yet to fully evaluate them :) Unfortunately there doesn't seem to be much by way of tool support for these frameworks (yet). http://www.beta4.com/seaside2 http://segment7.net/ruby-code/borges/borges.html Schecoon -- does anyone know the status on this project btw? http://youpou.lip6.fr/queinnec/Papers/www.ps.gz http://youpou.lip6.fr/queinnec/Papers/webcont.ps.gz - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: How do you keep your session junk free?
Explain how some other approach handles it in any better way? Use of token to prevent duplicate submissions works for me. And what do you mean by a continuation-style programming? Hi, Rick: CPS is a commonly accepted idiom for representing what a program does next in your language. Some languages such as Scheme (a lisp variant/dialect) have strong support for it.. In languages such as these.. you can actually write int x = 5; x = getValue1(); y = getValue2(); where getValue1 and getValue2 display the appropriate pages etc., and when the user hits the back button your program's state gets unwound to the point where it should be.. w/out ANY extra coding! You as a coder wouldn't have to write any code to set the variable x's value back to what it was etc. Obviuosly in languages w/out continuations and closures, people tend to simulate them w/ tokens, inner classes etc., but these are VERY POOR substitutes for these things. If you google those terms I'm sure you'll get enough hits to keep you busy for a while (I personally learnt cps stuff when I worked w/ Jeff Siskind's Screamer which augmented Lisp with non-deterministic primitives :). I think some of the scheme papers wrt. continuations are classics, and explain how you can do things like co-routines etc. w/ them. Be prepared to bend your mind a lot though -- I've never been able to teach continuations easily -- most programmers (me included) who grew up with Fortran, Pascal and C etc. have a *very hard* time grokking them initially. If you run across good explanations that help you understand it, let me know.. I'm always looking for new pedagogical tools for this. (I understand that both Python and Ruby camps are investigating adding support for this sort of thing :) - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: struts IDE
Jbulider8.0 and Eclipse Do either of these provide breakpointing ability in JSP's, and traversing transparently into container code. My current environment (which is WSAD 5.0 built on top of Eclipse) doesn't do this, and I find it annoying. The other annoyance I have is that when I run tomcat and hot code replace a method -- if I save the file.. tomcat actually restarts the entire web-app. Does JBuilder do any better? - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Nesting logic:iterate
Hi all, is it possible to nest iterate-tags with Struts 1.1? Hi, Heiko: I've had luck with patterns similar to what others have suggested, but if you have plain lists or vectors inside lists or vectors.. a better route to go is to try logic:iterate id=row name=bean property=myproperty logic:iterate id=element collection=%= row % do something w/ element /logic:iterate /logic:iterate I don't happen to have my examples handy (I'm still at home :), but hope you get the idea. As another person suggested if you have the inner element defined as a bean property on the object bound to row.. then you can use name/property as well. The scoping gotchas of struts are plenty -- this is one of them that I stumble across often :) - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: [OT] Text editor usage (was RE: [OT]: What is vim?)
:). In any case, OTI is an ex-Smalltalk IDE shop, so I presume there's a strong NIH syndrome there similar to most other IDE's I've run across -- Then why is there an Emacs keybinding preference setting but none for vi? David Huh? I can't quite understand what you are asking David. If you are asking why emacs instead of vi -- I can only offer that perhaps Emacs users asked them for it repeatedly (OTI used to build VisualAge suite of products before being acquired by IBM, and perhaps found the emacs demands harder to ignore :). If you are asking why emacs at all? given what I said about their NIH syndrome, I have to point out that the emacs key-binding support in Eclipse is much like the key-binding support within Visual Studio or .Net IDEs.. they are very poor implementations, and I'd rather not have them at all. It is a great mistake to think that just by simply rebinding keys you can get emacs-like behavior.. if you've used things like the keyboard macros, key-rebinding support, regexp search, file commands etc. etc., you will see that deeper integration can provide a lot more benefits. I think an open plugin-based IDE like Eclipse can do much, much more.. by actually embedding Emacs within the IDE as a true component plugin, much like it allows the embedding of multiple HTML/JSP editors, viewers or VCM tools etc. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: [OT] Text editor usage (was RE: [OT]: What is vim?)
I didn't want to get into this -- since editors are religion :) but personally I use editors for editing code (although I must admit that Eclipse's ctrl-space/and factoring helpers are beginning to win me over :), and IDE's for debugging. (in multi-threaded apps, there's no comparison -- I can be in and out of a complex remote situation, set breakpoints on exceptions etc. w/ a couple mouse clicks, in the time it takes me to figure out where jde or gdb is going to take me next. And anyone who's still typing print x instead of using modern inspectors is just asking to be competed with and put out of business :) In summary, I like my hybrid approach. And I am trying to convince Eclipse guys to have / create a true Emacs plugin .. although I don't see any takers yet. Regards. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: [OT] Text editor usage (was RE: [OT]: What is vim?)
In summary, I like my hybrid approach. And I am trying to convince = Eclipse guys to have / create a true Emacs plugin .. although I don't see any = takers yet. wonder why. I don't see any smileys, so I'll presume you are asking this seriously. I did submit a bug report/enhancement request relating to this, and got pointed to several others that were similar. (I did this right after I discovered Incremental Find.. was not really Incremental :). In any case, OTI is an ex-Smalltalk IDE shop, so I presume there's a strong NIH syndrome there similar to most other IDE's I've run across -- but I must admit that the Eclipse approach is a lot more open -- which is why I tried. I've hacked gnu emacs code in the distant past (things like rmail/rnews etc. in their very early incarnations which later morphed into other forms :). If I can rustle up some free time, I'll probably do that -- but I suspect it's going to be a low-bandwidth long lead cycle kind of thing. If you are interested in contributing, let me know. (I have a couple of others who might volunteer as well). - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Wanted: struts-calendar
HI, David: I've used Lea Smart's java script totallysmartit.com calendar hacked a bit (wrt. colors, clip rectangles and so forth) and would recommend it. Hope that helps. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Best way to understand Struts
I have longed for something like this too -- because while struts attempts to solve some very real problems, and does a good job at it, I think the documentation and the mental model that people need to have can be reset straight by a key few pieces of documentation that are still missing. - You talk about UML diagrams and class flows. Personally I've used WSAD/Eclipse to set breakpoints and follow through the code pieces. Typically what I would do is to put a breakpoint in my Action class's perform() method, and then traverse up the stack to look at how things got there, and then when my action class returned follow through how various forwarding logic was working. The most frustrating aspect about struts is that even though the tag semantics is fairly easy to understand.. they sometimes interact in mysterious ways. I still stumble over iterate's inside iterate's, or with html:link or nested, select etc. Since struts uses reflection fairly heavily, your best bet is to make sure you can look at the generated java from jsp's. This will help when some of the exceptions get thrown as they inevitably will. If you can run your container (I use tomcat) in the debugger and set a breakpoint to trigger on an exception that is better -- because several of these container exceptions, or introspection exceptions are very poorly designed. Often they just say exception X -- and you get this huge stack trace of catalina design abstractions that no doubt people labored over, but won't help you in actually divining and fixing the exceptions. - So in addition to understanding how struts is put together I think we really need a much better user level document that is short, devoid of architecture verbosity, and clearly introduces the scope/semantics assumptions that guided the tag design and you need to know to get work done, the back-end flow and a debugging methodology to take when things go wrong. Maybe the struts experts have all written books to do this -- and that's probably the economic/business model for struts (after all it's open source, and you didn't expect to get this kind of software for free, right :)? In any case, I'd be happy to help out in any way I can if people think such a thing could be useful. Regards. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Struts to JSTL EL - Taglib 1.0 implementation
Seriously ... it would be nice if JavaBeans recognized something like mapped properties. But that is for the future -- in the mean time, you'll need to stay within the limits of what the JVM recognizes *now* if you want to leverage EL expressions. Craig -- IMHO, if you look at Lisp.. symbol-plist and friends, one could argue that such facilities belong at Object not Beans :) Seriously -- Java is getting better (I hear 1.5 is going to have generics) at learning from Lisp. Hey.. perhaps one of these days we might even get defmacro which will make all this jsp/tag/expression stuff seem well.. just plain passe. :) Regards. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
[OT] RE: validate() method is ActionForm
Any more personal attacks like this, or the previous response's profanity, are likely to get you banned -- then you won't have to worry about questions you think are below your dignity to answer politely. Craig McClanahan Thank you Craig. I think this list is great, and now that I'm slowly getting struts -- this week has been much better than last, I'm able to see it's power. I still haven't played with DynaAction forms, but if they can reduce the proliferation of forms classes I seem to have now.. more power to struts. Thank you (and to the rest of the list) for the patience w/ which you answer -- it makes the list and struts itself valuable. I normally wouldn't say this, but the author posted about whether or not a form's fields would be filled before validate() is called. My reaction was the same initially as several others on this list.. i.e. hmm.. hasn't he read the manual? I then recalled my frustrations in those early days w/ struts (just a few days back).. and I remember being unclear about several things. what does the 'struts' framework do behind your back to make your life easy for you would be a great topic in the documentation.. it sort of says that .. but that information is mixed in w/discussions about MVC2, and then other details .. so a 'just what the code does in 1.1b2' section would be great. Thankfully, I finally got my source debugger to work with it, so I've been setting breakpoints and learning. struts is actually quite simple -- once you see what it's doing. Just a suggestion. ps. when things work .. people don't ask such questions. It's when you read about bean:define or nested:text and then try it, and it throws an exception that shakes your mental models, that you need to map, cross-check your understanding with reality again. Thanks. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: RowSetDynaClass
Hi, Craig: Just catching up on email, and caught your very good explanation of RowSetDynaClass.. I didn't know it existed, so had written something like it myself, w/ returning two Collections (one for the column names, and another for the data set). But I have a follow up question re. what you say below: PS: There is a performance tradeoff with the approach described above, because the data is copied into an in-memory array. However, one key advantage is that you can immediately release the database resources for the query, so that the ultimate page that renders the output does not have to worry about it. Most of the no-copy solutions I have seen require you to deal with closing the result set, and/or releasing the connection back to the connection pool, in the JSP page itself. To me, that does not seem like something you really want to make the page author worry about. PPS: If you're using JSTL in your pages, the javax.servlet.jsp.jstl.sql.ResultSupport class can be used in a manner very similar to what is described above, but makes the query results easy to access via JSTL tags. That way, you won't be tempted to code the SQL queries directly in your page, which doesn't really fit into an MVC paradigm :-). I agree that this approach works well for small result sets. However, if there are say 10k rows.. it would be nice to have such a class work together with a Pager tag set.. any thoughts re. that? Thanks. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: forwarding to another action ..
From: Sri Sankaran [EMAIL PROTECTED] To: Struts Users Mailing List [EMAIL PROTECTED] You haven't given enough information below (seems like a continuation of = some previous thread). I *think* what you are trying to do is go forward from one action to = another [*] but before so doing removing a attribute from the request. = If so, some obvious checks would be - ensure that the request.removeAttribute(...) *is* being invoked - ensure that there isn't some logic in your admin action whose role is to add one of these objects into the=20 request Sri: Thanks much for your reply. You are right, perhaps I omitted to state completely what I was/am trying to have happen. Basically I have an application where there's a master page .. (I mean master in the master/details sense). The user clicks on ONE of the items displayed in the master, and goes into a task loop where he or she might spend several iterations operating on the item they are dealing with. This dispatches to several actions, queries, updates etc. When they are done, they close the item, and at that point, I want to go to the master page again. Now .. one could argue that the master jsp is what I should merely forward to from one of the details panel's close action, but I really want the view action of the master page executed.. (since this view action queries the database etc. and composes the view of the master page). Forwarding to the master jsp from the detail would mean that I would need to construct and set up the request and session attributes for the master page in the close action of the item, which just doesn't seem right to me. So I thought.. hmm.. it should be easy to have a goback action on the detail that dispatches to the view action on the master. Is that not the right way to be thinking about this? Does it make sense now? I have verified that request.removeAttribute() is being called. (I can step past it.. correctly). Weird thing is that I notice in struts the same request object is what struts uses.. but at some point it dispatches to my container's dispatcher.. so I'm wondering now if this is really not a problem with struts so much as the container (unfortunately it behaves like this in tomcat too). Any thoughts on what I might check next? Your suggestion about checking if something is not adding the attribute I'm trying to remove is a good one. I don't think so.. but I'll double check. Sri [*] Check out the archives for various threads on action-chaining. It's = a slippery slope Why? Is this not a good/blessed way of doing things? Just curious to learn the right idioms. Thanks again. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: jsp, multiple forms and beans
Hi: This statement caught my eye because I was about to do something like this. I would avoid using multiple Forms per page. In my application the user is going to assemble a complex set of things, and in order to do this needs to view another set of things. The view step involves querying, and viewing what's available say .. multiple times. The common way to do this might be to dispatch to a ComposeForm .. which then dispatches to a ViewForm and then the latter jumps back to the composer once the user is ready to assemble X or Y. What I was wondering about was to have both these on the same page. Ideally if I could have two forms on the same page/jsp.. both dispatching to different actions that each then dispatch to this same jsp, that might be a better task flow because the user then gets to see both the stuff being assembled and the results of his queries (the view part) right next to each other.. Are you saying that struts does not allow this? (I've had several problems w/ struts so I'd rather not waste time on something that won't work :) - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
how to forward to another action..
Hi, I have a master form w/ several rows, the user clicks edit and there's another form with details.. the user edits, and then clicks save. At that point, I'd like to go back to the master form.. Ideally from the detail Action .. I'd like the save to dispatch to the master Action that populates other things .. Is there a clean way to accomplish this sort of thing? I see references for Actions forwarding to other actions etc. so I'd appreciate seeing a detailed example or pointers to relevant docs. Thanks. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Q: forwarding to another action ..
Hi, I finally figured out that the problem w/ what I was trying to do was that the back forward didn't have the .do. Once I included the .do things seem to work. (i.e. I can have my compose, save etc. actions forward back to the master action in certain cases). forward name=back path=/admin.do /forward However I now have another problem. I'd like to make sure that a certain request.attribute is removed when I go back to the master form. So in the above action I do a request.removeAttribute(someName); But surprisingly I find that in the admin action this attribute is NOT removed. It's almost as though the someName attribute is saved and restored when I forward through back. Why is this happening? I would have that the life-cycle of a request remains the same.. and struts wouldn't muck with it behind my back.. Any help will be much appreciated. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Newbie Question on Performance
From: Peder Jakobsen [EMAIL PROTECTED] I'm new to Struts, and so far I'm very happy with what I see. But I have some suspicion that it'll be dead slow. What leads you to this suspicion? There's no way to respond to such a FUD-sounding :-) comment without specifics. Craig: While this is true, I think Peder's question deserves a more thoughtful response. Struts relies exclusively on reflection, and someone should do some detailed studies and post them. You have responded before when I asked about interface vs. implementation etc. and I must say the arguments don't sound very convincing. There is definitely code-bloat with all these classes and parsing and dealing with strings repeatedly at multiple layers (and I know about the Plan9 argument that it's a small % of cpu time :). While it is true that logically this should all help with design -- my personal benchmarks against other technologies such as Zope or ASP vs. struts indicates that the latter is good but still has a ways to go. The slowness in terms of productivity etc. may be due to other factors such as lack of documentation, lack of clarify wrt. life-cycle of certain objects, lack of good debugging tools for jsps' etc., but if struts promises elegance, productivity and performance, my thoughts are it still needs a whole lot of work. The perception I also get wrt. people like you and others moving onto JSTL and JFaces also does not give the warm and fuzzies to others seeking to adopt struts. Don't get me wrong, either struts is great stuff, and people are using it for high-volume sites -- go see 'X', 'Y', 'Z' (which is what I, (and I suspect Peder) was hoping to hear) or it's supposed to help you write web applications with Java and JSP, and it's good for small apps say with 10's of pages, but if you want to do really complex things, or high volume sites.. you need to do .. which is it? Don't get me wrong -- struts does do certain things well, and some of these like dev. tool support, or performance may be entirely out of struts' hands (as you point out wrt. database vendor choice, containers etc.). But I firmly believe in the developer hierarchy.. if you are a framework guy, you've got to listen to people who drive applications and people who do OS's -- and your statements carry a lot of weight -- and presumably you've heard from more users of struts out there than most, so if you know of high volume sites, please do tell :) Has anyone had to abandon struts because it was not performant? Does anyone out there serve A LOT of requests? (We run 12 load balanced quad Xeons and we can barely keep up! We have about 1 million users on our site) - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
is there a way to get struts to interact well w/ scriptlets
I notice that if I use nest: I end up getting input fields whose name looks like so input name=foo.bar This really doesn't play well with all the java script code we have that rely on eval'ing target names such as window.document.someform.somelement. If someelement is in dotted notation, eval on the java script side tries to traverse it and throws errors. Obviously I like the serverside traversals that nest gives you, but I'm wondering how I can solve this problem. Any ideas will be much appreciated. And please, no suggestions for avoid java script because I have to use user interface elements like calendars and spin controls etc. that I need on the client side :) Basically I'm looking for what the struts sanctioned way of doing this is.. Thanks. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
nested:multibox broken? in 1.1b3?
Hi, I'm trying to use nested:multibox, but I can't seem to get Values printed out. I'd like to be able to write td nested:multibox property=dayStrings value=MondayMon/nested:multibox /td td nested:multibox property=dayStrings value=TuesdayTue/nested:multibox /td ... etc. I see that the checkboxes are rendered ok when I do this. But I don't see any of the Mon or Tue strings. If I do a view source.. I see input type=checkbox name=selectedPreference.dayStrings value=Monday No /input tag or the Mon/Tue etc.. What's going on? Any help will be much appreciated. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Rendering alternate rows of a table in Struts
Hi, Craig: JSTL in particular covers a huge amount of ground on the nitty gritty things, and (where it overlaps with things in the struts-bean and struts-logic libraries) does it much better, mostly thanks to the expression language's power. I couldn't agree w/ this statement more after spending a bunch of time struggling with struts's syntax etc. I would like to ask a question about JSTL though.. admittedly I've only glanced at the manual and not used it for anything real. Does the JSTL envision to expand to include/replace struts/forms/action functionality on the server side? I didn't see any references to such .. but may be I missed it. Thanks. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: nest sytax.. looks cool but does it work? :)
Hi, Sri: Thanks much for responding to my post. You write.. nested:form action=3D/someAction.do %-- print the userFormName property of UserForm --% nested:write property=3DuserFormName/ %-- Iterate over all the UserPrefForms --% nested:iterate property=3DuserPrefForms I almost have this but my selected preference is a property of the top level form.. I essentially have nested:form action=/empPrefs nested:nest property=selectedPreference nest:text property=someattribute From all I've read this should work. But it doesn't. I get the exception shown below.. Any help would be much appreciated. Thanks. - javax.servlet.ServletException: BeanUtils.populate at org.apache.struts.util.RequestUtils.populate(RequestUtils.java:980) at org.apache.struts.action.RequestProcessor.processPopulate(RequestProcessor.java:779) at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:246) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1292) at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:510) at javax.servlet.http.HttpServlet.service(HttpServlet.java:760) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) blah de blah :) - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: session timeout not working anymore :(
Best Suggestion is: 1)Over Ride ActionServlet and place session expire code(redirect login page or some other stuff). This will work for if the user clicks any buttons, action events. 2) Now we need to handle page refreshes (i.e JSPs) write a simple jsp, which consist simple logic check session, if session is null redirect to login page or some stuff. Include this jsp, where ever you required. But Ashok -- this is exactly what we have. What do you do if request.getSession(false) does NOT return null as advertised when the session has actually expired? I don't think moving the logic elsewhere will help, and I don't really care that much about re-factoring etc. In short, I think this is a bug! and I'd be happy to hear how you've solved it if you've experienced it. Thanks. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
nest sytax.. looks cool but does it work? :)
I finally gave up w/ 1.0 and moved to 1.1b2 (the one that comes w/ WSAD). And the first thing I try w/ it doesn't work, so I must have the wrong model again. So here goes; I have a top level User -- who has a bunch of Preferences. There is a UserForm, and a UserPrefForm. The UserForm has a collection of UserPrefForm, and in addition has a property called selectedPref which actions set to one of the UserPrefForms. (The reason I want to do this is simple: I want to display a table with all the UserPrefForms in summary form, and when the user clicks on a Preference to display the detail along with the form). The trouble is how can I display a UserPrefForm's fields when I'm displaying a User? So I think nested can help. 1. I first try nested:text property=selectedPref.someField /nested:text Doesn't work -- PropertyUtils.throw an IllegalArgument exception -- No bean specified. 2. I then try nested:nest property=selectedPref html:text property=someField... /nested:nest and nested:nest property=selectedPref nested:text property=someField... /nested:nest nada .. 3. Then I think.. hmm I did read something about root and maybe that's needed to set the scoping right.. nested:root name=selectedPref ... /nested:root Now I get selectedPref not found in any scope! How is this supposed to work!!! Frustrated. p.s. do I have the right model here.. that if I use the nested tag, and invoke the action (say Save), the populate process in struts will find the appropriate selected preference and save the nested fields in the selected form. Note that this is what the document seems to imply with all the discussion of bananas and monkeys.. does the code not correspond to the documentation? (I was assuming that I'd get bi-directional transfer.. i.e. from the forms to the jsp, and vice-versa.. i.e. jsp to actions to the forms -- and that such master-detail traversals are what nesting was designed for). If I have this wrong, or if the implementation is just plain not working yet, please could someone let me know. Thanks. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
session timeout not working anymore :(
Sigh. We used to have a piece of code included in our jsp's like so:
header-inc
% if (request.getSession(false) == null) { %
jsp:forward page=logout.jsp?TIMEOUT=60 /jsp:forward
% } %
jsp:useBean id=user scope=session class=webapps.common.User/
header-inc
and that was included in our files like so. That used to work.. but
now when I have struts-html and struts-bean.. it always fails.
Is there something wrong with getSession(false) now?
The stack doesn't seem to include the struts generated servlets.. so
I'm really puzzled!!
Any help will be much appreciated even if it's only to say.. it's not
struts :)
I'm running Tomcat 4.18 on Windows XP.
Thanks.
main.jsp
!DOCTYPE HTML PUBLIC -//W3C//DTD HTML 4.01 Transitional//EN
%@ taglib uri=/WEB-INF/struts-html.tld prefix=html %
%@ taglib uri=/WEB-INF/struts-bean.tld prefix=bean %
html:html
HEAD
%@ page
language=java
contentType=text/html; charset=ISO-8859-1
pageEncoding=ISO-8859-1
%
META http-equiv=Content-Type content=text/html;
charset=ISO-8859-1
META name=GENERATOR content=IBM WebSphere Studio
META http-equiv=Content-Style-Type content=text/css
LINK href=theme/tigris.css rel=stylesheet type=text/css
TITLE/TITLE
/HEAD
body marginwidth=0 marginheight=0 leftmargin=0 topmargin=0
class=composite
%@ include file=header-inc.jsp %
---
javax.servlet.ServletException: class com.ascent.webapps.common.User :
java.lang.InstantiationException: com.ascent.webapps.common.User
at
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:533)
at
org.apache.jsp.contactus_jsp._jspService(contactus_jsp.java:355)
at
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137)
at
javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:204)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
at
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at
javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:260)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at
org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2415)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at
org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:432)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:386)
at
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:534)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:530)
at java.lang.Thread.run(Thread.java:536
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Re: session timeout not working anymore :(
You should take this opportunity to refactor your session timeout functionality. Extend the Struts RequestProcessor (or the TilesRequestProcessor) to include your session check and forward. Take logic out of your JSPs : ) Ok.. I don't see either of these in 1.0. Next suggestion please? - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: question re. struts
You don't have a form here - where are you using PointForm?
The code should be something like - assuming you're using struts 1.0.x:
execute (... mapping, ... form, ... request, ... response) {
form = new FooBarBlahForm();
...
// Get model object
...
myForm.setFoo(model.getFoo());
myForm.setBar(model.getBar());
myForm.setBlah(model.getBlah());
return mapping.findForward(success);
}
I'll leave it up to you to find out how to set up your struts-config so
that the form is available in the JSP.
This may be annoying if you have say 15 different items to get and set,
but it provides a clean break between the action and the model and I,
for one, can live with it.
This is exactly what I ended up w/ and as I think you understand, I
wasn't objecting to it, as much as having to write the myForm.setFoo
methods. If I understand the struts position correctly -- there needs
to be a layer (predominantly composed of Strings :) corresponding to
the model layer.
I'll just add that reducing the number of lines of code shouldn't be a
goal - generally, code reductions come about as a result of good design.
Keeping the business logic out of the action as in struts may initially
produce longer source files, but when you find you can start reusing
your model code unchanged in the next release of your project, or when
management makes the decision that you shouldn't be using opensource
software so you have to write your own framework, you'll see where the
code reductions lie.
I'm sorry but I don't buy this argument. I have been for example around
production databases long enough to know the benefits of
normalization, but rarely have I seen big databases follow textbook
clean design principles. I believe one can have performance, clean
design and small amounts of code -- 1.1's evolution over 1.0 seems to
indicate that the struts community is not unaware of these concerns
either.
How is it even possible to produce a usable input form in your UI if you
have hundreds of attributes - or do you mean each of your tens of
objects has tens of attributes?
Nope. Perhaps I should have said tens of attributes. And yes, our UI's
are complex -- they often aren't just text/form-based ones.
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use of html:radio w/out a form possible?
Hi, Kris: You posted in Oct the foll. snippet, which I found
helpful to understand html:radio. You say assuming the form has a
foundPerson property below - my confusion is which form are you
talking about.
For example, consider an application that displays all foundPersons to the
user w/ some summary information. Using the radio button let's say I
want the user to select a foundPerson and then send the selected
user's key to a doOperation action.
In the jsp I can see having a
html:form action=/doOperation
logic:iterate your code below /logic:iterate
/html:form
What's confusing me is that now we seem to have two forms: the form
that could have created the set that logic:iterate is operating
over (imagine a query/search), and the form that will get submitted
when the user selects the radio button and then hits Operate :)
Obviously I'd like the radio and the iterate to operate over the first
form's members, but the page scope in the snippet above is within the
second form textually, so I wonder if the property attribute of the
radio will do the right thing.
I'm probably not quite understanding how struts radios are supposed to
work. This is fairly typicaly in master detail traversals.. and I'd
like to know what people typically do in situations like this.
In my non-struts jsps, I've accomplished this through a small piece of
javascript that iterates over the radio buttons, finds the one that
was checked, and attaches the key from that selected radio button as
an additional attribute to the form (see ruleID below). Any idea on
what the struts-blessed way of doing something like this is? Thanks.
function setRuleFromForm(the_form)
{
var idx=0;
var ruleID = ;
for (idx=0; idxthe_form.request.length; idx++) {
if (the_form.request[idx].checked) {
ruleID = the_form.request[idx].value;
}
}
if (ruleID == ) {
ruleID = the_form.request.value;
}
the_form.ruleID.value = ruleID;
return true;
}
Thanks.
Assuming the form has a foundPerson property, I think you need
something like
this:
logic:iterate id=resView name=foundPersons
html:radio property=foundPerson value=%= resView.getKey() %/
bean:write name=resView property=key filter=true/
/logic:iterate
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question re. struts
Hi, I have a master form that displays a bunch of object. I'd like for the user to select a radio button corresponding to one of those objects and then click Edit. The editaction should obviously display a form corresponding to the selected object. What I'm failing to understand is what I need to do? (i.e. in order to do something like this).. - i need to create an editaction - in it's perform method I need to create/get my model class - write a form class with getter/setter for my model class (this largely reproduces methods from the model, but this class derives from ActionForm)? - set each individual attribute of my model into request parameters - forward to the jsp that contains an input form with the same input parameters All this to do something as simple as display a bunch of fields? :) I must be missing something. Is there a way to reduce the number of classes, and maybe reduce the individual getting and setting code everywhere?? - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
ok.. but how?
David -- Apologies.. but I'm a newbie to struts, and can't understand your statement. Can you perhaps show me what you mean by concatenate strings together? In short, are you saying struts cannot do somehting like this? ps. I have tried different syntaxes such as: li html:link page=%= /action + type % ... etc. but none of them seem to work. -- Sundar == Sundar Narasimhan [EMAIL PROTECTED] writes: Sundar Hi, I have a variable type which I'd like to use like so Sundar logic:iterate id=element collection=%= myVector % Sundar li html:link page=/action%= type %.do Sundar bean:write name=element / /html:link/li Sundar /logic:iterate Sundar But no matter what I try I don't seem to be able to get Sundar the link to do Sundar the right thing.. Ideas? Well, one problem is that if you use a scriptlet expression for a custom tag attribute, the expression scriptlet has to be the entire attribute value, not just a portion of it. You'll have to concatenate strings together. -- - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
struts 1.1 b2 messes up w/ CSS?
Hi, I have a web application that was working fine w/ struts 1.0. I updated to 1.1 (by update the tld's the jars etc.), and now the web pages that had css attributes just don't seem to work!!! Does 1.1. interfere w/ the the loading/reading of css attributes? Thanks. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: struts 1.1 b2 messes up w/ CSS?
Hi, David: Thanks for your notes. Sundar Does 1.1. interfere w/ the the loading/reading of css attributes? Sundar Thanks. You'll have to be much more specific, showing exactly what you mean by doesn't work, along with showing relevant portions of your pages, and the resulting output. What container and version are you using? Well I tracked it down to the foll. I don't quite understand why it happens, but at least I now have a workaround. The tool I'm using WSAD / eclipse generates struts pages with css like so: META http-equiv=Content-Type content=text/html; charset=ISO-8859-1 META name=GENERATOR content=IBM WebSphere Studio META http-equiv=Content-Style-Type content=text/css LINK href=/theme/tigris.css rel=stylesheet type=text/css TITLE/TITLE Now, I'd moved the jsp which had the above lines into a sub-directory called jsp (I now have tens of jsps and it was becoming unweildy to have them all at the same root level). The tool changed the lines to LINK href=../theme/tigris.css rel=stylesheet type=text/css That should work.. but go figure, it doesn't. I tried both 1.0 and 1.1b2 of struts. Now if I change it to LINK href=theme/tigris.css rel=stylesheet type=text/css it works again. When I say it doesn't work, it means that css styles are just silently ignored.. my output pages appear from the jsp, but it looks ugly :) Thanks for your time and help. ps. hmm.. I wonder if WSAD/Eclipse should be generating html:link in this case. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: question re. struts
- set each individual attribute of my model into request
parameters
Why would you do this if you have the form bean from the previous
step?
Hi, Paul: Thanks for your thoughtful reply. Your above statement is
what I guess I'm having trouble with. (i.e. if I have a Point model
object.. say read from the db.. according to a unique ID..
Point -- getX(), getY(), setX(int x), setY(int y) ..
now I need a
PointForm
with similar methods.. may be getting and setting with String instead
of ints :). and Let's postulate a PointAction.
The point of confusion I have is.. I understand that the struts
servlet instantiates PointAction, and can map parameter X, and Y from/to
PointForm's X and Y.. but in my perform method .. I still need to
have:
perform.. () {
Point p = new Point(id);
request.setAttribute(X, p.getX());
..
call the jsp
}
do I not?
What I would have liked to be able to do is..
class PointForm extends Point implements SomeStrutsFormInterface {
}
in cases where this is possible. The advantage of this is that it
still maintains and allows for the *Form classes to be decoupled from
the Model classes, but allows for code re-use.. I don't have to
write several lines of repeated code.. or just spend a lot of time
writeing to string and from string methods for every single
attribute. In a language such as Java where no pointers exist taking
the reflection overhead seems like a big waste -- and writing all
these repeated methods seems such a productivity reducer :)
Am I making sense?
If it does, what I'd like to know is what people do to reduce the
amount of code.. is there a tool that can perhaps 'generate' the form
given a model.. ? Or something.. I have tens of objects w/ hundreds of
attributes and I'm overwhelmed w/ the amount of code Struts seems to
imply.
Thanks.
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Re: question re. struts
You should really go back through some of the archives to review the pro and con arguments; and (among other things) you will find that I am adamantly against what you propose -- it would encourage people to reuse the wrong thing for the wrong reasons. Craig -- thanks for your response. Will go and read them, since this list seems like a really useful resource and undoubtedly people have run against this sort of issue before. But your suggestion doesn't help me.. because I am on 1.0 (I tried to go to 1.1b2 this afternoon and failed -- 1.1 seems like several jars -- 17M? yikes, and undoubtedly was interacting w/ some tomcat jars that I've yet to fully debug) and I think even though I may not have the right solution -- I think this remains a problem. So I guess it's back for me to try and put in the 1.1 stuff and give that a go again. Sigh. Thanks. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
what's the right syntax for logic:iterate
Hi, I have a variable type which I'd like to use like so logic:iterate id=element collection=%= myVector % li html:link page=/action%= type %.do bean:write name=element / /html:link/li /logic:iterate But no matter what I try I don't seem to be able to get the link to do the right thing.. Ideas? Thanks. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
semi-newbie questions re. struts
Hi, I was told that jsp-jsp through a href=foo.jsplink/a in an html file is not recommended struts practice. If this is not good.. and I can understand why.. I was told that replacing it with html:form action=/foo html:submit value=foo/html:submit /html:form was the way to go. However, form's submits appear as buttons and not as links. How do I get a link-like appearance within a form. I have looked at html:link but tools such as IBM's struts diagramming don't grok that so if form's are the recommended best practice here, how can I make a link appear inside of a form. BTW. if I use html:link is the struts controller invoked if I use the action attribute correctly? The reason I ask is that I tried that but my beans on my jsp are not getting populated correctly. Thanks in advance. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
proper use of back button -- design patterns
I notice that w/ the default configuration on most browsers is to ask the user wheter form data should be resent. I wonder if there are concise descriptions/tutorials on web application design that deal with somewhat (I expect :) thorny issue. Do people just set the pragmas for cache-control and forget about it, or .. In particular I wonder if there's any support in the struts framework for detecting disabling such traversals. Thanks. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
what does RT Expr mean
In the bottom of the documentation on the attributes of several tags I see [RT Expr].. what does that mean? Is it documented anywhere? Thanks. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: what does RT Expr mean
Thank you for all your replies. I had guessed RT Expr might mean that. But now for the follow up. As others have said, it means run-time expression. Specifically, it means the value CAN be specified by a JSP expression scriptlet (beginning with %=). Ironically, calling it a run-time expression I'm now confused. I've been able to previously put %= % in similar places in other JSP's that did not use the struts tags. Are you all telling me that there are now cases when certain tags are marked w/out RT Expr .. that these struts tags explicitly disallow me typing %= % in those attributes? If so that would be a step backward IMHO. Thanks. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
