Re: question for filedownload jsp with commandLink and commandButton

[Yasushi Okubo]

I installed ftrace, but I do not see any errors from output, it only gave a waring message since the page was directed to jsp page.

Could you explain to me what you are achieved using AspectJ a little more ?   I am not sure what you are trying to do here by just looking at the link: eclipse/aspectj and its brief tutorial.
What are aspected myfaces classes and where I can find those. how can I use  ?

Thanks,
yasushi

James Richards wrote:

The example I gave was very specific to the application I was working on.  Have you tried plugging in the FacesTrace from http://facestrace.sourceforge.net/ onto the view in question?  Someone from the list pointed me to it and it helps to follow what's happening.  If you plug it into the page that's failing, you may see that it's failing in a particular phase, say applying model updates, and that will target your search.

MyFaces has proven fairly complex to debug so I've actually been compiling a trace into MyFaces using AspectJ.  I copy the aspected MyFaces classes into my WEB-INF/classes directory.  This lets me, for example, follow exactly what LifecycleImpl is doing.

AspectJ is from eclipse.org/aspectj

Hope that helps,

James


-----Original Message-----
From: Yasushi Okubo [mailto:[EMAIL PROTECTED]]
Sent: Tue 5/30/2006 11:15 AM
To: MyFaces Discussion
Subject: Re: question for filedownload jsp with commandLink and commandButton
 
Hi, James

Thanks for the info, but I do not see any code fragment for 
renderResponse inside my code.  I am using myface 1.1.1, is this a 
generic issue on myfaces 1.1.1 ?

Thanks,
yasushi

James Richards wrote:

  

I ran into something along these lines recently.  In my case, there was a managed bean with a 

public void changeSpecifiedRole(ValueChangeEvent event)

method being called by MyFaces after the first button press which was erroneously [for that version of MyFaces] invoking "renderResponse()".  

Perhaps you have a similar listener which explictly calls renderResponse?

Hope that helps,

James
 


-----Original Message-----
From: Yasushi Okubo [mailto:[EMAIL PROTECTED]]
Sent: Tue 5/30/2006 10:01 AM
To: MyFaces Discussion
Subject: question for filedownload jsp with commandLink and commandButton

Hi experts,

I have multiple download links [commandLink] /buttons[commandButton] on 
the same page.  I realized that a user needs to click twice to see an 
open directory window from the second attempt, I do not understand why 
this is happening.

The download page was implemented with jsp page. 
commandLink/commandbutton  are simply taking  a user to this download 
page by clicking a link or a button.

At the first click, a use always go to this page and the browser asks a 
user if one wants to save a directory or open on the browser. Then a 
user can decide to cancel or save or open. 
At the second attempts, the problem is that a user clicks link/button 
subsequently right after the first attempt, the action does not take a 
user to the jsp page, and it only reloads page with a round trip.
Then a user needs to click a link/ a button  second time, then it works.

Could someone advise me why this is happening and is there anyway to 
stop this ?

I implemented a commandbutton + actionListener [in backing bean] 
solution for file download, but the result was the same.  From the 
second attempt, a user always needs to click twice [double click] button.
I saw the one post on google is that adding _blank on form tag helps, 
but it actually did not help at all.

Any idea ?

yasushi


==== partial code for jsp page ====
....

if(allowCache == null || allowCache.equalsIgnoreCase("false"))
   {
       response.setHeader("pragma", "no-cache");
       response.setHeader("Cache-control", "no-cache, no-store, 
must-revalidate");
       response.setHeader("Expires", "01 Apr 1995 01:10:10 GMT");
       response.addHeader("Cache-Control", "post-check=0, pre-check=0");
       response.setDateHeader ("Expires", 0);
   }

   if(contentType!=null)
   {
       response.setContentType(contentType);
   }

   if(fileName != null)
   {

       StringBuffer contentDisposition = new StringBuffer();

       if("true".equals(openDirectly))
       {
           contentDisposition.append("attachment;");
            logger.info("==> attachement");
       }

       contentDisposition.append("filename=\"");
       contentDisposition.append(fileName);
       contentDisposition.append("\"");

       response.setHeader ("Content-Disposition", 
contentDisposition.toString());
   }

   if (bytes != null)
   {
       response.getOutputStream().write(bytes);
   }