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From Mike Douglass <dou...@rpi.edu>
Subject portal-struts bridge problems
Date Thu, 24 Feb 2005 20:43:25 GMT
I've been working to turn some struts application into portlets using 
the jetspeed2 portal-struts bridge.

I've run into a couple of problems, one of which I managed to work 
around, the other is more difficult.

First the applications are a suite of struts applications, the uw 
calendar in fact,

an admin tool - just struts and jsp
two user clients, identical except one is authenticated for personal 
events, one unauthenticated for public events.

The user clients use the struts framework and jsp to generate xml and 
use an xslt filter to generate ical, html whatever - but normally html.

All work standalone.

Problem 1.
In the bridge the admin client eventually worked. The user clients would 
not work until I appended

<% pageContext.getOut().flush(); %>

to the jsp. The behaviour I was seeing was either no data or 8k of 
truncated data - 8k being the default buffer size for the page context.

It's a relatively trivial problem but I guess the servlet container 
flushes before returning to the filter.

After that each application works by itself in the portal.

Problem 2.
More difficult. Because these use a common framework, there are a number 
of session attributes with the same name. The attributes for each 
application collide.

I tried various work rounds but none are succesful for one reason or 

I assume that the attributes sould really be stored in the PORTLET_SCOPE 
(PLT.15.3) but I'm not sure how to make that work in the bridge.

I did try adding a filter which wrapped the HttpSession and prefixed the 
attribute names. This failed very rapidly as the TagUtil class uses the 
pageContext to locate attributes and I suspect that is set up before the 
filter so it was looking for the unprefixed name.

Is there any way I can work round this?


Mike Douglass                           douglm@rpi.edu
Senior Systems Programmer
Communication & Collaboration Technologies      518 276 6780(voice) 2809
Rensselaer Polytechnic Institute 110 8th Street, Troy, NY 12180

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