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From "Himstedt, Maik" <>
Subject Need help debugging Struts application
Date Fri, 02 Feb 2007 15:24:27 GMT

I'm experiencing something wierd with the Struts application I'm tasked to
take care off. The Struts version in use is 1.2.4, I use Eclipse 3.2.1 with
a few plugins (StrutsIDE might be iof interest here) for developing. The
application is hosted by Tomcat 5.0.29 locally during development and by
Websphere 6.0 in production. The problem described below happens regardless
of the server.

We have a JSP to show something like a tree structure to the user: the user
is presented a "list" with the tree's root at the top followed by the
children. The JSP walks through a list with <c:foreach> and prints out the
elements. Internally, this list is generated by a DB access and some sorting
to get it properly ordered (the root is the first element, followed by a
child with it's possible children etc. (a "drawing" is at the end of the

The problem now occuring is: a single children is listed twice (I can see it
in the generated page's source). I checked the internal list generated to
see if the element exists twice there as well before the list is put into
the request, but it doesn't, there is only one occurence of it.

Now, is there a way to debug the things happening between the forwarding and
the finished output? I set a breakpoint in the JSP for the output page and
it stops there without showing the source. I can access the variable,
though, and I can see that the list has TWO occurences now. Any ideas what
could cause this or how I can locate the problem?

The list:

 -B <- this is the duplicate of the one directly above

Thanks for your time,


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