Help Determining Which Methods/Classes Are Being Used

Hello,
I'm having issues with my company's Java application and because I've luckily narrowed the classes down to a meager 30+ I need some help pinpointing my problem.
I realize there are a lot of Java monitoring applets/applications and some are deployment-specific but I need something very detailed-- I haven't found the features I need.
Specs:
Jrun4, Java 1.4, Windows Server 2003
I would like to have a monitor that tells me exactly (real-time) what classes, methods, variables, etc. are being called in real-time. Looking at the JRun launcher console for one process gives me this:
Generating report:quadbase.reportdesigner.ReportAPI.QbReport with export type:PDF
01/16 14:05:33 error Software caused connection abort: socket write error
java.net.SocketException: Software caused connection abort: socket write error
        at java.net.SocketOutputStream.socketWrite0(Native Method)
        at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)
        at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
        at jrun.servlet.io.MetricsOutputStream.write(MetricsOutputStream.java:75)
        at java.io.BufferedOutputStream.write(BufferedOutputStream.java:106)
        at jrun.servlet.http.WebOutputStream.write(WebOutputStream.java:64)
        at jrun.servlet.file.FileServlet.pipeData(FileServlet.java:419)
        at jrun.servlet.file.FileServlet.service(FileServlet.java:254)
        at jrun.servlet.ServletInvoker.invoke(ServletInvoker.java:91)
        at jrun.servlet.JRunInvokerChain.invokeNext(JRunInvokerChain.java:42)This is cute, but not really helpful. I would like to determine what was passed to the process, from where and what went wrong.
For example,
Instead of this:
Generating report:quadbase.reportdesigner.ReportAPI.QbReport with export type:PDF
01/16 14:05:33 error Software caused connection abort: socket write errorI would get something like this:
Generating report:quadbase.reportdesigner.ReportAPI.QbReport with export type:PDF
        Page variables: test.jsp ($var1= "I'm"; $var2= "Going"; $var3="To"; $var4="Break"; $var5 = null)
        Calling: test2.jsp
        With: jrun.bin.db.foo.Bar();
01/16 14:05:33 error Software caused connection abort: socket write error
        Problem: $var5 = null;Sorry if I'm rambling, I just want to know what is where and who it's calling when it breaks. Then I could deduce which class, what variable, what page, etc. My application is very complicated and seemingly mundane changes can throw it all off.
Any ideas?

We'll look into usage tracking. We're on the standard edition, so I'm not sure if it's available. Also, some of these reports may be quarterly -- so there may be a long wait to see if the view is used and I need to know fairly soon. (If it's not used, it saves us some work in a project transition going on.)
I certainly don't understand the underlying structure of the product, but it seems like there should be some way to determine if a view is used by a report. I apologize if I'm not using the correct terminology. Thanks for your help -- we'll keep looking into it.

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Thanks in advance,
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