Trace through a web application

Hello ...
 I am a Bioinformatist new to Java Technologies but fair knowledge in other lang.
(Perl,C and CGI scripting)

Our lab is using an application that is deployed on a J2EE app server(TomCat) and primarily uses JSP and servlets with a db that is Oracle ...

In order to understand the application I wish to "trace" through the applictaion.I have the source for the application.But I am not sure if
I can trace through a web based application as I do for a non -web based application.

Thanks for your time.
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

If you run it in an IDE like JBuilder, then yes you can step through it in exactly the same way...

You *can* put debug (System.out.println) lines in too, and see what comes out of catclina.out (in the logs dir of tomcat)

Is there a framework in use?  (Struts, Tapestry, etc)?

If so, there will be XML config files inside WEB-INF of the web application which should show you how a URL maps to a piece of code...

There is Eclipse as well ( which is another IDE (but free), and that allows you to trace through JSPs as well (I believe) though I have never tried it...

micro_learnerAuthor Commented:
Thanks for the reply ..I have Netbeans installed ...can I do with this.

Also Here they use "Castor" to retreve ..

Also could you direct me to a quick tutorial ...or something similar so that I can get the rudiments needed quickly
Yeah, you should be able to...

Hmmmm...never used Castor... It's a JDO thing (so it saves Java objects into the database without you having to do too much) I believe :-)

but I have to go home now...

I'll have a look tomorrow if no-one else has jumped in with more help :-)

You can use remote debbuging as following:

1- open the batch that starts tomcat and add this line before the line to execute the JVM (Command Prompet>java ........ ) :

set JAVA_VM=-Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,address=7777,server=y,suspend=n

then modify the line initiate the Tomcat Java process to be from

java ......

to be java %JAVA_VM% ...............

2- from netbeans configure remote debbuging

debug --> start session ---> attach specify that the socket connector is socket attach and specify the host name to the tomcat server and the port will be 7777

3- But ur break points in the application code and then run the application on tomcat it suppose to stop at break points and trace

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.