How to configure eclipse and tomcat to run remote debugging:

Check this link: http://wiki.apache.org/tomcat/FAQ/Developing and this link
http://it.newinstance.it/2005/10/04/remote-debugging-tomcat-with-eclipse/

http://confluence.sakaiproject.org/display/BOOT/Setting+Up+Tomcat+For+Remote+Debugging


1)open catalina.bat and add the following lines :
set JPDA_TRANSPORT=dt_socket
set JPDA_ADDRESS=7945
Now stop tomcat from the services window if you have it installed as a service. Then run the following from a console:

[path to tomcat]\bin>catalina jpda start

In eclipse press Run->Debug Configurations..->Remote Java Application->press new button(on top)->
select the project : moodle-transfer -> enter as port : 7945 -> press Debug.
Now run the application in a browser after you have set a breakpoint in the source code,
then eclipse should propose you to turn to debug perspective, choose yes, then you should begin the debugging.
Note: if you get the following error: failed to connect to remote vm. connection refused. connection refused connect eclipse
then change the port number because it may be used by another application.