I am using Eclipse 3.5 and the Tomcat 6 and Weblogic 11g.
I download the Oracle Eclipse Plugin "//download.oracle.com/otn_software/oepe/galileo". When I debug the jsp with ecliipse and Tomcat 6, it gives me the error "Source not found". It cannot find the jsp but it gives me the line number it is on in the jsp. Also in debug mode, under Variables tab, it shows the list of variables and their value. I started Tomcat6 within Eclipse.
I have the same problem with Eclipse 3.5 and Weblogic 11g. I started Weblogic 11g within Eclipse.