This invention describes a system and method for monitoring the execution of hybrid source code such as JavaServer Pages (JSP) code. The system comprises a page compiler, which is called by a server for translating JSP code into a servlet for execution by the server. The page compiler during translation of the JSP code inserts instrumentation in the compiled JSP code for supporting execution tracing by an execution monitor. The execution monitor receives outputs from the page compiler, the servlet and the raw JSP code for displaying selected information about the execution of the JSP code to the developer on a graphical user interface. The execution monitor thus allows the developer to view the correlation between the JSP code, the servlet code and the HTML code that is generated by the servlet.