Design procedure for mapping Tomcat-compiled JSP to their source

The compilation process with Tomcat/Jasper is:
- a jsp is compiled/transpiled to a .java file
- the .java is compiled to a .class
- there is a possible "source-classes-mapping.txt" file that may exists in some cases. Not clear which tool builds this, possibly javac. This maps a generated .java file to a compiled .class file "org/apache/jsp/my_jsp.java
 org.apache.jsp.my_jsp" 