System classloaders are provided to Tomcat as JAR files... You may want to unjar them to see the classes inside them... And if the source codes are not available in the JAR files, you might want to use decompiler to decompiler them into
Java source files...
BTW, may I know what you want to do with the system class loaders?
No one wants to dig into Tomcat internal class loaders like this... People just use them as they are in Tomcat...
Co-author of SCMAD Exam Guide, Author of JMADPlus
SCJP1.2, CCNA, SCWCD1.4, SCBCD1.3, SCMAD1.0, SCJA1.0, SCJP6.0