I cover the basics of
Java Class Loaders and how they relate to
J2EE Class Loaders. Then, I get into some detail about the JBoss Class Loaders.
But the most important thing I cover is how to avoid Class Loader issues in your code, and how to choose the correct Class Loader. The Logging Appendix shows how to use the correct Class Loader to find/load a Properties file that's packaged in your EAR/WAR/JAR deployment.
Tom