Utility class for building class loaders for Catalina. The factory method requires the following parameters in order to build a new class loader (with suitable defaults in all cases):

• A set of directories containing unpacked classes (and resources) that should be included in the class loader's repositories.
• A set of directories containing classes and resources in JAR files. Each readable JAR file discovered in these directories will be added to the class loader's repositories.
• ClassLoader instance that should become the parent of the new class loader.