public static  void main(String[] args) 
{
    // ----------------------------------------------------------- Main Program
        // Verify that "catalina.home" was passed.
        if (catalinaHome == null) {
            log.error("Must set 'catalina.home' system property");
            System.exit(1);
        }
        // Process command line options
        int index = 0;
        while (true) {
            if (index == args.length) {
                usage();
                System.exit(1);
            }
            if ("-ant".equals(args[index]))
                ant = true;
            else if ("-common".equals(args[index]))
                common = true;
            else if ("-server".equals(args[index]))
                server = true;
            else if ("-shared".equals(args[index]))
                shared = true;
            else
                break;
            index++;
        }
        if (index  > args.length) {
            usage();
            System.exit(1);
        }
        // Set "ant.home" if requested
        if (ant)
            System.setProperty("ant.home", catalinaHome);
        // Construct the class loader we will be using
        ClassLoader classLoader = null;
        try {
            ArrayList packed = new ArrayList();
            ArrayList unpacked = new ArrayList();
            unpacked.add(new File(catalinaHome, "classes"));
            packed.add(new File(catalinaHome, "lib"));
            if (common) {
                unpacked.add(new File(catalinaHome,
                                      "common" + File.separator + "classes"));
                packed.add(new File(catalinaHome,
                                    "common" + File.separator + "lib"));
            }
            if (server) {
                unpacked.add(new File(catalinaHome,
                                      "server" + File.separator + "classes"));
                packed.add(new File(catalinaHome,
                                    "server" + File.separator + "lib"));
            }
            if (shared) {
                unpacked.add(new File(catalinaHome,
                                      "shared" + File.separator + "classes"));
                packed.add(new File(catalinaHome,
                                    "shared" + File.separator + "lib"));
            }
            classLoader =
                ClassLoaderFactory.createClassLoader
                ((File[]) unpacked.toArray(new File[0]),
                 (File[]) packed.toArray(new File[0]),
                 null);
        } catch (Throwable t) {
            log.error("Class loader creation threw exception", t);
            System.exit(1);
        }
        Thread.currentThread().setContextClassLoader(classLoader);
        // Load our application class
        Class clazz = null;
        String className = args[index++];
        try {
            if (log.isDebugEnabled())
                log.debug("Loading application class " + className);
            clazz = classLoader.loadClass(className);
        } catch (Throwable t) {
            log.error("Exception creating instance of " + className, t);
            System.exit(1);
        }
        // Locate the static main() method of the application class
        Method method = null;
        String params[] = new String[args.length - index];
        System.arraycopy(args, index, params, 0, params.length);
        try {
            if (log.isDebugEnabled())
                log.debug("Identifying main() method");
            String methodName = "main";
            Class paramTypes[] = new Class[1];
            paramTypes[0] = params.getClass();
            method = clazz.getMethod(methodName, paramTypes);
        } catch (Throwable t) {
            log.error("Exception locating main() method", t);
            System.exit(1);
        }
        // Invoke the main method of the application class
        try {
            if (log.isDebugEnabled())
                log.debug("Calling main() method");
            Object paramValues[] = new Object[1];
            paramValues[0] = params;
            method.invoke(null, paramValues);
        } catch (Throwable t) {
            log.error("Exception calling main() method", t);
            System.exit(1);
        }
}

The main program for the bootstrap.