クラスのロードが出来なくて困っています。。

gistfile1.java

package loaderClasses;

public interface LoadedClass {
    public void doIt();
}

gistfile2.java

package loaderClasses;

public class SpeciallyLoadedClass implements LoadedClass {
    public void doIt() {
	System.out.println("doIt: Hello from " + getClass().getName());
    }
}

 

gistfile3.java

// 
// This loader takes a name of a directory that names 
// location from which to load classes. 
//
// Classes are cached. When load is requested with loadClass method,
// cache is checked to see if it has been loaded.
//

import java.io.*;
import java.util.*;

public class SimpleLoader extends ClassLoader {
    private Hashtable _cache = new Hashtable();
    private String _pathBase;  // Directory containg class files

    public SimpleLoader(String base)
    {
        _pathBase = base;
    }

    protected Class loadClass(String name, boolean resolve)
			throws ClassNotFoundException
    {
        Class c;

	// Check class cache
        c = (Class) getCache().get(name);

	if (c == null) {
          //try {
          //  c = findSystemClass(name);
          //  return c;
          //} catch (Exception ClassNotFoundException) {

            try {
        	String fileName = getPathBase() + 
				System.getProperty("file.separator") + 
				dotToSlash(name) + ".class";
System.out.println("Class file: " + fileName);
                byte data[] = loadClassData(fileName);
System.out.println("File size: " + data.length);
                c = defineClass(name, data, 0, data.length);

		// Cache it...
                getCache().put(name, c);

            } catch (ClassFormatError e) {
		throw new ClassNotFoundException(name);
	    }
	  //}
	}

	// If we are really going to use class, resolve it!
        if (resolve) {
            resolveClass(c);
	}

        return c;
    }


    private byte loadClassData(String name)[]
    {
        File            file = new File(name);

        try {
            FileInputStream in = new FileInputStream(file);
            byte[] buf = new byte[(int)file.length()];
            in.read(buf, 0, (int)file.length());

            return buf;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
    
    public static String dotToSlash(String cname) {
        return cname.replace('.', 
		System.getProperty("file.separator").charAt(0));
    }

    protected String getPathBase() {
	return _pathBase;
    } 

    protected Hashtable getCache() {
	return _cache;
    }

}

gistfile4.java

import loaderClasses.*;

public class LoaderMain {

    public static void main(String[] args)
    {
	LoadedClass	lc;
        Class    	lcClass;

        SimpleLoader loader = new SimpleLoader(args[0]);

        try {
	    lcClass = loader.loadClass("loaderClasses.SpeciallyLoadedClass", true);
            System.err.println("loaded : " + lcClass);
            lc =  (LoadedClass) lcClass.newInstance();
	    lc.doIt();
            System.err.println("loaded : " + lc.getClass().getName());
	} catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException iae) {
            iae.printStackTrace();
        }
    }
}

gistfile5.txt

Class file: C:\\loaderClasses\SpeciallyLoadedClass.class
File size: 830
Class file: C:\\loaderClasses\LoadedClass.class
File size: 138
Class file: C:\\java\lang\Object.class
java.io.FileNotFoundException: C:\java\lang\Object.class (指定されたパスが見つかりません。)
	at java.io.FileInputStream.open(Native Method)
	at java.io.FileInputStream.<init>(FileInputStream.java:106)
	at SimpleLoader.loadClassData(SimpleLoader.java:67)
	at SimpleLoader.loadClass(SimpleLoader.java:40)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:466)
	at SimpleLoader.loadClass(SimpleLoader.java:42)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:466)
	at SimpleLoader.loadClass(SimpleLoader.java:42)
	at LoaderMain.main(LoaderMain.java:13)
Exception in thread "main" java.lang.NullPointerException
	at SimpleLoader.loadClass(SimpleLoader.java:41)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:466)
	at SimpleLoader.loadClass(SimpleLoader.java:42)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:466)
	at SimpleLoader.loadClass(SimpleLoader.java:42)
	at LoaderMain.main(LoaderMain.java:13)