Не могу разобраться что не так я делаю с ClassLoader

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.ArrayList;
import java.util.List;
 
public class MyClassLoader extends ClassLoader {
    private String directory;
    private String extensionOfFile = ".class";
    private String[] nameOfFileStrings;
    private int index;
 
    @Override
    public String getPath() {
        return this.directory;
    }
 
    @Override
    public void setPath(String dir) {
        if (dir == null) {
            throw new NullPointerException();
        }
 
        try {
            this.directory = dir;
        } catch (Exception e) {
            e.printStackTrace();
        }
 
    }
 
    @Override
    protected Class<?> loadClass(String name, boolean resolve)
            throws ClassNotFoundException {
        Class<?> resultClass = findClass(name);
 
        if (resolve) {
            resolveClass(resultClass);
        }
 
        return resultClass;
    }
 
    @Override
    public Class<?> findClass(String name) throws ClassNotFoundException {
        byte[] temp;
 
        File file = new File(name);
 
        try {
            temp = loadFileAsBytes(file);
            return defineClass(name, temp, 0, temp.length);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        return null;
    }
 
    private byte[] loadFileAsBytes(File file) throws FileNotFoundException {
 
        byte[] result = new byte[(int) file.length()];
 
        FileInputStream fis = new FileInputStream(file);
 
        try {
            fis.read(result, 0, result.length);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                fis.close();
            } catch (Exception e) {
            }
        }
        return result;
    }
 
    // get 1 file's name from array of names
    public String getNameOfFile(String path) {
        nameOfFileStrings = findFiles(path, extensionOfFile);
        String nameString = "";
 
        if (index < nameOfFileStrings.length) {
            nameString = nameOfFileStrings[index++];
        } else {
            index = 0;
        }
 
        String[] wordsStrings = nameString.split("/");
        String nameString2 = wordsStrings[wordsStrings.length - 1];
        String[] nameString3 = nameString2.split("\\.");
        String nameOfOurFile = nameString3[0];
 
        return nameString;
    }
 
    // find all files in directory with extension which we want
    private String[] findFiles(String dir, String extension) {
        if (dir == null) {
            throw new NullPointerException();
        }
 
        if ("".equals(dir)) {
            throw new IllegalArgumentException();
        }
 
        if ("".equals(extension)) {
            String[] clearStringsArray = new String[0];
            return clearStringsArray;
        }
 
        MyFileVisitor myFileVisitor = new MyFileVisitor();
 
        try {
            Files.walkFileTree(Paths.get(dir), myFileVisitor);
        } catch (IOException e) {
            throw new IllegalArgumentException();
        }
 
        if (extension == null) {
            return myFileVisitor.arr;
        }
 
        List<String> defList = new ArrayList<String>();
 
        for (int i = 0; i < myFileVisitor.arr.length; i++) {
            if (myFileVisitor.arr[i].contains(extension)) {
                defList.add(myFileVisitor.arr[i]);
            }
        }
 
        String[] defStrings = new String[defList.size()];
        int k = 0;
 
        for (String str : defList) {
            defStrings[k++] = str;
        }
 
        return defStrings;
    }
 
    private class MyFileVisitor extends SimpleFileVisitor<Path> {
        java.util.List<String> filePaths = new ArrayList<String>();
        String arr[] = {};
 
        @Override
        public FileVisitResult visitFile(Path file, BasicFileAttributes attrs)
                throws IOException {
            {
                filePaths.add(file.toString());
 
                arr = new String[filePaths.size()];
 
                int k = 0;
 
                for (String str : filePaths) {
                    arr[k++] = str;
                }
 
                return FileVisitResult.CONTINUE;
            }
 
        }
    }
 
}

public class DemoLoader {
    public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException {
        String dirName = "/home/user/Documents/Test/";
        MyClassLoader myClassLoader = new MyClassLoader();
        myClassLoader.setPath(dirName);
        Class<?> clazz = myClassLoader.findClass(myClassLoader.getNameOfFile(myClassLoader.getPath()));
        Object object = clazz.newInstance();
        System.out.println(object);
    }
}

public class Test{
    public static void main(String[] args) {
        System.out.println("Hello world from the loaded class !!!");
    }
}

Exception in thread "main" java.lang.NoClassDefFoundError: IllegalName: /home/user/Documents/Test/Test.class
    at java.lang.ClassLoader.preDefineClass(ClassLoader.java:654)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:761)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:642)
    at laba8.MyClassLoader.findClass(MyClassLoader.java:63)
    at laba8.MyClassLoader.loadClass(MyClassLoader.java:46)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at laba8.DemoLoader.main(DemoLoader.java:8)

java.io.FileNotFoundException: Test (No such file or directory)
    at java.io.FileInputStream.open0(Native Method)
    at java.io.FileInputStream.open(FileInputStream.java:195)
    at java.io.FileInputStream.<init>(FileInputStream.java:138)
    at laba8.MyClassLoader.loadFileAsBytes(MyClassLoader.java:116)
    at laba8.MyClassLoader.findClass(MyClassLoader.java:62)
    at laba8.DemoLoader.main(DemoLoader.java:8)
Exception in thread "main" java.lang.NullPointerException
    at laba8.DemoLoader.main(DemoLoader.java:9)

ClassLoader.getSystemClassLoader().loadClass()....

import java.net.URL;
import java.net.URLClassLoader;
 
public class SergeyClassLoader extends URLClassLoader{
    
    public SergeyClassLoader(URL[] urls) {
        super(urls);
    }
    
}