Help Problem Code Method Getprotectiondomain

helpme code in java base l2f

import l2f.gameserver.utils.VgConfig;
import l2f.commons.util.Base64;
import l2f.commons.crypt.NewCrypt;
import java.io.*;
import java.net.URL;
import java.net.URLConnection;
import java.security.CodeSource;
import java.security.ProtectionDomain;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

public Class forName(String className)
    {
        String classFile;
        ZipFile z;
        Enumeration list;
        if(VgConfig.NPROTECT_KEY == -1)
            throw new Exception();
        classFile = className.replace(".", "/");
        z = new ZipFile(VLoaderKey.getProtectionDomain().getCodeSource().getLocation().toURI());
        list = z.entries();
        byte data[];
        ZipEntry ze;
        do
        {
            if(!list.hasMoreElements())
            ze = (ZipEntry)list.nextElement();
        } while(!ze.getName().startsWith(classFile));
        InputStream is = z.getInputStream(ze);
        data = new byte[(int)ze.getSize()];
        is.read(data);
        is.close();
        if(data[0] != -54 || data[1] != -2)
        {
            NewCrypt nc = new NewCrypt(String.format("%X", new Object[] {
                Integer.valueOf(VgConfig.NPROTECT_KEY)
            }));
            data = nc.decrypt(data);
        }
        try
        {
            Class result = defineClass(className, data, 0, data.length);
            z.close();
            return result;
        }
        catch(ClassFormatError e)
        {
            System.out.println(" - Fxn 64 Protect: Unable to load protection components");
        }
        z.close();
        System.exit(0);
        return null;
        throw new Exception();
        Exception e;
        
        System.out.println("WARNING: Unable to load protection components");
        System.exit(0);
        return null;
    }

erro compile

compile:
    [javac] \java\l2f\gameserver\utils\VLoaderKey.java:91: error: cannot find symbol
    [javac]         z = new ZipFile(VLoaderKey.getProtectionDomain().getCodeSource().getLocation().toURI());
    [javac]                                   ^
    [javac]   symbol:   method getProtectionDomain()
    [javac]   location: class VLoaderKey

    [javac] \java\l2f\gameserver\utils\VLoaderRev.java:112: error: cannot find symbol
    [javac]             Class result = defineClass(className, data, 0, data.length);
    [javac]                            ^
    [javac]   symbol:   method defineClass(String,byte[],int,int)
    [javac]   location: class VLoaderRev