import java.io.PrintStream;
import weblogic.security.internal.*;
import weblogic.security.internal.encryption.*;

public class Decrypt
{
    static EncryptionService es = null;
    static ClearOrEncryptedService ces = null;
    public static void main(String args[])
    {
        String s = null;
        if(args.length == 0)
            s = ServerAuthenticate.promptValue("Password: ", false);
        else
        if(args.length == 1)
            s = args[0];
        else
            System.err.println("Usage: java Decrypt [ password ]");
        es = SerializedSystemIni.getExistingEncryptionService();
        if(es == null)
        {
            System.err.println("Unable to initialize encryption service");
            return;
        }
        ces = new ClearOrEncryptedService(es);
        if(s != null)
            System.out.println("\nDecrypted Password is:"+ces.decrypt(s));
    }
}

Decrypt.java