wyciek pamieci ciag dalszy :/ gdzie lezy problem?

Witam

mam duzy problem z optymalizacja aplikacji caly czas gdzies wycieka pamiec a ja nie jestem w stanie stwierdzic co jest problemem

http://wgrajfoto.pl/pokaz/img0610/aaadc52.jpg

http://wgrajfoto.pl/pokaz/img0610/pamiec3d05.jpg

Zrobilem program testowy by przesledzic co moze byc nie tak program wysyla 80 wiadomosci co sekunde i zaczolem dokladac metody i testowac czy pamiec nie zaczyna sie rozrastac no i problem sie pojawil jak dodalem metode ktora komunikuje sie z baza. sama metoda jest dobrze napisana bo zapetlilem ja na 100000 zapytan i pamiec nic nie nabral na objetosci. Program dobrze dziala jesli jest 1-2 klijenow uruchomiony ale jesli podlacze wiecej to zaczyna nabierac, nie mam pojecia gdzie tu szukac rozwiazania?

import java.util.Random;
import java.util.TimerTask;

public class CC_timer extends TimerTask {
  public static String s=C_start.s;

public void run()
{
         System.out.println("Wysylam 80 losowych wiadomosci");
         for (int yy=1;yy<=80;yy++) {
           Random a = new Random();
           StringBuilder temp = new StringBuilder();
           for (int xx=1;xx<=70;xx++) {
              temp.append(a.nextInt(700));
              temp.append(s);
           }
           C_start.wys.wyslij(temp.toString());
         }
}
}

import java.io.IOException;
import java.nio.BufferUnderflowException;
import org.xsocket.MaxReadSizeExceededException;
import org.xsocket.connection.IDataHandler;
import org.xsocket.connection.INonBlockingConnection;

public class C_echo {
   static IDataHandler clientHandler = null;
   public static String s=C_start.s;
   public static String k=C_start.k;

public static void Start() {
    try {clientHandler = new IDataHandler() {
         public boolean onData(INonBlockingConnection nbc)  throws IOException, BufferUnderflowException, MaxReadSizeExceededException {


             return true;
         }
    };
  }catch(Exception e){}
}
}

public class C_send {
    public static String s=C_start.s;
    public static String k=C_start.k;
    synchronized public void wyslij(String co) {
         try {
             C_start.nbc.write( "0"+s+"0"+s+"test4"+s+"Af561aaf6ef0bf14d4208bb46a4ccb3ad"+s+ co +k );

         }  catch (Exception ex) {}
    }
}

import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Timer;
import javax.swing.JApplet;
import org.xsocket.connection.INonBlockingConnection;
import org.xsocket.connection.NonBlockingConnection;

public class C_start extends JApplet {
  public static String s="+"; //SEPARATOR alt 193
  public static String k="T"; //SEPARATOR KONCA PAKIETU alt 194
  public static Timer timer1;
  public static InetAddress inetAddress=null;
  public static INonBlockingConnection nbc=null;
  public static C_send wys = new C_send();

  public void start(){
     START();
     timer1 = new Timer();  CC_timer timer1_task = new CC_timer();  timer1.schedule (timer1_task, 0, 1500);
  }

public static void START(){
            try { inetAddress = InetAddress.getByName("82.139.61.105");
                 try {  nbc = new NonBlockingConnection(inetAddress, 8090, C_echo.clientHandler);   } catch (IOException e) {e.printStackTrace();}
                       System.out.println("--------------------------------------------------------");
                       System.out.println("|           Client START!                              |");
                       System.out.println("--------------------------------------------------------");
            } catch (UnknownHostException e) {e.printStackTrace();}
            try {
            } catch (Exception e) {e.printStackTrace();}
            wys.wyslij("PROBA ZALOGOWANIA");
}
public static void STOP(){
    try {  if (nbc!=null) { nbc.flush();   } //else {System.out.println("STOP !flush");}
          if (nbc!=null) { nbc.close();   } //else {System.out.println("STOP !close");}
    } catch (IOException e) {e.printStackTrace();}
}

}

import java.sql.*;

public class SS_BAZA_mysql extends Thread {
    SS_BAZA_mysql(){
      try {
        Class.forName("com.mysql.jdbc.Driver");
        con = DriverManager.getConnection(url+db,login, haslo);
        stmt = con.createStatement();
      } catch( Exception e ) {e.printStackTrace(); }
    }
    Connection con;
    Statement stmt;
String url ="jdbc:mysql://localhost:3306/";
public String db="baza"; 
String login = "root";
String haslo = "haslo";

public int sprawdzamv2(String L, String H){
  int flaga=0;
  PreparedStatement ps = null;
  ResultSet rs = null;
    try {
          String query = "SELECT * FROM "+db+".tabelka WHERE login='"+L+"';";
          //SELECT * FROM table WHERE id='$random_id'
          System.out.println("query ="+query);
          ps = con.prepareStatement(query);
          rs = ps.executeQuery(); // po dodaniu tej lini program zaczyna nabierac duzo na pamieci
//          while (rs.next()) {
//            String n1 = rs.getString("login");
//            String n2 = rs.getString("password");
//            String n3 = rs.getString("serv");
//             if (n3.equals("0")) {
//
//                if (n2.equals(H) && n1.equals(L)) {System.out.println("L == H ");
//                  flaga=1;
//                  stmt.executeUpdate("UPDATE tabelka SET serv='"+1+"' WHERE login='"+L+"';  ");
//                } else {System.out.println("sprawdzam: L != H ");}
//
//             } else { System.out.println("N3!=0 ---> "+L+" jest na innym serwerze");}
//
//          }
       rs.close();
       ps.close();
     }catch( Exception e ) { e.printStackTrace(); }
     finally {
        if (rs!=null) {
                try {
                    rs.close();
                } catch (SQLException ex) {
                    ex.printStackTrace();
                }
                rs = null;
        }
        if (ps!=null) {
                try {
                    ps.close();
                } catch (SQLException ex) {
                    ex.printStackTrace();
                }
                ps = null;
        }
     }
  return flaga;
}
}

import java.io.IOException;
import java.nio.BufferUnderflowException;
import org.xsocket.MaxReadSizeExceededException;
import org.xsocket.connection.INonBlockingConnection;
import org.xsocket.connection.IDataHandler;

public class S_echo implements IDataHandler {
 public static String s=S_start.s; //SEPARATOR alt 193
 public static String k=S_start.k; //SEPARATOR KONCA PAKIETU alt 194

  public boolean onData(INonBlockingConnection nbc)  throws IOException, BufferUnderflowException, MaxReadSizeExceededException {
     String wiadomosc = nbc.readStringByDelimiter(k);
     System.out.println("wiadomosc = " +wiadomosc);
     String stab[]=null;
     stab = wiadomosc.split(s);
     if (S_start.baza.sprawdzamv2(stab[2],stab[3])==1) {}
     return true;
  }
}

import org.xsocket.connection.IServer;
import org.xsocket.connection.Server;

public class S_start  {
  public static String s="+"; //SEPARATOR alt 193
  public static String k="T"; //SEPARATOR KONCA PAKIETU alt 194
  public static SS_BAZA_mysql baza = new SS_BAZA_mysql();

public static void main(String [] args) {

try{ System.out.println("--------------------------------------------------------");
       System.out.println("|           Serwer                                                 ");
       System.out.println("--------------------------------------------------------");
       IServer srv = new Server(8090, new S_echo());
  srv.run(); srv.start(); }catch(Exception e){ e.printStackTrace();}
}
}

Ten plik obrazuje ze sama funkcja działa dobrze i program nie nabiera na pamieci

import javax.swing.JApplet;

public class petla extends JApplet{
  public static SS_BAZA_mysql baza = new SS_BAZA_mysql();

    @Override public void start(){
        System.out.println("start");

        for (int xx=1;xx<=100000;xx++) {
            System.out.println("xx"+xx);
            if (baza.sprawdzamv2("5","5")==1) {                 
            }
        }

    }
}

dolaczam kod z bibliotekami:
http://mgs_saladin.republika.pl/wyciekPamieci.zip