Tcp+methode+error

السلام عليكــم ورحمـة الله وبركاتــه

عندما أعمل run لهدا الكود يطلع المشكل error

import java.net.*;
import java.io.*;
public class Tcp   {
	Bdd bdd=new Bdd();

  Tcp() {
  }  
void Tcp1()	
{
	int port=6080;
	ServerSocket server_socket;
	BufferedReader input;
	PrintWriter output;
	try {

		server_socket = new ServerSocket(port);
		System.out.println("Server waiting for client on port " + 
				   server_socket.getLocalPort());

		// server infinite loop
		while(true) {
		Socket socket = server_socket.accept();
		System.out.println("New connection accepted " +
				   socket.getInetAddress() +
				   ":" + socket.getPort());
		  input = new BufferedReader(new InputStreamReader(System.in)); 
				   output = new PrintWriter(socket.getOutputStream(),true);
// print received data 
		try {
			while(true) {
			String message = input.readLine();
					   // String d=message;
			//if (message==null) break;

						String nom="";
					  nom=bdd.Recherche(message);
			System.out.println(message);
					output.println(nom);

						}
			}
		catch (IOException e) { System.out.println(e); }
		try {
			socket.close();
			System.out.println("Connection closed by client");
			}
		catch (IOException e) { System.out.println(e); }

			}


	}

	catch (IOException e) {
		System.out.println(e);
	}
	}


public static void main (String []args)
{

 Tcp ss= new Tcp();
ss.Tcp1();	
}

}

والميثود Rechercher تنتمي الى class أخرى كودها كاتالي

public static String Rechercher(String nom) throws SQLException, ClassNotFoundException {

شكرااااااااااااااااااااااااااااااااااااااااوجزاكم الله خيراااااااااااااااااااااااااااااااااااااا