Połączenie z baza

witam. chce sie połączyć z baza danych za pomoca javy. baza jest w postgresql. pokazuje mi taki błąd:

type Status report
message /pjojekt/DataBase
description The requested resource (/pjojekt/DataBase) is not available.

A tu mój kod do połączenia. co jest nie tak?

import java.sql.*;

public class DataBase
{

public static void main( String[] args ) {
try {
String url = "jdbc:postgresql://localhost/pjojekt";
String user = "postgres";
String password = "13757";

     Class.forName( "org.postgresql.Driver" );
     Connection conn = DriverManager.getConnection( url, user, password );
     Statement stmt = conn.createStatement();
     ResultSet rs = stmt.executeQuery( "SELECT * from materialy" );
     while ( rs.next() ) {
        System.out.println( rs.getString( "materialy" ) );
     }
     rs.close();
  } catch ( Exception e ) {
      e.printStackTrace();
  }

}
}

Nawza bazy to "pjojekt" czy mialo byc "projekt"?

:: napisał(a)

Nawza bazy to "pjojekt" czy mialo byc "projekt"?

miało byc pjojekt

A jestes pewny ze taka baza istnieje? W ogole to pokaz caly stack trace a nie tylko fragmenty bledu.

baza na pewno istnieje! poniewaz łącze sie z nia za pomoca servletów, (troche inny przykład ale za pomoca tego servleta łącze sie z bazą)to jest ich kod:

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class materialy2 extends HttpServlet {
    private static final long serialVersionUID = 1L;
    public materialy2() {
        super();
    }
    protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws IOException, ClassNotFoundException{
        materialy m = new materialy();
    	PrintWriter out = response.getWriter();
        m.connection();
	out.println(m.get());
	m.close();
    }
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        try {
            processRequest(request, response);
        }
        catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        try {
            processRequest(request, response);
        }
        catch (ClassNotFoundException e) {
            e.printStackTrace();
	}
    }
}

import java.sql.*;

public class materialy {

	private String url;
	private String usrname;
	private String pass;
	private Connection conn;
	private Statement stmt;
        private ResultSet rset;

        //konstruktor klasy poloczenie
    public materialy(){
    	this.url = "jdbc:postgresql://localhost/pjojekt";
    	this.usrname = "postgres";
    	this.pass = "13757";
    }

    //poloczenie do bazy
    public void connection() throws ClassNotFoundException{
    	try {
    		Class.forName( "org.postgresql.Driver" );
    		Driver d = new org.postgresql.Driver();
    		DriverManager.registerDriver(d);
	        conn = DriverManager.getConnection(this.url,this.usrname, this.pass);
	        if (conn != null)
                    System.out.println("Connecting!");
		else
                    System.out.println("We should never get here.");
    	}catch(Exception ex){
    		ex.printStackTrace();
    	}
    }

    public String get(){
	StringBuffer sb =  new StringBuffer();
	try {
            if(conn!=null){
                stmt = conn.createStatement();
                rset = stmt.executeQuery("select * FROM materialy");

                sb.append("<center><table border ='1'>");
                sb.append("<center>Przeglad materialow<tr><center><td>Id_mat</td><td><center>Nazwa_materialu</center></td><td>Cena</td></center></tr>");
            while(rset.next()){

                sb.append("<tr><td>"+rset.getObject(1)+"</td><td>"+rset.getObject(2)+"</td><td>"+rset.getObject(3)+"</td></tr>");
                System.out.println(rset.getObject(1)+ " \t"+rset.getObject(2)+"\t"+rset.getObject(3)+"\t");
                }
                rset.close();
                sb.append("</table></center>");
            }
	}
        catch(SQLException ex){
            ex.printStackTrace();
	}
        return sb.toString();
    }
    public void close (){
	try{
            if(conn!=null){
		this.conn.close();
		}
	}
        catch(SQLException ex){
            ex.printStackTrace();
	}
    }
}