Share database connection between servlets

Question

hello,
i need help to know if the following code works well.
The intention is to share a unique JDBC database connection with all servlets of my application.
//************************ file Conexao.java ***********************
// this class makes a databse connection
import java.sql.*;
public class Conexao
Connection conex;
public void conecta()
try
Class.forName("interbase.interclient.Driver");
conex = DriverManager.getConnection("jdbc:interbase://localhost/c:\\temp\\Kuala.gdb","SYSDBA","masterkey");
catch(ClassNotFoundException ex) { }
catch(SQLException ex) { }
public void desconecta()
try
{ conex.close(); }
catch(SQLException ex) { }
//****************** file SetConnectionContext ****************
// this class creates an instance of Conexao class and invokes the
// conecta() method. After, obtain the ServletContext object and
// set the attribute "conecta" to the ServletContext
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
public class SetConnectionContext extends HttpServlet
Conexao connection = null;
public void init()
connection = new Conexao();
connection.conecta();
ServletContext context = getServletContext();
context.setAttribute("conecta", connection);
public void destroy()
{ connection.desconecta(); }
public void doGet (HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
response.setContentType("text/html");
PrintWriter saida = response.getWriter();
saida.println("<H1>objeto connection atribuido no contexto</H1>");
//****************** file GetConnectionContext.java ******************
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
public class GetConnectionContext extends HttpServlet
public void doGet (HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
response.setContentType("text/html");
PrintWriter saida = response.getWriter();
ServletContext context = getServletContext();
Conexao con = (Conexao) context.getAttribute("conecta");
try {
Statement comando = con.conex.createStatement();
ResultSet rs = comando.executeQuery("SELECT * FROM kl_campanha");
while( rs.next() )
int codCampanha = rs.getInt("codCampanha");
saida.println("<h3>"+codCampanha+"</h3>");
catch(Exception e) { }

Answer 1

I understand the use of a static variable.
But if i want to share a database connection object (a
instance varible instead of class variable) that is
instantiate once and saved in a ServletContext
attribute,
and afterwards the other servlets can get
the object through the ServletContext attribute and
use it. This will works well? i did tests with the
code and everything apparently works.
How does a new connection (different user) get the old context?