problems with connection to mysql database

When i try to execute the ListProdQty method it jumps from that method to the catch in the connecttodatabase method and gives me a java.lang.NullPointerException

Code :

public void ConnectToDatabase()
{
    try
    {
    String user, pass, host;
    user = readEntry("Please enter User ID  : ");
    pass = readEntry("Please enter Password : ");
    host = readEntry("Please enter Hostname : ");
   // database = readEntry("Please enter database name: ");
    //  userid, password and hostname are obtained from the console
 
    Connection conn = DriverManager.getConnection
	              ("jdbc:mysql://localhost:3306/oncs", user, pass);
 
    /* JDBC default is to commit each SQL statement as it is sent to the database.  Setting autocommmit=false changes the default
       behaviour so that transactions have to be committed explicity.
     */
    conn.setAutoCommit(false);
    MenuMain();
    }
    catch(Exception ex)
    {
    	System.out.println(ex);
    }
  } 
 
 
 
 
 
private void ListProdQty()
    {
    try
    	{
    	// Creates a statement and a result set to execute the sql query.
			s = conn.createStatement();
			resultSet = s.executeQuery("SELECT pname FROM product"+
				"WHERE pqtyinstock >5"+
					" AND pretailprice > 150"+
						"ORDER BY pname");
 
			//Creates a loop to loop through the result set
			while(resultSet.next()) 
      {
      	//Prints the results to the user
	 		  System.out.println(resultSet.getString(1));
      }
      //Commits the connection to the database
      conn.commit();
 
    	}
    	catch(SQLException excep)
    	{
    		//Prints an error message to the user
    		System.out.println(excep);
    	}
    }