jdbc 连接sqlserver2008 登录失败 连不上数据库

package common;

import java.sql.*;

public class DBUtil
{
private static String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";

private static String url = "jdbc:sqlserver://127.0.0.1:1433;DatabaseName=BookShop";

private static String userId = "sa";

private static String password = "sa";

private static Connection con = null;

private static Statement stmt = null;

private static ResultSet rs = null;



  public static int ExecuteUpdate(String sql) throws Exception
  {
  int rows = 0;

  try
  {
  Class.forName(driverName);

  con = DriverManager.getConnection(url, "sa", "sa");

  stmt = con.createStatement();

  rows = stmt.executeUpdate(sql);
  }
  catch(Exception ex)
  {
  System.out.print(ex.getMessage());
  }

  return rows;
  }

  public static ResultSet ExecuteQuery(String sql) throws Exception
  {
   

  try 
  {
  Class.forName(driverName).newInstance();

  con = DriverManager.getConnection(url, "sa", "sa");

  stmt = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);

  rs = stmt.executeQuery(sql);
  }
  catch(Exception ex)
  {
  System.out.print(ex.getMessage());
  }

  return rs;
  }
}



上面是部分代码 
 我的其他工程连接数据库是能连接上的 同样是jdbc 连接的用户也是一样的

这个工程我找不出错 但是连接不上数据库 


------解决方案--------------------
把上述代码执行的日志信息贴出来
------解决方案--------------------
贴异常信息