从jsp页面往SQL2005插入数据报错
错误是：The server encountered an internal error () that prevented it from fulfilling this request.

exception 

java.lang.NullPointerException
cn.wy.CtrlServlet.Reg.processRequest(Reg.java:63)
cn.wy.CtrlServlet.Reg.doPost(Reg.java:86)
javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)


note The full stack trace of the root cause is available in the Apache Tomcat/6.0.35 logs.
源码：
DBConnection dbc=null;
  String userEmail;
  String userName;
  String userPwd;
  //int userSex;
  //Date userbirthday = null;
  //String userSchool;
  response.setContentType("text/html;charset=UTF-8");  
  out = response.getWriter();
  try{ dbc = new DBConnection();  
  PreparedStatement ps = null;  
  userEmail = request.getParameter("userEmail");  
  userName = request.getParameter("userName");  
  userPwd = request.getParameter("userPwd");
  System.out.print(userEmail);
  System.out.print(userName);
  System.out.print(userPwd);
  //userSex = Integer.parseInt(request.getParameter("userSex")); 
   
  //userSchool = request.getParameter("userSchool");  
  if (userName != null && userPwd != null && userEmail != null)
  {
  ps = dbc.getCon().prepareStatement("insert into ceshi (userEmail,userName,userPwd)" +" values(?,?,?)");
  ps.setString(1, userEmail);  
  ps.setString(2, userName);  
  ps.setString(3, userPwd); 
// //ps.setDate(5, userbirthday); 
  //ps.setInt(4, userSex);  
  ps = dbc.getCon().prepareStatement("insert into ceshi values(userEmail,userName,userPwd)");
  ps.execute();
  System.out.print("新用户注册：" + request.getParameter("userName") + " ");
  out.print("<script>alert('恭喜您：注册成功！现已经登录到网站！');history.go(-1)</script>");
  }
  if (dbc != null)  
  dbc.dbClose();
  }
  catch(SQLException ex)
  { out.print("<script>alert('注册失败！数据库连接错误！');history.go(-1)</script>");  
  ex.printStackTrace();  
  if (dbc != null)  
  dbc.dbClose(); }
  }



------解决方案--------------------
建议单步调试你的程序 上面的显示错误应该不是数据库报错
我的异常网推荐解决方案：The server encountered an internal error () that prevented it from fulfilling this request.,http://www.aiyiweb.com/java-web/317.html