널포인터 에러가 자꾸 나서 이부분에 대해서 질문좀 해도될까여

mvc list page에 값을 얻어와서 출력하려고 하는데 에러가 발생해서요

dbTest에서 db에서 값얻어오기 실행은 되고

인덱스에서 리스트 페이지를 출력하는것도 되는데

이부분에서 에러가 나요

===================================================================

리스트 페이지를 다지우고 이부분만 남겼는데도 널포인터 에러가 나더라구여

다른 페이지도 같이 첨부했는데 이유를 찾아주시면 감사하겠습니다.

==========================================

list.jsp

<%@ page language="java" contentType="text/html; charset=EUC-KR" pageEncoding="EUC-KR"%>
<%@ page import = "java.util.*" %>
<%@ page import = "app.mvc.board.*" %>

<%
int total = Integer.parseInt(request.getAttribute("total").toString());
out.println(String.valueOf(total));


%>

==============================================

(BoardDAO.JAVA)

package app.mvc.board;

import javax.naming.*;
import javax.sql.*;
import java.sql.*;
import java.util.*;

public class BoardDAO {

private Context initContext, envContext;
private DataSource ds;
private Connection con;
private Statement stmt;
private PreparedStatement pstmt;
private ResultSet rs;

public BoardDAO()throws NamingException{

initContext = new InitialContext();
envContext =(Context)initContext.lookup("java:comp/env");
ds = (DataSource)envContext.lookup("jdbc/RTFD");

}
// list
public int getTotalRecord(){
int total = 0;
String sql = "select count(*) from tblBoard";
//String sql= "select * from tblBoard";

try{
con = ds.getConnection();
stmt = con.createStatement();
rs = stmt.executeQuery(sql);

if(rs.next()){
//if(rs != null){
total = rs.getInt(1);
}
}
catch(Exception e){
System.out.println("getTotalRecord : " + e);
}
finally{
try{rs.close();}catch(SQLException err){}
try{stmt.close();}catch(SQLException err){}
try{con.close();}catch(SQLException err){}
}
return total;
}
public List BoardList(){
String sql = "select * from tblBoard order by b_idx desc";
List list = new ArrayList();

try{
con = ds.getConnection();
stmt = con.createStatement();
rs = stmt.executeQuery(sql);

while(rs.next()){
BoardDO vo = new BoardDO();
vo.setB_idx(rs.getInt("b_idx"));
vo.setB_id(rs.getString("b_id"));
vo.setB_pw(rs.getString("b_pw"));
vo.setB_name(rs.getString("b_name"));
vo.setB_email(rs.getString("b_email"));
vo.setB_title(rs.getString("b_title"));
vo.setB_content(rs.getString("b_content"));
vo.setB_group(rs.getInt("b_group"));
vo.setB_level(rs.getInt("b_level"));
vo.setB_date(rs.getString("b_date"));
vo.setB_cnt(rs.getInt("b_cnt"));

list.add(vo);
}
}
catch(Exception e){
System.out.println("BoardList : " + e);
}
finally{
try{rs.close();}catch(SQLException err){}
try{stmt.close();}catch(SQLException err){}
try{con.close();}catch(SQLException err){}
}
return list;
}

}

==============================================================================================

BoardController.java

package app.mvc.board;

import java.io.IOException;

import javax.naming.NamingException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.*;

public class BoardController extends HttpServlet {

@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
doService(req, resp);
}

@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
doService(req, resp);
}

protected void doService(HttpServletRequest req, HttpServletResponse res)throws ServletException, IOException {

String reqUri = req.getRequestURI();
String ctPath = req.getContextPath();
String cmd = reqUri.substring(ctPath.length());
String nextPage = null;

if(cmd.equals("/list.board")){
try{
BoardDAO dao = new BoardDAO();
List list = dao.BoardList();

req.setAttribute("list", list);
req.setAttribute("total", dao.getTotalRecord());
}
catch(NamingException e){
e.printStackTrace();
}
nextPage = "board/list.jsp";
}
else if(cmd.equals("/searchList.board")){

}else if(cmd.equals(" /searchList.board")){

}else if(cmd.equals("/write.board")){

}else if(cmd.equals(" /read.board")){

}else if(cmd.equals(" /delete.Board")){

}
else if(cmd.equals("reply.board")){

}

RequestDispatcher view = req.getRequestDispatcher(nextPage);
view.forward(req, res);


}

}

====================================

에러 표시 내용

HTTP Status 500 - java.lang.NullPointerException

type Exception report

message java.lang.NullPointerException

description The server encountered an internal error that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: java.lang.NullPointerException org.apache.jasper.servlet.

JspServletWrapper.handleJspException(JspServletWrapper.java:555) org.apache.jasper.servlet.JspServletWrapper.service

(JspServletWrapper.java:476) org.apache.jasper.servlet.JspServlet.serviceJspFile

(JspServlet.java:396) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340) 

javax.servlet.http.HttpServlet.service(HttpServlet.java:729) org.apache.tomcat.websocket.server.

WsFilter.doFilter

(WsFilter.java:52) app.mvc.board.BoardController.doService(BoardController.java:64) app.mvc.board.

BoardController.doGet

(BoardController.java:19) javax.servlet.http.HttpServlet.service(HttpServlet.java:622) 

javax.servlet.http.HttpServlet.service(HttpServlet.java:729) org.apache.tomcat.websocket.server.

WsFilter.doFilter(WsFilter.java:52) 

app.mvc.AppFrontController.doService(AppFrontController.java:51) app.mvc.AppFrontController.doGet

(AppFrontController.java:16) javax.servlet.http.HttpServlet.service

(HttpServlet.java:622) javax.servlet.http.HttpServlet.service(HttpServlet.java:729) org.apache.

tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

root cause

java.lang.NullPointerException org.apache.jsp.board.list_jsp._jspService(list_jsp.java:100) 

org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) javax.servlet.http.HttpServlet.

service(HttpServlet.java:729) 

org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:438) org.apache.jasper.

servlet.JspServlet.serviceJspFile(JspServlet.java:396) org.apache.jasper.servlet.JspServlet.service

(JspServlet.java:340) 

javax.servlet.http.HttpServlet.service(HttpServlet.java:729) org.apache.tomcat.websocket.server.

WsFilter.doFilter(WsFilter.java:52) app.mvc.board.BoardController.doService(BoardController.java:64) 

app.mvc.board.BoardController.doGet

(BoardController.java:19) javax.servlet.http.HttpServlet.service(HttpServlet.java:622) 

javax.servlet.http.HttpServlet.service(HttpServlet.java:729) org.apache.tomcat.websocket.server.

WsFilter.doFilter(WsFilter.java:52) app.mvc.AppFrontController.doService(AppFrontController.java:51) 

app.mvc.AppFrontController.doGet(AppFrontController.java:16) javax.servlet.http.HttpServlet.service

(HttpServlet.java:622) javax.servlet.http.HttpServlet.service(HttpServlet.java:729) org.apache.tomcat.

websocket.server.WsFilter.doFilter(WsFilter.java:52)

note The full stack trace of the root cause is available in the Apache Tomcat/8.0.23 logs.

Apache Tomcat/8.0.23