接手别人的JavaEE项目之前运行正确，添加访问数据库后报tomcat异常

我重装了tomcat，重新导入了项目又再将我修改的添加进去，运行时报tomcat异常，所以应当不是环境问题

报错截图：

访问数据库按照MVC形式，数据显示在getData.jsp中，servlet为GetDServlet.java,
实现从数据库中取数据的类为getD.java,数据表对应的类为inemo_bean,

下面贴代码：

package Servlet;

import java.io.IOException;
import java.util.ArrayList;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
//import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.Bean.inemo_bean;

/**

Servlet implementation class GetDataServlet
*/
@WebServlet("/GetDataServlet")
public class GetDServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
- @see HttpServlet#HttpServlet() */ public GetDServlet() { super(); }
/**
- @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
- response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.getWriter().append("Served at: ").append(request.getContextPath()); GetD gd = new GetD(); ArrayList al = gd.getArrayList(); request.setAttribute("al", al); System.out.println("GetDataServlet.doGet()"); }
/**
- @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
- response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); System.out.println("GetDataServlet.doPost()"); }

}

package Servlet;

import java.sql.SQLException;
import java.util.ArrayList;

import com.Bean.inemo_bean;
import com.mysql.jdbc.Connection;
import com.mysql.jdbc.ResultSet;
import com.mysql.jdbc.Statement;
import com.scut.older.db.DB;

/**

Servlet implementation class getData

*/
public class GetD {

private Statement st = null;
private ResultSet rs = null;
private Connection ct = null;

public ArrayList getArrayList() {

ArrayList<inemo_bean> al = new ArrayList<inemo_bean>();
String sql = "select * from sensor_data_inemo";
ct = (Connection) new DB().getConn();
st = (Statement) new DB().getStatement(ct);
rs = (ResultSet) new DB().getResultSet(st, sql);

try {
    while (rs.next()) {
        inemo_bean ib = new inemo_bean();
        ib.setId_sensor_data_iNEMO(rs.getInt("id_sensor_data_iNEMO"));
        ib.setDatetime(rs.getInt("datetime"));
        ib.setAccx(rs.getInt("accx"));
        ib.setAccy(rs.getInt("accy"));
        ib.setAccz(rs.getInt("accz"));
        ib.setGyrox(rs.getInt("gyrox"));
        ib.setGyroy(rs.getInt("gyroy"));
        ib.setGyroz(rs.getInt("gyroz"));
        ib.setMagx(rs.getInt("magx"));
        ib.setMagy(rs.getInt("magy"));
        ib.setMagz(rs.getInt("magz"));
        ib.setPress(rs.getInt("press"));
        ib.setTemp(rs.getInt("press"));
        ib.setAltitude(rs.getInt("altitude"));
        ib.setLongitude(rs.getInt("longitude"));
        ib.setLatitude(rs.getInt("latitude"));

        al.add(ib);
    }
} catch (SQLException e) {
    e.printStackTrace();
    System.out.println("getData.getArrayList()");
    System.err.println("getdata()出错");
} finally {
    closeSource();
}
return al;

}

private void closeSource() {
try {
if (rs != null)
rs.close();
if (st != null)
st.close();
if (ct != null)
ct.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

public GetD() {
super();
}

}

<%@page import="com.Bean.inemo_bean"%>
<%@page import="java.util.ArrayList"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

Data from inemo

Get Data From DataBase -sensor_inemo_data

<%
ArrayList al = (ArrayList)request.getAttribute("al");
%>

<%
for (int i = 1; i <= al.size(); i++) {
inemo_bean inemo = al.get(i);
%>

    </tr>
    <%
        }
    %>
</table>

id_sensor_data_iNEMO

datetime

accx

accy

accz

gyrox

gyroy

gyroz

magx

magy

magz

press

temp

altitude

longitude

latitude

<%=inemo.getId_sensor_data_iNEMO()%>

<%=inemo.getDatetime()%>

<%=inemo.getAccx()%>

<%=inemo.getAccy()%>

<%=inemo.getAccz()%>

<%=inemo.getGyrox()%>

<%=inemo.getGyroy()%>

<%=inemo.getGyroz()%>

<%=inemo.getMagx()%>

<%=inemo.getMagy()%>

<%=inemo.getMagz()%>

<%=inemo.getPress()%>

<%=inemo.getTemp()%>

<%=inemo.getAltitude()%>

<%=inemo.getLongitude()%>

<%=inemo.getLatitude()%>

谢谢大家我自己找到bug了，我的两个servlet在配置文件中写重复了

自己打个断点，F6单步执行。找到报错的地方

是不是tomcat中配置jndi时没配置正确

tomcat里面的catalina里面清除下。

仔细看看配置有没有错误！！

谢谢大家我自己找到bug了，我的两个servlet在配置文件中写重复了