找不到属性从Pojo类访问jsp页面上的数据时出现异常

这是Data Access对象类的代码

pojo类的 public List<UserPojo> viewAllUser(int offset, int noOfRecords) { String query ="select SQL_CALC_FOUND_ROWS fname,Id,mname,lname,gender,State from registration limit "+offset+","+noOfRecords; List<UserPojo> list = new ArrayList<UserPojo>(); UserPojo User = null; try { connection = getConnection(); stmt = connection.createStatement(); ResultSet rs = stmt.executeQuery(query); while (rs.next()) { User = new UserPojo(); User.SetFname(rs.getString("fname")); User.Setid(rs.getInt(2)); User.SetMname(rs.getString("mname")); User.SetLname(rs.getString("lname")); User.SetGender(rs.getString("gender")); User.Setstate(rs.getString("State")); list.add(Fighter); } rs.close(); rs = stmt.executeQuery("SELECT FOUND_ROWS()"); if(rs.next()) this.noOfRecords = rs.getInt(1); } catch (SQLException e) { e.printStackTrace(); } catch (ClassNotFoundException e) { e.printStackTrace(); }finally { try { if(stmt != null) stmt.close(); if(connection != null) connection.close(); } catch (SQLException e) { e.printStackTrace(); } } return list; } 代码是

public String getFname() 
    {
        return fname;
    }

    public void SetFname(String fname) 
    {
        this.fname = fname;
    }

    public String getMname() 
    {
        return mname;
    }

    public void SetMname(String mname) 
    {
        this.mname = mname;
    }

    public String getLname() 
    {
        return lname;
    }

    public void SetLname(String lname) 
    {
        this.lname = lname;
    }



    public String getGender() 
    {
        return gender;
    }

    public void SetGender(String Per) 
    {
        this.gender = Per;
    }



    public String getstate() 
    {
        return state;
    }

    public void Setstate(String state) 
    {
        this.state = state;
    }       

    public int getid()
    {
        return idm;
    }
    public void Setid(int m) 
    {
        this.idm=m;
        System.out.print(m);
    }

}`

Servlet包含以下代码

int page = 1;
    int recordsPerPage = 5;
    if(request.getParameter("page") != null)
    page = Integer.parseInt(request.getParameter("page"));
    UserDAO dao = new UserDAO();
    List<UserPojo> list = dao.viewAllUser((page-1)*recordsPerPage,recordsPerPage);
    int noOfRecords = dao.getNoOfRecords();
    int noOfPages = (int) Math.ceil(noOfRecords * 1.0 / recordsPerPage);
    request.setAttribute("User", list);
    request.setAttribute("noOfPages", noOfPages);
    request.setAttribute("currentPage", page);
    RequestDispatcher view= request.getRequestDispatcher("DisplayUser.jsp");
    view.forward(request, response);

Jsp页面包含代码

<td>${User.gender}</td>
            <td>${User.fname} ${User.mname} ${User.lname}</td>
            <td>${User.state}</td>
            <td>${User.idm}</td>

异常的堆栈跟踪是

type Exception report

消息javax.el.PropertyNotFoundException：在类型FighterPoso上找不到属性'idm'

description服务器遇到内部错误，导致无法完成此请求 .

例外

org.apache.jasper.JasperException：javax.el.PropertyNotFoundException：在类型FighterPoso上找不到属性'idm'org.apache.jasper.servlet.JspServletWrapper.handleJspException（JspServletWrapper.java:502)org.apache.jasper.servlet.JspServletWrapper .service（JspServletWrapper.java:430）org.apache.jasper.servlet.JspServlet.serviceJspFile（JspServlet.java:313）org.apache.jasper.servlet.JspServlet.service（JspServlet.java:260)javax.servlet.http .HttpServlet.service（HttpServlet.java:717)FighterServlet.doGet(FighterServlet.java:30）javax.servlet.http.HttpServlet.service（HttpServlet.java:617）javax.servlet.http.HttpServlet.service（HttpServlet.java） ：717）根本原因

javax.el.PropertyNotFoundException：在类型FighterPoso上找不到属性'idm'javax.el.BeanELResolver $ BeanProperties.get（BeanELResolver.java:214）

无法理解为什么会发生这种异常 . 因为从jsp页面中删除$ 时可以轻松获取所有其他字段 . 有一点我想提一下，id字段是具有自动增量功能的数据库中的主键 .