Question

JAVAWEB问题，找不出问题原因，求大神指点，急！

HTTP Status 500 -

type Exception report

message

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

exception org.apache.jasper.JasperException: An exception occurred processing JSP page /message1.jsp at line 51

48:
49: <tr>
50: <td height="823" colspan="3"><form action="Replayadd" method="post"><input type="hidden" value=<%=a.getId()%> id="mid" name="mid"></input>
51: <input type="hidden" value=<%=p.getNum()%> id="pid" name="pid"></input>
52: <textarea maxlength="200" id="replayvlue" name="replayvlue" rows="4" cols="50"></textarea><br>
53: <input type="submit" value="锲炲" align="right"/>
54: </form>

Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:524)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:435)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
cn.com.jdnh.servelt.Messgaeread.doPost(Messgaeread.java:40)
cn.com.jdnh.servelt.Messgaeread.doGet(Messgaeread.java:23)
javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

root cause java.lang.NullPointerException
org.apache.jsp.message1_jsp._jspService(message1_jsp.java:130)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
cn.com.jdnh.servelt.Messgaeread.doPost(Messgaeread.java:40)
cn.com.jdnh.servelt.Messgaeread.doGet(Messgaeread.java:23)
javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
<%
String path = request.getContextPath();
Message a=(Message)request.getAttribute("message");
List<Replay> l=(List<Replay>)request.getAttribute("replay");
People p=(People)session.getAttribute("pp");
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
网页最上方获取值得部分

Answer 1

第51行, 应该是 p 为 null 了,看看你在后台赋值的时候这个赋值位置对不对

追问

在赋值的时候是有值得

追答

报的就是为空了,最好能贴出代码来看看,看不到代码不好说

追问

私信你了，字数太多没办法发。。。。。。

追答

你把输出地方 改成 ${p.num} 看看

Answer 2

我帮你修改吧