UC知道JSP出错！！HTTP status 500
来源：百度知道 编辑：UC知道 时间：2024/06/12 03:34:01
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 /index.jsp at line 49
46: <%
47: listMainBoard=(List)mapboard.get(new Integer(1));
48:
49: for(int i=0;i<listMainBoard.size();i++){
50: mainBoard=((Board)listMainBoard.get(i));
51: %>
52: <TR class="tr3">
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:505)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:416)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
root cause
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 /index.jsp at line 49
46: <%
47: listMainBoard=(List)mapboard.get(new Integer(1));
48:
49: for(int i=0;i<listMainBoard.size();i++){
50: mainBoard=((Board)listMainBoard.get(i));
51: %>
52: <TR class="tr3">
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:505)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:416)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
root cause
listMainBoard会不会为空？
说的多明白啊 第49 行 出现空指钟异常
第49 行 只有一个对象可能出现空指钟 那就是 listMainBoard
应该是第47行 获得 listMainBoard 出问题了 你在47行后
写一个打印语句 打印 listMainBoard 看看， 是不是NULL
如果是 你就检查一下