at org.apache.jsp.result_jsp._jspService(result_jsp.java:66)

at org.apache.jsp.result_jsp._jspService(result_jsp.java:66)
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 /result.jsp at line 13
10:
11:
16:

Stacktrace:
x05org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:521)
x05org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:430)
x05org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
x05org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
x05javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
root cause
java.lang.NullPointerException
x05org.apache.jsp.result_jsp._jspService(result_jsp.java:66)
x05org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
x05javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
x05org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:388)
x05org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
x05org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
x05javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
note The full stack trace of the root cause is available in the
Apache Tomcat/6.0.35 logs.
九月 04,2013 9:26:10 上午 org.apache.catalina.core.StandardWrapperValve invoke
SEVERE:Servlet.service() for servlet jsp threw exception
java.lang.NullPointerException
运行result.jsp报错,烦请大家帮忙看看具体是什么错误,
yangyang321001 1年前 已收到1个回答 举报
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殇逝86 幼苗

共回答了20个问题采纳率：90% 举报

JSP页面第13行的for循环没有关闭.应该如下：

for(int i=0; i < books.size(); i++){
Book book = books.get(i);

}

1年前 追问

4

yangyang321001 举报

您再看看 他的括号 是不是25行那个？

但是报错的信息又是13行的

举报 殇逝86

怀疑是：books这个对象为空。 也就是从session中没有取到books的值。

你在for循环之前加个调试信息，看看 <%=book%> 或 <%=book.size()%>
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