新手，，求高手帮忙看看这个错误是什么原因

fanshine 2007-03-30 02:52:48

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: Exception in JSP: /contact.jsp:14

11: <body>
12: <TABLE>
13: <%java.util.Vector v = pageCtl.getResult();
14: java.util.Enumeration e = v.elements();
15:
16: while(e.hasMoreElements()){
17: Object[] obj = (Object[])e.nextElement();

Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:504)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

root cause

java.lang.NullPointerException
org.apache.jsp.contact_jsp._jspService(contact_jsp.java:66)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

note The full stack trace of the root cause is available in the Apache Tomcat/5.5.17 logs.

--------------------------------------------------------------------------------

Apache Tomcat/5.5.17

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fanshine 2007-10-23

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谢谢

uniume 2007-04-03

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snow8261 2007-03-31

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同意楼上

KevinXie 2007-03-30

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13: <%java.util.Vector v = pageCtl.getResult();
14: java.util.Enumeration e = v.elements();

第13行代码区出的v是个空对象null值

而你第14行对null对象操作了,所以会发生java.lang.NullPointerException错误.

程序要判断一下:

13: <%java.util.Vector v = pageCtl.getResult();
14: if (v != null) {
14: java.util.Enumeration e = v.elements();
15:
16: while(e.hasMoreElements()){
17: Object[] obj = (Object[])e.nextElement();
18:}
........
........

wwwjava2 2007-03-30

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给大家推荐个

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imA 2007-03-30

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13: <%java.util.Vector v = pageCtl.getResult();
14: java.util.Enumeration e = v.elements();
15:
16: while(e.hasMoreElements()){
17: Object[] obj = (Object[])e.nextElement();

这几行代码中的某个变量是Null值,发生了空指针错误,估计是你的java.util.Vector v = pageCtl.getResult();这句中的v是空指针.

你可以调试一下看看,或者判断一下看看.好好检查你的代码