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Posted to users@tomcat.apache.org by John Sisk <js...@yahoo.com> on 2001/05/19 15:21:56 UTC

CookieServlet giving a NullPointerException

Hi,

This is the start of the stacktrace I get when I try the Tomcat (v
4.0-b-5)CookieExample servlet. Worked fine on Tomcat 3.2 win98/win2k, broke
when I upgraded to 4.0. Has anyone else seen/fixed this before I start
digging?

A Servlet Exception Has Occurred
java.lang.NullPointerException
 at CookieExample.doGet(CookieExample.java:53)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)

Regards
John Sisk


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Re: CookieServlet giving a NullPointerException

Posted by Bo Xu <bo...@cybershop.ca>.
John Sisk wrote:

> Hi,
>
> This is the start of the stacktrace I get when I try the Tomcat (v
> 4.0-b-5)CookieExample servlet. Worked fine on Tomcat 3.2 win98/win2k, broke
> when I upgraded to 4.0. Has anyone else seen/fixed this before I start
> digging?
>
> A Servlet Exception Has Occurred
> java.lang.NullPointerException
>  at CookieExample.doGet(CookieExample.java:53)
>  at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
>
> Regards
> John Sisk

Hi :-)  I am not sure, in  CookieExample.java from Tc4.0-b5:

         ...
        Cookie[] cookies = request.getCookies();   //line52
        if (cookies.length > 0) {                               //line53
         ...

so I think the reason  is:
 with some reason, "cookies" is null, so you got a NullPointerException.


Bo
may.19, 2001