L.
Shapira, Yoav wrote:
Howdy, The best thing is to come up with a way for us to reproduce it. The simplest, most direct way to get the exception.
Yoav Shapira Millennium ChemInformatics
-----Original Message----- From: Laurie Harper [mailto:[EMAIL PROTECTED] Sent: Tuesday, September 09, 2003 6:17 PM To: [EMAIL PROTECTED] Subject: NullPointer on getParameter
Hi, I'm trying to figure out a problem we've encountered since
upgrading
to Tomcat 4.1. I've seen this both on 4.1.24 and 4.1.27. I haven't yet reduced it to a specific recipe for reproduction outside the context of my application but I do see this quite frequently so I thought I'd see if anyone else has come across it...
The problem is that a call to getParameter is getting a NullPointerException in the delegation method on CoyoteRequestFacade:
Caused by: java.lang.NullPointerException at org.apache.coyote.tomcat4.CoyoteRequestFacade. getParameter(CoyoteRequestFacade.java:178) at javax.servlet.ServletRequestWrapper. getParameter(ServletRequestWrapper.java:203)
I checked the code and line 178 just a call to the wrapped
CoyoteRequest
object, meaning that reference is null. Now, there's only two ways it could be null: a null reference was passed into CoyoteRequestFacade's constructor, or CoyoteRequestFacade.clear() was called.
As I understand it, a CoyoteRequestFacade should be associated with a request when it starts and not released until the request has completed so I'm leaning towards looking at the first possibility. Can anyone
give
me an overview of the 'life cycle' of CoyoteRequestFacade? Where is it created, managed, assigned/reclaimed from a particular request, etc?
Better yet, has anyone run into this and found a solution? The nearest thing I could find was Bug# 21611 which sounds like the same problem. From the commentary, it doesn't look like there's a known cause yet; what would be the best way to track this down (as I say, I can
reproduce
the behaviour easily here)?
Thanks,
L.
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