I'm not sure I understand this issue actually. A thread can only
perform one task at a time, so your third scenario should be
impossiblebecause the FacesContext should be unbound before the thread
processes another task.
Are you using IBM's vm?
Sent from my iPhone
On Mar 12, 2009, at 2:32 AM, Matthias Wessendorf <[email protected]>
wrote:
Hi David,
you said you see the issues on you x86_64 linux box with your
application.
My question is now, do you see that with the plain vanilla 1.2.10 demo
application too ?
Eventually I am also interested in the WLS version that you are using.
Can you also create a jira ticket, so that we can keep track of it ?
Thanks,
Matthias
On Thu, Mar 12, 2009 at 6:12 AM, David Birch <[email protected]>
wrote:
Hi, we've been getting an intermittent error with Trinidad that i
think i
have traced to the logic for resource retrieval. From following the
code of
ResourceServlet i can see there is an expectation by some classes
it calls
(mostly ResourceLoader subclasses) of a FacesContext to exist, i
can see
there is code at the very start of the servlet that creates the
FacesContext
if one doesn't already exist, though i think there must be at least
the
following scenarios to consider;
(a) thread(s) for ResourceServlet are completely different to the
initial
page creation thread, and thus a faces context is created & so
subsequent
gets on it are ok
(b) thread(s) for ResourceServlet are executed with the same thread
as for
the initial page creation, and for whatever reason the FacesContext
hasn't
yet been fully cleaned up & is still attached & so access is ok.
(c) thread(s) for ResourceServlet hit the unlucky scenario where
the thread
still has a FacesContext left in it, and so ResourceServlet doesn't
create
one, but then a call later on in a class invoked by ResourceServlet
tries to
use the FacesContext & none exists
The problem generally manifests much like the stacktrace below,
with a null
pointer resulting from there not being a valid faces context & the
resource
servlet not being able to determine the locale.
at
weblogic.
servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
at
weblogic.
servlet.
internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)
at
weblogic.
servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
at
weblogic.servlet.internal.WebAppServletContext
$ServletInvocationAction.run(WebAppServletContext.java:3496)
at
weblogic.
security.
acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(Unknown Source)
at
weblogic.
servlet.
internal.
WebAppServletContext.securedExecute(WebAppServletContext.java:2180)
at
weblogic.
servlet.
internal.WebAppServletContext.execute(WebAppServletContext.java:2086)
at
weblogic.
servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1406)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)
Caused by: java.lang.ExceptionInInitializerError
at
org.
apache.
myfaces.
trinidadinternal.
resource.
CoreRenderKitResourceLoader.<init>(CoreRenderKitResourceLoader.java:
55)
... 59 more
Caused by: java.lang.NullPointerException
at
org.
apache.
myfaces.
trinidadinternal.
resource.
CoreRenderKitResourceLoader.
getLocale(CoreRenderKitResourceLoader.java:94)
at
org.
apache.
myfaces.
trinidadinternal.
resource.
CoreRenderKitResourceLoader.
getLocaleElementsURI(CoreRenderKitResourceLoader.java:80)
at
org.
apache.
myfaces.
trinidadinternal.
resource.
LocaleElementsResourceLoader.
<clinit>(LocaleElementsResourceLoader.java:113)
... 60 more
Without knowing the code very well i'm not sure of the best
solution (ours
is temporarily to force a default for the locale in the
ResourceLoaders),
but i did notice this isn't logged very well (i added extra logging
to get
this trace), and also that the Null ResourceLoaders (i.e. can't be
created/init'd) are cached - perhaps only good ResourceLoaders
should be
cached ?
The issue seems more prevalent on multi-cpu/core machines, and is
highly
reproduceable on x86_64 linux, but on our other enviros - Solaris
Sparc &
windows we rarely see it.
Any ideas/suggestions?
thanks
David
--
Matthias Wessendorf
blog: http://matthiaswessendorf.wordpress.com/
sessions: http://www.slideshare.net/mwessendorf
twitter: http://twitter.com/mwessendorf
