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Posted to users@tomcat.apache.org by John Baker <jb...@teamenergy.com> on 2001/07/19 10:40:17 UTC
MIssing Classes - WHAT is the answer? :-)
Right! Enough of this! I'm confused!
Obviously there is confusion to why tomcat seems to not find classes that are
clearly located in the WEB-INF/classes directory (in package names, or
whatever) or in a jar. This appears to be a bug with the ClassLoad that is in
place, as has been pointed out to me.
I've read about dynamic compilation and class loading problems. Well I've had
no problems with my jsp pages finding classes in jars or the classes
directory.
I don't know why is responsible for this part of tomcat, or whether this is
the right list to post to, but wouldn't it be a good idea for someone who
knows what they are talking about (ie whoever wrote this part of Tomcat!) to
write a mail stating exactly how it should work, and what known problems
there are. If there are known problems, are they being addressed? It's
difficult to tell people (management) that Tomcat is the solution if there is
no gaurantee that this is being looked at. However as I love tomcat and open
source, I'd rather use it than some offering from another company :)
Clearly, if there are classes in the WEB-INF/classes, or within a jar in
WEB-INF/lib, then they should be found from Jsp pages or any object that sits
in the session. My problem, as I've pointed out before, is the ClassLoader
that gets given to a Thread I try and start from a ServletContextListener. Ie
a Thread I start to read news when the web application starts. Classes are
just not found. Oddly enough, if I start this same thread from the top of a
Jsp page - it works fine!
So, would someone like to enlighten us all so we can stop guessing and
confusing the issue. There are just too many mails about this topic now, and
it's hard to work out what the correct answer is.
Cheers
John Baker (still sifting through the many many of posts on this ;-)
On Wednesday 18 July 2001 22:50 pm, you wrote:
> Hmmm.
>
> According to Dr. Mel Martinez on the tomcat-dev list, Jasper *cannot* see
> the web-inf/classes part of your web app for compliation. SO, I guess the
> solution is to pre-compile the JSP's (somehow) and leave the compiled
> .class files in the TOMCAT_HOME/work directory.
>
> Then, we're *screwed* if a customer wants to modify one of the JSP files
> on their server.
>
> Grrr.
>
> Ideas?
>
>
>
> http://w6.metronet.com/~wjm/tomcat/2001/Mar/msg00696.html
--
John Baker, BSc CS.
Java developer, Linux lover.
I don't wanna rock, DJ.
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=====
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Re: MIssing Classes - WHAT is the answer? :-)
Posted by John Baker <jb...@teamenergy.com>.
On Thursday 19 July 2001 10:44 am, you wrote:
> John,
>
> I've only lightly been following this so excuse my late joining, but... Do
> you have an isolated test that demonstrates the behaviour? Perhaps with
> some sample code we can look at it.
Not an isolated test. I might get round to writing one. I'm just really busy
with worky stuff right now, so writing an isolated demo is low on the
priority list, as I have a 'hack' to get around the flaw. I'm just interested
on what a tomcat developer has to say on the matter :-)
> I might also add that I am not a tomcat developer, but just another user
> trying to help.
Ta. I'll try and get around to isolating some code within the next few days.
> cheers
> dim
>
> On Thu, 19 Jul 2001, John Baker wrote:
> > Right! Enough of this! I'm confused!
> >
> > Obviously there is confusion to why tomcat seems to not find classes that
> > are clearly located in the WEB-INF/classes directory (in package names,
> > or whatever) or in a jar. This appears to be a bug with the ClassLoad
> > that is in place, as has been pointed out to me.
> >
> > I've read about dynamic compilation and class loading problems. Well I've
> > had no problems with my jsp pages finding classes in jars or the classes
> > directory.
> >
> > I don't know why is responsible for this part of tomcat, or whether this
> > is the right list to post to, but wouldn't it be a good idea for someone
> > who knows what they are talking about (ie whoever wrote this part of
> > Tomcat!) to write a mail stating exactly how it should work, and what
> > known problems there are. If there are known problems, are they being
> > addressed? It's difficult to tell people (management) that Tomcat is the
> > solution if there is no gaurantee that this is being looked at. However
> > as I love tomcat and open source, I'd rather use it than some offering
> > from another company :)
> >
> > Clearly, if there are classes in the WEB-INF/classes, or within a jar in
> > WEB-INF/lib, then they should be found from Jsp pages or any object that
> > sits in the session. My problem, as I've pointed out before, is the
> > ClassLoader that gets given to a Thread I try and start from a
> > ServletContextListener. Ie a Thread I start to read news when the web
> > application starts. Classes are just not found. Oddly enough, if I start
> > this same thread from the top of a Jsp page - it works fine!
> >
> > So, would someone like to enlighten us all so we can stop guessing and
> > confusing the issue. There are just too many mails about this topic now,
> > and it's hard to work out what the correct answer is.
> >
> >
> >
> > Cheers
> >
> >
> > John Baker (still sifting through the many many of posts on this ;-)
> >
> > On Wednesday 18 July 2001 22:50 pm, you wrote:
> > > Hmmm.
> > >
> > > According to Dr. Mel Martinez on the tomcat-dev list, Jasper *cannot*
> > > see the web-inf/classes part of your web app for compliation. SO, I
> > > guess the solution is to pre-compile the JSP's (somehow) and leave the
> > > compiled .class files in the TOMCAT_HOME/work directory.
> > >
> > > Then, we're *screwed* if a customer wants to modify one of the JSP
> > > files on their server.
> > >
> > > Grrr.
> > >
> > > Ideas?
> > >
> > >
> > >
> > > http://w6.metronet.com/~wjm/tomcat/2001/Mar/msg00696.html
> >
> > --
> > John Baker, BSc CS.
> > Java developer, Linux lover.
> > I don't wanna rock, DJ.
--
John Baker, BSc CS.
Java developer, Linux lover.
I don't wanna rock, DJ.
Re: MIssing Classes - WHAT is the answer? :-)
Posted by Dmitri Colebatch <di...@bigpond.net.au>.
John,
I've only lightly been following this so excuse my late joining, but... Do
you have an isolated test that demonstrates the behaviour? Perhaps with
some sample code we can look at it.
I might also add that I am not a tomcat developer, but just another user
trying to help.
cheers
dim
On Thu, 19 Jul 2001, John Baker wrote:
> Right! Enough of this! I'm confused!
>
> Obviously there is confusion to why tomcat seems to not find classes that are
> clearly located in the WEB-INF/classes directory (in package names, or
> whatever) or in a jar. This appears to be a bug with the ClassLoad that is in
> place, as has been pointed out to me.
>
> I've read about dynamic compilation and class loading problems. Well I've had
> no problems with my jsp pages finding classes in jars or the classes
> directory.
>
> I don't know why is responsible for this part of tomcat, or whether this is
> the right list to post to, but wouldn't it be a good idea for someone who
> knows what they are talking about (ie whoever wrote this part of Tomcat!) to
> write a mail stating exactly how it should work, and what known problems
> there are. If there are known problems, are they being addressed? It's
> difficult to tell people (management) that Tomcat is the solution if there is
> no gaurantee that this is being looked at. However as I love tomcat and open
> source, I'd rather use it than some offering from another company :)
>
> Clearly, if there are classes in the WEB-INF/classes, or within a jar in
> WEB-INF/lib, then they should be found from Jsp pages or any object that sits
> in the session. My problem, as I've pointed out before, is the ClassLoader
> that gets given to a Thread I try and start from a ServletContextListener. Ie
> a Thread I start to read news when the web application starts. Classes are
> just not found. Oddly enough, if I start this same thread from the top of a
> Jsp page - it works fine!
>
> So, would someone like to enlighten us all so we can stop guessing and
> confusing the issue. There are just too many mails about this topic now, and
> it's hard to work out what the correct answer is.
>
>
>
> Cheers
>
>
> John Baker (still sifting through the many many of posts on this ;-)
>
> On Wednesday 18 July 2001 22:50 pm, you wrote:
> > Hmmm.
> >
> > According to Dr. Mel Martinez on the tomcat-dev list, Jasper *cannot* see
> > the web-inf/classes part of your web app for compliation. SO, I guess the
> > solution is to pre-compile the JSP's (somehow) and leave the compiled
> > .class files in the TOMCAT_HOME/work directory.
> >
> > Then, we're *screwed* if a customer wants to modify one of the JSP files
> > on their server.
> >
> > Grrr.
> >
> > Ideas?
> >
> >
> >
> > http://w6.metronet.com/~wjm/tomcat/2001/Mar/msg00696.html
>
> --
> John Baker, BSc CS.
> Java developer, Linux lover.
> I don't wanna rock, DJ.
>