uthay wrote:
> Thx Jim
>
> I tried that.
> I also want to bring some other thing I read recently.
> It states that although tomcat supports class reloading on updation it is
> still not supported to those classes that are not servlets.
> What does that supposed to mean?
> [...]
> [...]
> >
> > Uthay - I was having the same problem. See my post yesterday under subject
> > JSP caching.
> >
> > The problem is that your WEB-INF directory is probably in your CLASSPATH
> > when you start Tomcat - see the FAQ - it won't reload classes in your
> > CLASSPATH
> >
> > There is a question/answer in the FAQ re: this - I feel dumb about it. Now
> > you can too :)
> >
> > Good luck.
> >
> > Jim
> [...]
> [...]
> > >From: "uthay"
> > >Subject: Tomcat class loader
> > >Date: Tue, 27 Feb 2001 13:15:44 -0000
> > >
> > > It was stated in the tomcat installation instructions that tomcat will
> > > reload any servelet or jsp file if the file is changed.
> > > I am using a package through a servlet. Although I have modified the
> > > package, tomcat is refusing to load the new classes and holding onto the
> > > older ones.
> > > May be its because they are not servlets??????
> > > Is there anyway of solving this.
> > > Does tomcat follow a different class loading mechanism for classes
> > >that are not servlets. (classes in WEB-INF)?
> [...]
Hi :-) I am not sure, the following is from my work with
jakarta-tomcat-4.0-b1(standalone, JDK1.3, winnt40), I post
here as a reference:
* in myapp(one special webapp):
- all MyServlet(Servlet class) in WEB-INF/classes
- all MyHelper(Helper class, class-style) in WEB-INF/classes
- all MyHelper(Helper class, jar-style) in WEB-INF/lib
are loaded by the same(OnlyOne) classloader;
and if ANY of them is modified, then:
- after a while(for example, 0.x second to several seconds)
AND
- get a client-requesting which is to any servlet definition of
any MyServlet in myapp
then:
- the old OnlyOne classloader is destroied ; a new OnlyOne
classloader is made.
- at least, that MyServlet class which is belong to that servlet
definition which is invoked is loaded ;
and an instance of this loaded class is made for that servlet
definition which is being requested;
and all MyHelper need by the loaded class is loaded by
the same OnlyOne classloader.
- just from my work, I didn't find any servlet definition which
has "<load-on-startup></load-on-startup>" can be "started"
at this moment(reloading) -> IF this servlet definition doesn't
get a client-requesting.
-after this moment, the new OnlyOne classloader begins to work,
just like the old one.
- now because the old classloader is not there, so if we put some
object which is loaded by the old classloader into ServletContext
as a Attribute, now perhaps this object will not have its Class
object( it is like a tree without root :-) ), but now this object
also can not be GCed-> it has a reference in ServletContext ,
so now perhaps our servlet code will meet a error.
* and I also have a question about the "Shared classloader"
- I find when jakarta-tomcat-4.0-b1 starts, all my CLASSPATH
is lost -> jakarta-tomcat-4.0-b1 disable all "custom CLASSPATH",
is that right? if so, I guess it means I can not use some "System
classloader", am I right?
- so now I try to find a classloader within jakarta-tomcat-4.0-b1,
but because the classloader "inside every wepapp" will be
destroied/re-made, so sometimes I want to use the "Shared
classloader" to load some MyHelper which need to "live for
long time", but just from my work, no matter I put MyHelper
(jar style) in:
% TOMCAT_HOME/lib
% TOMCAT_HOME/classes
I can not load MyHelper in MyServlet, and I got the following
in browser:
HTTP Status 500 - /myServletFolder0/servlet/MyServlet
The server encountered an internal error
(/myServletFolder0/servlet/MyServlet)
that prevented it from fulfilling this request.
so:
- can anybody do the above with jakarta-tomcat-4.0-b1?
- can anybody do the above with 3.2.1 or other version?
thanks very much in advance! if somebody can give me direction
about how to do it, I will send you a good 2CD->" many signers
tribute to Bob Dylan" it is very good! :-) Stevie Wonder sings
a song named "blow in the wind", and I think he sings this song
much better than Bob Dylan himself! //hahahahaha :-) :-)
Bo
Feb.27, 2001
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