>>
>>They have to be seperate
>> because WEB-INF/classes is reloadable (and thus has to be
>> disposable) while WEB-INF/lib is meant to be static. So the
>> disposable CL has a parent CL that is responsible for
>> WEB_INF/lib
>
>OK, this means that the WEB-INF/lib ClassLoader cannot access
>the classes managed by the WEB-INF/classes classloader. Now,
>I don't have enough knowledge of Java internals to state what
>happens when I call 'Class.forName("myclass")' - what ClassLoader
>will be used... Does it depend on what CL loaded the class
containg
>the code, or on the thread that is executing the code?
>
Yes, Class.forName("myclass") will load the class "myclass" with
the classloader that loaded the currently executing class. But,
this classloader will first defer to its parent classloader. (This
is Java 2 style classloading. The convention of defering to the
parent classloader was not as strictly encouraged in pre-Java 2.)
>
>I can only say that Class.forName() works for me... I have the
>modules
>(screens etc), and my model classes, including Services in
>classes/
>and Turbine in lib/ and I haven't had any problems like that.
>Mayble it's JDK version dependent (I use 1.3/linux) or I am just
lucky :-)
>
You not just lucky :-) If the class from which you call
Class.forName("myService") was loaded from the system Classpath and
myService is in classes/ or lib/, then myService will not be found.
This is because the classloader that corresponds to the system
classpath is a parent of the classloader that corresponds to lib/
or classes/ (under $TOMCAT_HOME/webapps/).
So, the safest thing to do is put everything under
$TOMCAT_HOME/webapps/myTurbineApp/. This of course is not always
practical and involves quite a bit of repetition. But you
definately should not have Turbine.jar or any of your application
code in the system classpath when you start Tomcat. I usually keep
a separate console (with a clean classpath) for starting and
stopping Tomcat. There was quite a bit of discussion (and
confusion) on the Tomcat-dev mailing list a few months ago about
classloader issues.
-Brian Parker
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