If ExternalSystemMockImpl is contained in a JAR file that's in
$CATALINA_HOME/common/lib, I don't see why the app wouldn't be able to load it.
For example, I've got a JAR file for the Oracle JDBC driver in common/lib and I
can do the following just fine in a JSP:
<%
ClassLoader cl = getClass().getClassLoader();
Class clazz = cl.loadClass("oracle.jdbc.OracleDriver");
Object obj = clazz.newInstance();
%>
If there's code in the external JAR file that needs to make use of a class
loader, it should probably use the result of
Thread.currentThread().getContextClassLoader(). Can you provide a little more
detail on how the app is using reflection to locate ExternalSystemMockImpl?
Quoting Nicolas De Loof <[EMAIL PROTECTED]>:
> Hi all,
>
> I'm posting on Struts list because I know they're is lot's of J2EE experts
> here.
>
> I want to test my webapp on Tomcat, but it depends on some external system.
> I've got a jar that emulates it. When I
> package it with the webapp (WEB-INF/lib) it works fine.
>
> I would like to test the webapp packaged without this emulator jar. I tried
> putting it in $TOMCAT/common/lib. I get a
> ClassCastException. I think it comes from this :
>
> webapp requires the external API, let's say a class named "ExternalSystem".
> It is configured to search for an
> implementation class named "ExternalSystemMockImpl" (using reflexion API).
>
> Webapp classloader doesn't find it, and delegate class searh to it's parent
> classloader (tomcat ones). Parent
> classloader finds the class from my emulator jar, run it and return some
> "MockResult" object, that implements
> "ExternalResult" from the external API
>
> Calling webapp tries to cast resulting object to "ExternalResult", class that
> is visible to webapp classloader.
>
> Then my code is doing :
>
> ExternalResult result = (ExternalResult) obj;
>
> where obj is my MockResult instance, that implements ExternalResult from
> parent-Classloader, and casting it to a
> webapp-Classloader ExternalResult fails !
>
>
> How can I solve this ClasLoader conflict ?
>
> Nico.
--
Kris Schneider <mailto:[EMAIL PROTECTED]>
D.O.Tech <http://www.dotech.com/>
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