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Date: Sat, 03 Jul 2004 15:23:32 +0200
From: Joerg Heinicke <joerg.heinicke@gmx.de>
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Subject: Re: JspGenerator doesn't work from flow but does otherwise...
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On 02.07.2004 17:01, Terry Brick wrote:

 >>> Weird problem.  I have a small test JSP that I'm accessing using
 >>> JspGenerator.  It works fine if I hit it straight from the
 >>> browser (with a URL that matches pipeline in my sitemap) but it
 >>> fails if I call the exact same thing from my flow script using
 >>> sendPage("hello.jsp").

<snipped what="most simple use case, calling hello.jsp via
cocoon.sendPage()"/>

> -------------------------------------------------
> URL That Works 
> ------------------------------------------------- 
> http://localhost:8080/Cocoon/jsptest/hello.jsp
> 
> -------------------------------------------------
> URL That Doesn't Work
> ------------------------------------------------- 
> http://localhost:8080/Cocoon/jsptest/jspflow

>>> Here's the Exception Stack Trace

Original Exception: java.lang.ClassCastException
	at 
org.apache.jasper.compiler.JspRuntimeContext.<init>(JspRuntimeContext.java:153)
	at org.apache.jasper.servlet.JspServlet.init(JspServlet.java:132)
	at 
org.apache.cocoon.components.jsp.JSPEngineImpl.executeJSP(JSPEngineImpl.java:71)

I did remote debugging to find out what caused the ClassCastException. 
After I have found the correct Tomcat sources - what a hell - I found 
the reason:
http://cvs.apache.org/viewcvs.cgi/jakarta-tomcat-jasper/jasper2/src/share/org/apache/jasper/compiler/JspRuntimeContext.java?annotate=1.4.2.5&only_with_tag=TOMCAT_4_1_24#151
The code does: Thread.currentThread().getContextClassLoader() and tries 
to cast it to URLClassLoader. While it does not fail for "hello.jsp" 
(classloader is of type WebappClassLoader) it fails for "jspflow" 
(classloader is of type CompilingClassLoader).

What do you suggest for fixing it? Is it possible to let our 
CompilingClassLoader extend URLClassLoader? Or shall we hint to Tomcat 
community that there are also other classloaders? Shall the JSPEngine 
restore a "normal" classloader?

Joerg

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