LinkageError

[Duffiana Jones <cd...@polydeme.fr>]

Hi,

I'm facing troubles while attempting to execute classes using Digester
objects outside the struts framework : the error is
"java.lang.LinkageError: Class org/xml/sax/HandlerBase violates loader
constraints", and occurs when I attempt something like
"digester.parse(uri);" 

I've tried all following configurations :

* For all configurations
- Linux RH7.0 (+patch for the glibc)
-Tomcat (when used) 3.2
-Junit: 3.7
-Struts: 1.0


* Configurations 1
- jaxp1.0.1 / jaxp1.1
- xerces 1.2.3 / 1.3.0 / 1.4.1

* Configurations 2
- jaxp1.0.1 / jaxp1.1
- parser.jar (with jaxp1.0.1 distrib) or crimson.jar (with jaxp1.1
distrib)

* Configuration 3
the one that confuses me the most : I can run the Struts example
application using the libraries from the tomcat lib directory ... but I
can't run my application using the exact tomcat classpath (+ my own
classes)

* Configuration 4
I even recompiled the struts framework and then tried to run my app
using the exact same libs that were used at compile time (IMHO that
shoud have removed any LinkageError, as far as I understand this
message), and always get the same error.

* notice : I've tried with both final SUN releases of jdk1.2 and jdk1.3 

Given this, questions are :
- may the code itself (miscreated Digester object or other reasons I
can't figure out) causes the LinkageError, or can I be sure that's a
libraries related problem ?
- has anyone already used Digester objects outside the struts framework
(my need for doing this is to allow unit test with JUnit test runner,
but I can see many other reasons that may lead one to use the Digester
facilities outside struts), and if so, with which parsers and JAXP API
releases ?

I've checked the struts archives at covalent.net and
www.mail-archive.com (the pointers given at the jakarta resource page),
but didn't find anything related to this.

BTW I've seen in this list lot of posts about libs release number
troubles : for jaxp, xerces, and xalan, and even for ant for them who
want to compile the stuff themselves. IMHO, a summary about the faced
issues and the consistently working releases set would be of great
usage, and may even delete unusefull noise (as the one I'm making) from
the list. The struts documentation, is very nice about features and
architecture, appears somewhat vague about the prerequisites.

thanx for any idea.

duf.