jaikiran: Very good point and a big mistake from me... Although it hasn't 
worked :/ .

The package of Xerces-J includes the following JARs:


  | resolver.jar
  | serializer.jar
  | xercesImpl.jar
  | xml-apis.jar
  | 

Before testing your idea, I thought that the lack of dependency libraries would 
return an exception of type "NoClassDefFound". Or maybe no errors even, since 
there wasn't any file in execution (it was just the deploying phase).

However, after reading your message twice, I think I got you and realized that 
maybe JBoss was combining the use of my version of "xercesImpl.jar" with 
non-matching versions of the rest of JARs. Unfortunately, I've added them too 
and I still get that error.

Something which is even more odd: I've decided to remove that JARs and use 
exactly the sames names and versions which are included in JBoss, in 
"lib/endorsed". Indeed, I've just copied and pasted them in my "lib" folder. 
And guess what? The same error occurs!!!

So this clarifies that it's not a matter of versions... By the way, the files 
are:


  | serializer.jar
  | xalan.jar
  | xercesImpl.jar
  | 

I've also tried to change the name of "lib" and modify the 
"META-INF/MANIFEST.MF" to point to the renamed folder ("liv" in this case). But 
it seems not to work:


  | Manifest-Version: 1.0
  | Class-Path: liv/serializer.jar liv/xalan.jar liv/xercesImpl.jar 
liv/mylib.jar
  | 
  | 
  | 

To check if it had worked, I've added a personal library (mylib.jar) to use 
this in a JSP file. No errors returned were in the deployment, but the JSP 
failed because it didn't find "mylib.jar".

After "googling" a little more I've seen that some servers, including JBoss, 
were already supporting the tag  inside of a tag , in the "application.xml" 
file:


  |     <module>
  |         <java>liv/serializer.jar</java>
  |     </module>
  |     <module>
  |         <java>liv/xalan.jar</java>
  |     </module>
  |     <module>
  |         <java>liv/xercesImpl.jar</java>
  |     </module>
  | 

The libraries have been loaded properly, but the deployment error came back. 
So, in other words, it doesn't matter if you just put "xercesImpl.jar" in the 
default directory ("lib") or you use an unofficial one and refer to it in 
"application.xml".

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