XML toolkit or XERCES + XALAN in portal component Please HELP

Hello,
is there anybody that has succesfully used xalan and xerces in a portal component?
I have an application that requires them but have found no way to have them working in the restricted classloader area of portal component developed in java.
Best case my portal component still uses xml toolkit, worst case, when I try to add them as j2ee or irj libraries, portal does not even boot.
Help needed !
Thanks in advance
Vitaliano Trecca

Victor, Xavier is right.
I have already tried that but does not work. Classloader still finds SAP XML Toolkit factory. I also tried forcing System properties but things go even worst: it affects portal behaviour.
The only working way seems to be to load the parser implementation directly instead from the default factory but this is far from being a clean way.
Any suggestion to ensure my PDK will see Default factories from xerces and xalan and keep off from XMLToolkit?
Regards!
Vitaliano

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