SJSAS v9.0 : jsf-api 1.2 in javaee.jar causes trouble for jsf 1.1 apps

In Sun Java System Application Server v9.0 (or 9.1), jsf-api v1.2 is embeded in javaee.jar. This causes a lot of trouble when deploy web applications written with jsf v1.1. Is there a way to avoid this without modifying web applications to migrate to jsf v1.2? I got strong reasons/requirements not to migrating source to comply jsf v1.2.
In JSF v1.2 spec, it states "Faces 1.2 is backwards compatible with Faces 1.1. This means that a web-application that was developed to run with Faces 1.1 won�t require any modification when run with Faces 1.2 except in the cases described in the following section." Does anybody have the experience running v1.1 applications on top of SJSAS v9+ (or JSF v1.2 RI)? What are the best practices?
Thanks

It took me quite some time to diving in the codes as my situation is not simple - we have tens of custom coded JSF components/renders written in JSF v1.1 and suddently found everything not working on SJSAS v9. It turns out that I have to remove EVERY jar files related to JSF v1.1 or dependant by JSF v1.1, then it seems working but I couldn't be too sure untill the testing cycle finishes.
Thanks for the hint BalusC - it helps.

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SJSAS v9.0 : jsf-api 1.2 in javaee.jar causes trouble for jsf 1.1 apps

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