After upgrading to WebSphere 8.5 I've experienced some incompatibilites in my JSF application. It is possible that they were caused by uncanonical use of JSF components, but I wanted to simply check what version is used
According to that document: http://pic.dhe.ibm.com/infocenter/wasinfo/v8r5/index.jsp?topic=%2Fcom.ibm.websphere.nd.doc%2Fae%2Frovr_specs.html WebSphere 8.5 uses Apache MyFaces 2.0.x (without specifying the version).
I was searching for myfaces*.jar withing WebSphere installation folder - nothing was found.
What version of MyFaces is WebSphere 8.5 using? How to find that jar withing WebSphere installation? Optionally, is it possible to replace it?
You could add your own myfaces implementation and load that one instead. Therefor you would have to change the classloader and set it to PARENT_LAST.
Older versions showed the installed JSF version during JSF initalization, however IBM probably has a customized JSF version anyways.
来源：https://stackoverflow.com/questions/18141728/how-to-check-replace-the-myfaces-version-used-by-websphere-8-5