Memory problem were reported https://community.jboss.org/message/804026#804026

At present, KB builder scans for facelet taglibs everywhere in jar files, not only in META-INF folder. That results in complete loading of model objects for jar content, which otherwise would remain unloaded. Once loaded, it is not easy to release them, since objects are shared by projects referencing the same jar.

Complete scanning was implemented as fix for https://issues.jboss.org/browse/JBIDE-5764 in February 2010.
JSF implementation jsf-impl-2.0.1.jar contains facelet tag libraries in /com/sun/faces/metadata/taglib.
However, it is recommended that facelet taglib xml files be packaged into META-INF folder. It seems that jsf-impl-2.0.1.jar is a special case. I suggest that we stop doing complete scanning of all jars and do it only for JSF 2 implementation jar.