According to the javaee api doc, javax.faces.context.FacesContext should contain an isReleased method. However, looking at javaee API jar (http://download.java.net/maven/2/javax/javaee-api/6.0/), this seems to be missing.
http://docs.oracle.com/javaee/6/api/javax/faces/context/FacesContext.html#isReleased()
However, this is contained in the Mojarra JSF 2.1.26 implementation.
Any ideas/information?