jsf - Java.lang.ExceptionInInitializerError when adding omnifaces 1.4.1 to liferay project -

i using jsf 2.0 liferay , glassfish , primefaces 3.5.

i've read omnifaces , interesting.

i've added omnifaces 1.4.1 jar file liferay project in web-inf\lib.

an exception thrown after page rendered:

java.lang.exceptionininitializererror @ org.omnifaces.context.omn.partialviewcontext$omnipartialresponsewriter.startdocumnet(omnipartial view context.java)

is there configurations must add or missing something?

from 3rd paragraph of omnifaces homepage:

... note omnifaces not designed portlets.

liferay portlet environment. omnifaces designed servlet environments. exceptionininitializererror you're facing caused missing javax.servlet dependency should have been manifested noclassdeffounderror further down in stack trace.