java - com.sun.faces.application.view.FaceletViewHandlingStrategy handleRenderException -

java - com.sun.faces.application.view.FaceletViewHandlingStrategy handleRenderException -

i trying deploy paper website. works fine main page (list of articles) when click on 1 of them, go article page, exception:

oct 31, 2014 11:41:35 com.sun.faces.application.view.faceletviewhandlingstrategy handlerenderexception severe: error rendering view[/noticia.xhtml] java.lang.nullpointerexception @ java.net.urlencoder.encode(unknown source) @ com.sun.faces.context.urlbuilder.addvaluestoparameter(urlbuilder.java:318)

i using maven , tomcat 7.0.

full stacktrace: http://pastebin.com/qjzaypll

noticia.xhtml: http://pastebin.com/xgy7cmqw

frontpagemb: http://pastebin.com/fbtnqphp

pom.xml: http://pastebin.com/0ekp6fr2

web.xml: http://pastebin.com/eeymsm1f

java spring maven jsf managed-bean