Ajax4jsf in JSF 2.1 myfaces - jsf

Question

Our team is upgrading my very big Webapplication from Myfaces-1.1.5 to Myfaces-2.1.9
and from Tomahawk-1.1.3 to Tomahawk-1.1.14.
Problem is my current application using ajax4jsf filter..
<context-param>
<param-name>org.ajax4jsf.VIEW_HANDLERS</param-name>
<param-value>com.sun.facelets.FaceletViewHandler</param-value>
</context-param>
<filter>
<filter-name>ajax4jsf</filter-name>
<filter-class>org.ajax4jsf.Filter</filter-class>
</filter>
I have changed the value of context param as follows
<context-param>
<param-name>org.ajax4jsf.VIEW_HANDLERS</param-name>
<param-value>org.apache.myfaces.view.facelets.FaceletViewHandler</param-value>
</context-param>
Because of this I am getting exception. I have read at multiple places that with JSF 2.1, ajax4jsf filter is not required but could you please tell what should I use and how...
Feb 26, 2015 4:45:48 PM org.apache.myfaces.view.facelets.compiler.TagLibraryConf
ig loadImplicit
SEVERE: Error Loading Library: jar:file:/C:/Projects/eMessaging/EM1.4M6-LibUpgra
de_new/web/target/emessaging-webapp-1.4M6/WEB-INF/lib/ajax4jsf-1.0.6.jar!/META-I
NF/a4j.taglib.xml
java.io.IOException: Error parsing [jar:file:/C:/Projects/eMessaging/EM1.4M6-Lib
Upgrade_new/web/target/emessaging-webapp-1.4M6/WEB-INF/lib/ajax4jsf-1.0.6.jar!/M
ETA-INF/a4j.taglib.xml]:
at org.apache.myfaces.view.facelets.compiler.TagLibraryConfig.create(Tag
LibraryConfig.java:805)
at org.apache.myfaces.view.facelets.compiler.TagLibraryConfig.loadImplic
it(TagLibraryConfig.java:839)
at org.apache.myfaces.view.facelets.compiler.Compiler.initialize(Compile
r.java:101)
at org.apache.myfaces.view.facelets.compiler.Compiler.compile(Compiler.j
ava:126)
at org.apache.myfaces.view.facelets.impl.DefaultFaceletFactory._createFa
celet(DefaultFaceletFactory.java:300)
at org.apache.myfaces.view.facelets.impl.DefaultFaceletFactory.access$00
0(DefaultFaceletFactory.java:53)
at org.apache.myfaces.view.facelets.impl.DefaultFaceletFactory$1.newInst
ance(DefaultFaceletFactory.java:114)
at org.apache.myfaces.view.facelets.impl.DefaultFaceletFactory$1.newInst
ance(DefaultFaceletFactory.java:111)
at org.apache.myfaces.view.facelets.impl.FaceletCacheImpl.getFacelet(Fac
eletCacheImpl.java:83)
at org.apache.myfaces.view.facelets.impl.FaceletCacheImpl.getFacelet(Fac
eletCacheImpl.java:50)
at org.apache.myfaces.view.facelets.impl.DefaultFaceletFactory.getFacele
t(DefaultFaceletFactory.java:199)
at org.apache.myfaces.view.facelets.impl.DefaultFaceletFactory.getFacele
t(DefaultFaceletFactory.java:182)
at com.g1.emessaging.ui.EmsgFaceletViewHandler.buildView(EmsgFaceletView
Handler.java:550)
at com.g1.emessaging.ui.EmsgFaceletViewHandler.renderView(EmsgFaceletVie
wHandler.java:607)
at org.ajax4jsf.framework.ViewHandlerWrapper.renderView(ViewHandlerWrapp
er.java:101)
at org.ajax4jsf.framework.ajax.AjaxViewHandler.renderView(AjaxViewHandle
r.java:221)
at org.apache.myfaces.lifecycle.RenderResponseExecutor.execute(RenderRes
ponseExecutor.java:116)
at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:
241)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:199)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:208)
at org.ajax4jsf.framework.ajax.xmlfilter.BaseXMLFilter.doXmlFilter(BaseX
MLFilter.java:75)
at org.ajax4jsf.framework.ajax.xmlfilter.BaseFilter.doFilter(BaseFilter.