PersistentFacesState method is throwing exeception

When I click this url "http://localhost:8080/web/guest/pages" , it goes to very first page i.e. page0 under the Page menu (Liferay Page). But my requirement, when i use url like http://localhost:8080/web/guest/pages?showPage=page3 , it should display the page3 instead of page0 under same Page menu (Liferay Page).
Here snapshot of portlet.xml and faces-config.xml. it tried with following code

 ServletRequest request = PageRequestUtil.getPortalRequest();
        String nextPage = request.getParameter("showPage");
        if (!StringUtils.isEmpty(nextPage)) {
            this.state.navigateTo("pag3");
            this.state.execute();
            this.state.render();
        }

I am getting following exception

Caused by: java.lang.NullPointerException: context
    at javax.faces.component.UIComponentBase.getClientId(UIComponentBase.java:194)
    at com.icesoft.faces.context.DOMContext.attachDOMContext(DOMContext.java:114)
    at com.icesoft.faces.renderkit.dom_html_basic.HiddenRenderer.renderEnd(HiddenRenderer.java:61)
    at com.icesoft.faces.renderkit.dom_html_basic.DomBasicRenderer.encodeEnd(DomBasicRenderer.java:128)
    at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:539)
    at com.icesoft.faces.application.D2DViewHandler.renderResponse(D2DViewHandler.java:528)
    at com.icesoft.faces.application.D2DViewHandler.renderResponse(D2DViewHandler.java:522)
    at com.icesoft.faces.application.D2DViewHandler.renderResponse(D2DViewHandler.java:522)
    at com.icesoft.faces.application.D2DViewHandler.renderResponse(D2DViewHandler.java:522)
    at com.icesoft.faces.facelets.D2DFaceletViewHandler.renderResponse(D2DFaceletViewHandler.java:282)

Here is snapshot of portlet.xml and faces-config.xml.

portlet.xml
<portlet>
 <portlet-name>Pages</portlet-name>
 <display-name>Pages</display-name>
 <portlet-class>com.icesoft.faces.webapp.http.portlet.MainPortlet</portlet-class>
 <init-param>
  <name>com.icesoft.faces.portlet.viewPageURL</name>
  <value>/jsp/page0.iface</value>
 </init-param>

</portlet>

faces-config.xml

<navigation-rule>
 <from-view-id>/jsp/page0.jsp</from-view-id>
 <navigation-case>
  <from-outcome>pag1</from-outcome>
  <to-view-id>/jsp/page1.jsp</to-view-id>
 </navigation-case>
 <navigation-case>
  <from-outcome>pag3</from-outcome>
  <to-view-id>/jsp/page3.jsp</to-view-id>
 </navigation-case>
</navigation-rule>
<navigation-rule>
 <from-view-id>/jsp/page1.jsp</from-view-id>
 <navigation-case>
  <from-outcome>pag2</from-outcome>
  <to-view-id>/jsp/page2.jsp</to-view-id>
 </navigation-case>
</navigation-rule>
<navigation-rule>
 <from-view-id>/jsp/page2.jsp</from-view-id>
 <navigation-case>
  <from-outcome>pag3</from-outcome>
  <to-view-id>/jsp/page3.jsp</to-view-id>
 </navigation-case>

Please suggest me.

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PersistentFacesState method is throwing exeception

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