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Faces Servlet throws an exception: java.lang.IllegalStateException

I am trying to port an application from jsf 1.2 to 2.1. I wrote a sample front page and tried to access it. The following exception. Not sure what causes this problem. If you execute only this page (by deleting all the code and libraries associated with my project, this page will display correctly). Any help on what might cause this problem would be really helpful.

Servlet.service() for servlet Faces Servlet threw exception: java.lang.IllegalStateException: Header count exceeded allowed maximum: 128
    at org.apache.tomcat.util.http.MimeHeaders.createHeader(MimeHeaders.java:329) [jbossweb-7.0.10.Final.jar:]
    at org.apache.tomcat.util.http.MimeHeaders.addValue(MimeHeaders.java:347) [jbossweb-7.0.10.Final.jar:]
    at org.apache.coyote.Response.addHeader(Response.java:351) [jbossweb-7.0.10.Final.jar:]
    at org.apache.catalina.connector.Response.addHeader(Response.java:1110) [jbossweb-7.0.10.Final.jar:]
    at org.apache.catalina.connector.ResponseFacade.addHeader(ResponseFacade.java:502) [jbossweb-7.0.10.Final.jar:]
    at javax.servlet.http.HttpServletResponseWrapper.addHeader(HttpServletResponseWrapper.java:202) [jboss-servlet-api_3.0_spec-1.0.0.Final.jar:1.0.0.Final]
    at javax.servlet.http.HttpServletResponseWrapper.addHeader(HttpServletResponseWrapper.java:202) [jboss-servlet-api_3.0_spec-1.0.0.Final.jar:1.0.0.Final]
    at javax.servlet.http.HttpServletResponseWrapper.addHeader(HttpServletResponseWrapper.java:202) 
    at javax.servlet.http.HttpServletResponseWrapper.addHeader(HttpServletResponseWrapper.java:202) [jboss-servlet-api_3.0_spec-1.0.0.Final.jar:1.0.0.Final]
    at javax.servlet.http.HttpServletResponseWrapper.addHeader(HttpServletResponseWrapper.java:202) [jboss-servlet-api_3.0_spec-1.0.0.Final.jar:1.0.0.Final]
    at com.sun.faces.context.ExternalContextImpl.<init>(ExternalContextImpl.java:137) [jsf-impl-2.1.5-jbossorg-1.jar:2.1.5-SNAPSHOT]
    at com.sun.faces.context.ExternalContextFactoryImpl.getExternalContext(ExternalContextFactoryImpl.java:73) [jsf-impl-2.1.5-jbossorg-1.jar:2.1.5-SNAPSHOT]
    at com.sun.faces.context.FacesContextFactoryImpl.getFacesContext(FacesContextFactoryImpl.java:93) [jsf-impl-2.1.5-jbossorg-1.jar:2.1.5-SNAPSHOT]
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:583) [jboss-jsf-api_2.1_spec-2.0.0.Final.jar:2.0.0.Final]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329) [jbossweb-7.0.10.Final.jar:]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.10.Final.jar:]
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:734) [jbossweb-7.0.10.Final.jar:]
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:541) [jbossweb-7.0.10.Final.jar:]
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:479) [jbossweb-7.0.10.Final.jar:]
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:407) [jbossweb-7.0.10.Final.jar:]
    at com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:546) [jsf-impl-2.1.5-jbossorg-1.jar:2.1.5-SNAPSHOT]
    at com.sun.faces.application.view.JspViewHandlingStrategy.executePageToBuildView(JspViewHandlingStrategy.java:364) [jsf-impl-2.1.5-jbossorg-1.jar:2.1.5-SNAPSHOT]
    at com.sun.faces.application.view.JspViewHandlingStrategy.buildView(JspViewHandlingStrategy.java:154) [jsf-impl-2.1.5-jbossorg-1.jar:2.1.5-SNAPSHOT]
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:100) [jsf-impl-2.1.5-jbossorg-1.jar:2.1.5-SNAPSHOT]
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) [jsf-impl-2.1.5-jbossorg-1.jar:2.1.5-SNAPSHOT]
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139) [jsf-impl-2.1.5-jbossorg-1.jar:2.1.5-SNAPSHOT]
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:594) [jboss-jsf-api_2.1_spec-2.0.0.Final.jar:2.0.0.Final]
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2 answers

This problem was related to faces-config.xml. The title should be.

<faces-config version="2.0"
   xmlns="http://java.sun.com/xml/ns/javaee"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="
      http://java.sun.com/xml/ns/javaee
      http://java.sun.com/xml/ns/javaee/web-facesconfig_2_0.xsd">
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Include this tag in your head element as follows:

<h:head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</h:head>

Wiki explanation

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