title: a4j:commandButton is not working. No action is taking place on click
body: <p>I am learning RichFaces. Added a4j:commandButton to .xhtml. Below is my .xhtml code,</p>
  
  <pre><code>&lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&gt;
  &lt;html xmlns="http://www.w3.org/1999/xhtml"
  xmlns:ui="http://java.sun.com/jsf/facelets"
  xmlns:h="http://java.sun.com/jsf/html"
  xmlns:f="http://java.sun.com/jsf/core"
  xmlns:rich="http://richfaces.org/rich"
  xmlns:a4j="http://richfaces.org/a4j"&gt;
     &lt;h:head&gt;
     &lt;/h:head&gt;
  
     &lt;h:body&gt;
      &lt;h:form&gt;
       &lt;rich:panel&gt;
           &lt;h:panelGrid column="2"&gt;
              &lt;h:inputText value="#{echoBean.name}"/&gt;
              &lt;h:outputText value="#{echoBean.name}" id="echoTxt" /&gt;
              &lt;h:outputText value="Count" /&gt;
              &lt;h:outputText id="countTxt" value="#{echoBean.count}" /&gt;
           &lt;/h:panelGrid&gt;
           &lt;a4j:commandButton value="Send" actionListener="#{echoBean.incrementCount}"  reRender="echoTxt, countTxt"/&gt;
       &lt;/rich:panel&gt;
       &lt;/h:form&gt;
     &lt;/h:body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>I am using richfaces 4. So I have not given any a4j filters</p>
  
  <p>But a4j:commandButton is not working. It is not doing any action on click. And no error in stack trace.</p>
  
  <p>Am I missing something?</p>
  
  <p>Thanks</p>
  
  <p><strong>Update:</strong></p>
  
  <p>I have replaced the the actionListener with action.
  Now onclick of the button it throws the following exception,</p>
  
  <pre><code>java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
      at java.util.ArrayList.rangeCheck(ArrayList.java:604)
      at java.util.ArrayList.get(ArrayList.java:382)
      at javax.faces.component.AttachedObjectListHolder.restoreState(AttachedObjectListHolder.java:165)
      at javax.faces.component.UIComponentBase.restoreState(UIComponentBase.java:1560)
      at com.sun.faces.application.view.StateManagementStrategyImpl$2.visit(StateManagementStrategyImpl.java:267)
      at com.sun.faces.component.visit.FullVisitContext.invokeVisitCallback(FullVisitContext.java:151)
      at javax.faces.component.UIComponent.visitTree(UIComponent.java:1590)
      at javax.faces.component.UIComponent.visitTree(UIComponent.java:1601)
      at javax.faces.component.UIForm.visitTree(UIForm.java:344)
      at javax.faces.component.UIComponent.visitTree(UIComponent.java:1601)
      at javax.faces.component.UIComponent.visitTree(UIComponent.java:1601)
      at com.sun.faces.application.view.StateManagementStrategyImpl.restoreView(StateManagementStrategyImpl.java:254)
      at com.sun.faces.application.StateManagerImpl.restoreView(StateManagerImpl.java:188)
      at com.sun.faces.application.view.ViewHandlingStrategy.restoreView(ViewHandlingStrategy.java:123)
      at com.sun.faces.application.view.FaceletViewHandlingStrategy.restoreView(FaceletViewHandlingStrategy.java:453)
      at com.sun.faces.application.view.MultiViewHandler.restoreView(MultiViewHandler.java:148)
      at javax.faces.application.ViewHandlerWrapper.restoreView(ViewHandlerWrapper.java:303)
      at com.sun.faces.lifecycle.RestoreViewPhase.execute(RestoreViewPhase.java:192)
      at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
      at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:116)
      at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
      at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
      at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
      at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
      at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
      at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
      at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
      at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:928)
      at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
      at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
      at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987)
      at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:539)
      at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:298)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
      at java.lang.Thread.run(Thread.java:722)
  </code></pre>
  
  <p>my managed Bean code is,</p>
  
  <p>/**
   * 
   */</p>
  
  <pre><code>package org.droidaceapps.src;
  
  import javax.faces.bean.ManagedBean;
  import javax.faces.bean.RequestScoped;
  import javax.faces.bean.SessionScoped;
  import javax.faces.event.ActionEvent;
  
  /**
   * @author yasodavenkat
   *
   */
  @ManagedBean(name="echoBean")
  @SessionScoped
  public class EchoBean {
  
      private String name;
      private int count;
  
      public String getName() {
          return name;
      }
  
      public void setName(String name) {
          this.name = name;
      }
  
      public int getCount() {
          return count;
      }
  
      public void setCount(int count) {
          this.count = count;
      }
  
      public EchoBean() {
      }
  
      public void incrementCount(ActionEvent e){
          count = name.length();
      }   
  }
  </code></pre>
  
  <p>I understand that it is related the state management problem. Is my guess correct? Am I miss anything else?</p>
  
  <p>Thanks</p>