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Asked: 2026-06-01T10:41:43+00:00

I am learning RichFaces. Added a4j:commandButton to .xhtml. Below is my .xhtml code, <!DOCTYPE

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I am learning RichFaces. Added a4j:commandButton to .xhtml. Below is my .xhtml code,

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<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">
   <h:head>
   </h:head>

   <h:body>
    <h:form>
     <rich:panel>
         <h:panelGrid column="2">
            <h:inputText value="#{echoBean.name}"/>
            <h:outputText value="#{echoBean.name}" id="echoTxt" />
            <h:outputText value="Count" />
            <h:outputText id="countTxt" value="#{echoBean.count}" />
         </h:panelGrid>
         <a4j:commandButton value="Send" actionListener="#{echoBean.incrementCount}"  reRender="echoTxt, countTxt"/>
     </rich:panel>
     </h:form>
   </h:body>
</html>

I am using richfaces 4. So I have not given any a4j filters

But a4j:commandButton is not working. It is not doing any action on click. And no error in stack trace.

Am I missing something?

Thanks

Update:

I have replaced the the actionListener with action.
Now onclick of the button it throws the following exception,

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)

my managed Bean code is,

/**
*
*/

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();
    }   
}

I understand that it is related the state management problem. Is my guess correct? Am I miss anything else?

Thanks

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1 Answer

  1. Editorial Team

    You’re using actionListener for your command button, you should use action to make it work.

    <a4j:commandButton value="Send" action="#{echoBean.incrementCount}"
    reRender="echoTxt, countTxt"/>

    Plus, don’t forget to set the data you’re sending by adding the execute attribute tag. By default, it will submit all the form. You can find more info in the component documentation and you can refer to the online showcase.

    UPDATE:

    The name variable is null, that’s why its throwing that error. That’s because you’re using. This is because you’re doing this

    <h:inputText value="#{echoBean.name}"/>
<h:outputText value="#{echoBean.name}" id="echoTxt" />

    The echoBean.name is being setted twice in your bean, the first with the inputText value (the text you’ve entered) and the second time with the outputText value (null). If you want this behavior, you should really look on the showcase link I’ve added in my post and analyze how it must be done.

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