this code is not working on richfaces 4 but it works on 3.3.3 (JSF 2) ,when i press the button nothing displyed or rerendered .
<?xml version='1.0' encoding='UTF-8' ?>
<!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:h="http://java.sun.com/jsf/html"
xmlns:a4j="http://richfaces.org/a4j"
xmlns:rich="http://richfaces.org/rich"
xmlns:f="http://java.sun.com/jsf/core">
<f:view>
<h:head>
<title>Facelet Title</title>
</h:head>
<h:body>
<h:form >
<rich:panel header="RichFaces Greeter" style="width: 315px">
<h:outputText value="Your name: " />
<h:inputText value="#{user.name}">
<f:validateLength minimum="1" maximum="30" />
</h:inputText>
<a4j:commandButton value="Get greeting" reRender="greeting" />
<h:panelGroup id="greeting">
<h:outputText value="Hello, " rendered="#{not empty user.name}" />
<h:outputText value="#{user.name}" />
<h:outputText value="!" rendered="#{not empty user.name}" />
</h:panelGroup>
</rich:panel>
</h:form>
</h:body>
</f:view>
</html>
Replace reRender with render.