Set required attribute of two h:selectManyCheckbox - ajax

Question

I have two h:selectManyCheckBox with the required attribute set to true.
What I want is that the required attribute of both of the components work together.
Only display the error message if and only if both of the selected items list are empty.
Right now my problem is that the message displays if either one of them is empty. Here's my code:
<rich:panel>
<f:facet name="header">
<h:outputText value="Actualización de catálogos"/>
</f:facet>
<h:panelGrid columns="4">
<h:outputLabel for="actualizarCatalogoPEC"
value="Actualizar catálogos PEC"/>
<h:selectBooleanCheckbox id="actualizarCatalogoPEC"
value="#{administrationBean.actualizaTodosPecChecked}">
<f:ajax event="click"
render="todosCatalogosPEC"/>
</h:selectBooleanCheckbox>
<h:outputLabel for="actualizarCatalogoSAGARPA"
value="Actualizar catálogos SAGARPA"/>
<h:selectBooleanCheckbox id="actualizarCatalogoSAGARPA"
value="#{administrationBean.actualizaTodosSagarpaChecked}">
<f:ajax event="click"
render="todosCatalogosSAGARPA"/>
</h:selectBooleanCheckbox>
<a4j:outputPanel id="todosCatalogosPEC">
<h:selectManyCheckbox id="selectCatalogosPEC"
disabled="#{administrationBean.actualizaTodosPecChecked}"
required="true"
value="#{administrationBean.catalogosPecSeleccionados}"
requiredMessage="Seleccione al menos un catálogo"
layout="pageDirection">
<f:selectItems value="#{administrationBean.catalogosPecOptions}"/>
</h:selectManyCheckbox>
</a4j:outputPanel>
<h:panelGroup/>
<a4j:outputPanel id="todosCatalogosSAGARPA">
<h:selectManyCheckbox id="selectCatalogosSAGARPA"
disabled="#{administrationBean.actualizaTodosSagarpaChecked}"
required="true"
value="#{administrationBean.catalogosSagarpaSeleccionados}"
requiredMessage="Seleccione al menos un catálogo"
layout="pageDirection" >
<f:selectItems value="#{administrationBean.catalogosSagarpaOptions}"/>
</h:selectManyCheckbox>
</a4j:outputPanel>
<h:panelGroup/>
<rich:message id="messageCatalogosPEC"
for="selectCatalogosPEC"/>
<h:panelGroup/>
<rich:message id="messageCatalogosSAGARPA"
for="selectCatalogosSAGARPA"/>
<h:panelGroup/>
<a4j:commandButton value="Actualizar catálogos"
render="messageCatalogosPEC"
action="#{administrationBean.doActualizaCatalogos}"/>
</h:panelGrid>
</rich:panel>
Cheers
UPDATE
I've changed my code as follows: (just added binding and modified required)
<a4j:outputPanel id="todosCatalogosPEC">
<h:selectManyCheckbox id="selectCatalogosPEC"
disabled="#{administrationBean.actualizaTodosPecChecked}"
binding="selectCatalogosPEC"
required="#{empty selectCatalogosSAGARPA.value}"
value="#{administrationBean.catalogosPecSeleccionados}"
requiredMessage="Seleccione al menos un catálogo"
layout="pageDirection">
<f:selectItems value="#{administrationBean.catalogosPecOptions}"/>
</h:selectManyCheckbox>
</a4j:outputPanel>
<h:panelGroup/>
<a4j:outputPanel id="todosCatalogosSAGARPA">
<h:selectManyCheckbox id="selectCatalogosSAGARPA"
binding="selectCatalogosSAGARPA"
disabled="#{administrationBean.actualizaTodosSagarpaChecked}"
required="#{empty selectCatalogosPEC.value}"
value="#{administrationBean.catalogosSagarpaSeleccionados}"
requiredMessage="Seleccione al menos un catálogo"
layout="pageDirection" >
<f:selectItems value="#{administrationBean.catalogosSagarpaOptions}"/>
</h:selectManyCheckbox>
</a4j:outputPanel>
but got this error:
jun 01, 2012 10:31:37 AM org.apache.catalina.core.StandardWrapperValve invoke
Grave: Servlet.service() for servlet [Faces Servlet] in context with path [/SRC_RichFaces] threw exception [java.lang.String cannot be cast to javax.faces.component.UIComponent] with root cause
java.lang.ClassCastException: java.lang.String cannot be cast to javax.faces.component.UIComponent
at com.sun.faces.application.ApplicationImpl.createComponentApplyAnnotations(ApplicationImpl.java:1941)
at com.sun.faces.application.ApplicationImpl.createComponent(ApplicationImpl.java:1144)
at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.createComponent(ComponentTagHandlerDelegateImpl.java:504)
at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.apply(ComponentTagHandlerDelegateImpl.java:157)
at javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:120)
at javax.faces.view.facelets.DelegatingMetaTagHandler.applyNextHandler(DelegatingMetaTagHandler.java:137)
at org.richfaces.view.facelets.html.BehaviorsAddingComponentHandlerWrapper.applyNextHandler(BehaviorsAddingComponentHandlerWrapper.java:53)
at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.apply(ComponentTagHandlerDelegateImpl.java:184)
at javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:120)
at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:98)
at javax.faces.view.facelets.DelegatingMetaTagHandler.applyNextHandler(DelegatingMetaTagHandler.java:137)
at org.richfaces.view.facelets.html.BehaviorsAddingComponentHandlerWrapper.applyNextHandler(BehaviorsAddingComponentHandlerWrapper.java:53)
at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.apply(ComponentTagHandlerDelegateImpl.java:184)
at javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:120)
at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:98)
at javax.faces.view.facelets.DelegatingMetaTagHandler.applyNextHandler(DelegatingMetaTagHandler.java:137)
at org.richfaces.view.facelets.html.BehaviorsAddingComponentHandlerWrapper.applyNextHandler(BehaviorsAddingComponentHandlerWrapper.java:53)
at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.apply(ComponentTagHandlerDelegateImpl.java:184)
at javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:120)
at javax.faces.view.facelets.DelegatingMetaTagHandler.applyNextHandler(DelegatingMetaTagHandler.java:137)
at org.richfaces.view.facelets.html.BehaviorsAddingComponentHandlerWrapper.applyNextHandler(BehaviorsAddingComponentHandlerWrapper.java:53)
at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.apply(ComponentTagHandlerDelegateImpl.java:184)
at javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:120)
at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:98)
at javax.faces.view.facelets.DelegatingMetaTagHandler.applyNextHandler(DelegatingMetaTagHandler.java:137)
at org.richfaces.view.facelets.html.BehaviorsAddingComponentHandlerWrapper.applyNextHandler(BehaviorsAddingComponentHandlerWrapper.java:53)
at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.apply(ComponentTagHandlerDelegateImpl.java:184)
at javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:120)
at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:98)
at com.sun.faces.facelets.compiler.NamespaceHandler.apply(NamespaceHandler.java:93)
at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:98)
at com.sun.faces.facelets.compiler.EncodingHandler.apply(EncodingHandler.java:86)
at com.sun.faces.facelets.impl.DefaultFacelet.apply(DefaultFacelet.java:152)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.buildView(FaceletViewHandlingStrategy.java:774)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:100)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:594)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:563)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:399)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:317)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:204)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:311)
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)

Answer 1

You need to bind them both to the view and in the required attribute of the first one, check if the UIInput#getSubmittedValue() of the second one is empty and in the required attribute of the second one, check if the UIInput#getValue() of the first one is empty.
<h:selectManyCheckbox
binding="#{selectCatalogosPEC}"
required="#{empty selectCatalogosSAGARPA.submittedValue}"
>
...
</h:selectManyCheckbox>
<h:selectManyCheckbox
binding="#{selectCatalogosSAGARPA}"
required="#{empty selectCatalogosPEC.value}"
>
....
</h:selectManyCheckbox>
See also:
JSF two required h:inputText (exclusive or)