javax.faces.FacesException: Cannot add the same component twice in JBoss EAP when dyanmically adding children in PreRenderViewEvent

Issue

• We are dynamically adding some child components to our custom component when the PreRenderViewEvent occurs, and getting the exception Cannot add the same component twice exception:

    public CustomComponent() {
        FacesContext context = FacesContext.getCurrentInstance();
        UIViewRoot root = context.getViewRoot();
        root.subscribeToViewEvent( PreRenderViewEvent.class, this );        
    }
    @Override
    public void processEvent(SystemEvent event) throws AbortProcessingException {          
        clearMyChildren(this);
        addMyChildren(this);     
    }
    @Override
    public boolean isListenerForSource(Object source) {        
        log.info("source: " + source);        
        return ( source instanceof UIViewRoot );
    }   

SEVERE [javax.enterprise.resource.webcontainer.jsf.context] (http-127.0.0.1:8080-1) javax.faces.FacesException: Cannot add the same component twice: form:top:example:my-repeat
    at com.sun.faces.context.StateContext$DynamicAddRemoveListener.handleAddRemoveWithAutoPrune(StateContext.java:751)
    at com.sun.faces.context.StateContext$DynamicAddRemoveListener.handleAdd(StateContext.java:678)
    at com.sun.faces.context.StateContext$AddRemoveListener.processEvent(StateContext.java:352)
    at com.sun.faces.context.StateContext$DynamicAddRemoveListener.processEvent(StateContext.java:568)
    at javax.faces.event.SystemEvent.processListener(SystemEvent.java:106)
    at com.sun.faces.application.ApplicationImpl.processListenersAccountingForAdds(ApplicationImpl.java:2215)
    at com.sun.faces.application.ApplicationImpl.invokeViewListenersFor(ApplicationImpl.java:2033)
    at com.sun.faces.application.ApplicationImpl.publishEvent(ApplicationImpl.java:292)
    at com.sun.faces.application.ApplicationImpl.publishEvent(ApplicationImpl.java:247)
    at javax.faces.component.UIComponentBase.publishAfterViewEvents(UIComponentBase.java:2203)
    at javax.faces.component.UIComponentBase.publishAfterViewEvents(UIComponentBase.java:2208)
    at javax.faces.component.UIComponentBase.publishAfterViewEvents(UIComponentBase.java:2216)
    at javax.faces.component.UIComponentBase.publishAfterViewEvents(UIComponentBase.java:2208)
    at javax.faces.component.UIComponentBase.publishAfterViewEvents(UIComponentBase.java:2216)
    at javax.faces.component.UIComponentBase.publishAfterViewEvents(UIComponentBase.java:2208)
    at javax.faces.component.UIComponentBase.doPostAddProcessing(UIComponentBase.java:1885)
    at javax.faces.component.UIComponentBase.setParent(UIComponentBase.java:405)
    at javax.faces.component.UIComponentBase$ChildrenList.add(UIComponentBase.java:2637)
    at javax.faces.component.UIComponentBase$ChildrenList.add(UIComponentBase.java:2609)
    at com.sun.faces.facelets.tag.jsf.ComponentSupport.addComponent(ComponentSupport.java:492)
    at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.addComponentToView(ComponentTagHandlerDelegateImpl.java:345)
    at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.addComponentToView(ComponentTagHandlerDelegateImpl.java:328)
    at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.apply(ComponentTagHandlerDelegateImpl.java:218)
    at javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:120)
    at com.sun.faces.facelets.tag.composite.ImplementationHandler.apply(ImplementationHandler.java:81)
    at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:95)
    at com.sun.faces.facelets.compiler.NamespaceHandler.apply(NamespaceHandler.java:93)
    at com.sun.faces.facelets.compiler.EncodingHandler.apply(EncodingHandler.java:87)
    at com.sun.faces.facelets.impl.DefaultFacelet.include(DefaultFacelet.java:320)
    at com.sun.faces.facelets.impl.DefaultFacelet.include(DefaultFacelet.java:379)
    at com.sun.faces.facelets.impl.DefaultFaceletContext.includeFacelet(DefaultFaceletContext.java:326)
    at org.jboss.examples.jsf.util.Components.includeCompositeComponent(Components.java:258)
    at org.jboss.examples.jsf.components.uirepeat.UIRepeatComponent.addMyChildren(UIRepeatComponent.java:93)
    at org.jboss.examples.jsf.components.uirepeat.UIRepeatComponent.processEvent(UIRepeatComponent.java:123)
    at javax.faces.event.SystemEvent.processListener(SystemEvent.java:106)
    at com.sun.faces.application.ApplicationImpl.processListenersAccountingForAdds(ApplicationImpl.java:2215)
    at com.sun.faces.application.ApplicationImpl.invokeViewListenersFor(ApplicationImpl.java:2033)
    at com.sun.faces.application.ApplicationImpl.publishEvent(ApplicationImpl.java:292)
    at com.sun.faces.application.ApplicationImpl.publishEvent(ApplicationImpl.java:247)
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:107)
    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:295)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:231)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:149)
    at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:169)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:150)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:97)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:102)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:854)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:656)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:926)
    at java.lang.Thread.run(Thread.java:745)