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

Solution Unverified - Updated -

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)

Environment

  • Red Hat JBoss Enterprise Application Platform (EAP)
    • 7.x
    • 6.x
  • JSF 2.1

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase of over 48,000 articles and solutions.

Current Customers and Partners

Log in for full access

Log In
Close

Welcome! Check out the Getting Started with Red Hat page for quick tours and guides for common tasks.