Jsf <；t：面板导航2>；原因javax.faces.FacesException:无法添加同一组件两次

我在WildFly 8.2.0上使用了JSF2.0的Tomahawk20 1.1.14。使用

时，会引发以下异常：

javax.faces.FacesException: Cannot add the same component twice

这是如何造成的，我如何解决？ 以下是堆栈跟踪：

Caused by: javax.faces.FacesException: Cannot add the same component twice: nav:panel-nav:nav_panel-nav_uinavmitem1
    at com.sun.faces.context.StateContext$DynamicAddRemoveListener.handleAddRemoveWithAutoPrune(StateContext.java:751) [jsf-impl-2.2.8-jbossorg-1.jar:]
    at com.sun.faces.context.StateContext$DynamicAddRemoveListener.handleAdd(StateContext.java:678) [jsf-impl-2.2.8-jbossorg-1.jar:]
    at com.sun.faces.context.StateContext$AddRemoveListener.processEvent(StateContext.java:352) [jsf-impl-2.2.8-jbossorg-1.jar:]
    at com.sun.faces.context.StateContext$DynamicAddRemoveListener.processEvent(StateContext.java:568) [jsf-impl-2.2.8-jbossorg-1.jar:]
    at javax.faces.event.SystemEvent.processListener(SystemEvent.java:108) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
    at javax.faces.event.ComponentSystemEvent.processListener(ComponentSystemEvent.java:118) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
    at com.sun.faces.application.ApplicationImpl.processListenersAccountingForAdds(ApplicationImpl.java:2239) [jsf-impl-2.2.8-jbossorg-1.jar:]
    at com.sun.faces.application.ApplicationImpl.invokeViewListenersFor(ApplicationImpl.java:2057) [jsf-impl-2.2.8-jbossorg-1.jar:]
    at com.sun.faces.application.ApplicationImpl.publishEvent(ApplicationImpl.java:292) [jsf-impl-2.2.8-jbossorg-1.jar:]
    at com.sun.faces.application.ApplicationImpl.publishEvent(ApplicationImpl.java:247) [jsf-impl-2.2.8-jbossorg-1.jar:]
    at org.jboss.as.jsf.injection.weld.ForwardingApplication.publishEvent(ForwardingApplication.java:299) [wildfly-jsf-injection-8.2.0.Final.jar:8.2.0.Final]
    at javax.faces.component.UIComponentBase.publishAfterViewEvents(UIComponentBase.java:2253) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
    at javax.faces.component.UIComponentBase.doPostAddProcessing(UIComponentBase.java:1934) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
    at javax.faces.component.UIComponentBase.setParent(UIComponentBase.java:447) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
    at org.apache.myfaces.custom.navmenu.htmlnavmenu.HtmlNavigationMenuRenderer.addUINavigationMenuItems(HtmlNavigationMenuRenderer.java:355) [tomahawk20-1.1.14.jar:1.1.14]
    at org.apache.myfaces.custom.navmenu.htmlnavmenu.HtmlNavigationMenuRenderer.preprocessNavigationItems(HtmlNavigationMenuRenderer.java:340) [tomahawk20-1.1.14.jar:1.1.14]
    at org.apache.myfaces.custom.navmenu.htmlnavmenu.HtmlNavigationMenuRenderer.encodeEnd(HtmlNavigationMenuRenderer.java:175) [tomahawk20-1.1.14.jar:1.1.14]
    at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:919) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1863) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
    at javax.faces.render.Renderer.encodeChildren(Renderer.java:176) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
    at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:889) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:456) [jsf-impl-2.2.8-jbossorg-1.jar:]
    at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:133) [jsf-impl-2.2.8-jbossorg-1.jar:]
    at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
    at org.apache.myfaces.tomahawk.application.ResourceViewHandlerWrapper.renderView(ResourceViewHandlerWrapper.java:169) [tomahawk20-1.1.14.jar:1.1.14]
    at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
    at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120) [jsf-impl-2.2.8-jbossorg-1.jar:]
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) [jsf-impl-2.2.8-jbossorg-1.jar:]
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219) [jsf-impl-2.2.8-jbossorg-1.jar:]
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:647) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
    ... 20 more

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将Wildfly降级为使用JSF 2.1.29-04（最新的2.1.x版本）会引发以下错误：

Caused by: java.lang.ClassNotFoundException: javax.faces.view.ViewScoped from [Module "org.jboss.as.jsf:main" from local module loader @15b3e5b (finder: local module finder @61ca2dfa (roots: /wildfly_8.2.0_final_acd/wildfly_8.2.0_final_acd/modules,/wildfly_8.2.0_final_acd/wildfly_8.2.0_final_acd/modules/system/layers/base))]
at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:213)
at org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:459)
at org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:408)
at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:389)
at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:134)
... 24 more

事实上，这个班级

javax.faces.view.ViewScoped

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jsf api中缺少。jar

Tomahawk for jsf 2.0与jsf 2.2不完全兼容。某些组件可能工作，但其他组件可能不工作。

就是这样。您面临的异常是动态组件树操作中的一个错误（以前用于解决跟踪编程组件树更改的旧JSF1.x错误）的结果

您有两种选择：

降级到JSF2.1/2.0。您可以使用与这里回答的相同的说明：您显然只会错过JSF2.2特定的特性

或者，放下战斧。MyFaces停止了战斧的开发（至少，它已经好几年没有维护了）。标准JSF中已经有很多实用程序/增强功能。对于可视化组件，寻找另一个UI组件库，或者只使用“普通香草”HTML/CSS（如果不考虑IE6／7作为支持的浏览器，那么菜单相对来说是微不足道的： UL>

<代码>和一点CSS）。

---

您忘记包含堆栈跟踪。它通常包含答案。堆栈跟踪现在已经存在。这似乎是旧的Tomahawk for JSF 2.0中的一个bug，只有在使用JSF 2.2时才会暴露。尝试根据将WildFly降级到Mojarra 2.1.x，然后重新测试。将WildFly降级到使用JSF 2.1.29-04（最新的2.1.x版本）会引发以下错误：原因：java.lang.ClassNotFoundException:javax.faces.view.ViewScoped，因为jar中缺少此错误。ViewScope类出现在jsf-api-2.2.0.jar中，这确实是自JSF2.2以来的新特性。如果您需要使用JSF2.2，那么您必须为JSF2.0放弃Tomahawk。当MyFaces停止了Tomahawk的开发时，我不会期望JSF2.2兼容版本的出现。这个建议非常有用。这就是我解决问题的方法。1） 将上下文参数org.jboss.jbossfaces.WAR\u BUNDLES\u JSF\u IMPL ti设置为true。2） 在war的WEB-INF/libs中使用tomahawk21-1.1.14.jar、jsf-api-2.1.0.jar和jaf-impl-2.1.0.jar。。web应用程序现在正在启动，可以显示index.xhtml页面。我现在有另一个问题。绑定到使用tomahawk的t:panelNavigation2构建的菜单项的actionlistener不会被触发。