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NullPointerException с primefaces PickList

2013-04-23 2 views
3

я пытаюсь использовать PickList перетащить падение некоторых пользователей из одного списка в другой следующим образом:NullPointerException с primefaces PickList

<p:pickList id="employees" > 
    <f:selectItem itemLabel="Test User 1" itemValue="1" /> 
    <f:selectItem itemLabel="Test User 2" itemValue="2" /> 
    <f:selectItem itemLabel="Test User 3" itemValue="3" /> 
</p:pickList>

как в витрине

http://www.primefaces.org/showcase/ui/picklist.jsf

но я получаю исключение:

java.lang.NullPointerException 
    at org.primefaces.component.picklist.PickListRenderer.encodeMarkup(PickListRenderer.java:86) 
    at org.primefaces.component.picklist.PickListRenderer.encodeEnd(PickListRenderer.java:59) 
    at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:881) 
    at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:312) 
    at com.sun.faces.renderkit.html_basic.GridRenderer.renderRow(GridRenderer.java:185) 
    at com.sun.faces.renderkit.html_basic.GridRenderer.encodeChildren(GridRenderer.java:129) 
    at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:851) 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1779) 
    at javax.faces.render.Renderer.encodeChildren(Renderer.java:168) 
    at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:851) 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1779) 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782) 
    at org.primefaces.component.tabview.TabViewRenderer.encodeTabContent(TabViewRenderer.java:279) 
    at org.primefaces.component.tabview.TabViewRenderer.encodeContents(TabViewRenderer.java:237) 
    at org.primefaces.component.tabview.TabViewRenderer.encodeMarkup(TabViewRenderer.java:127) 
    at org.primefaces.component.tabview.TabViewRenderer.encodeEnd(TabViewRenderer.java:71) 
    at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:881) 
    at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:312) 
    at com.sun.faces.renderkit.html_basic.GroupRenderer.encodeChildren(GroupRenderer.java:105) 
    at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:851) 
    at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:304) 
    at com.sun.faces.renderkit.html_basic.GridRenderer.renderRow(GridRenderer.java:185) 
    at com.sun.faces.renderkit.html_basic.GridRenderer.encodeChildren(GridRenderer.java:129) 
    at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:851) 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1779) 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782) 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782) 
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:439) 
    at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:124) 
    at org.springframework.faces.webflow.FlowViewHandler.renderView(FlowViewHandler.java:99) 
    at com.ocpsoft.pretty.faces.application.PrettyViewHandler.renderView(PrettyViewHandler.java:163) 
    at org.springframework.faces.webflow.FlowViewHandler.renderView(FlowViewHandler.java:99) 
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120) 
    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:305) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
    at com.ocpsoft.pretty.PrettyFilter.doFilter(PrettyFilter.java:118) 
    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.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684) 
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:471) 
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:402) 
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:329) 
    at com.ocpsoft.pretty.PrettyFilter.doFilter(PrettyFilter.java:110) 
    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:224) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169) 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98) 
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:928) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) 
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987) 
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:539) 
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:298) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 
    at java.lang.Thread.run(Unknown Source) 
Apr 23, 2013 11:43:59 AM org.apache.catalina.core.StandardWrapperValve invoke 
SEVERE: Servlet.service() for servlet [default] in context with path [/PrimeTemplate] threw exception [null] with root cause 
java.lang.NullPointerException 
    at org.primefaces.component.picklist.PickListRenderer.encodeMarkup(PickListRenderer.java:86) 
    at org.primefaces.component.picklist.PickListRenderer.encodeEnd(PickListRenderer.java:59) 
    at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:881) 
    at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:312) 
    at com.sun.faces.renderkit.html_basic.GridRenderer.renderRow(GridRenderer.java:185) 
    at com.sun.faces.renderkit.html_basic.GridRenderer.encodeChildren(GridRenderer.java:129) 
    at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:851) 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1779) 
    at javax.faces.render.Renderer.encodeChildren(Renderer.java:168) 
    at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:851) 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1779) 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782) 
    at org.primefaces.component.tabview.TabViewRenderer.encodeTabContent(TabViewRenderer.java:279) 
    at org.primefaces.component.tabview.TabViewRenderer.encodeContents(TabViewRenderer.java:237) 
    at org.primefaces.component.tabview.TabViewRenderer.encodeMarkup(TabViewRenderer.java:127) 
    at org.primefaces.component.tabview.TabViewRenderer.encodeEnd(TabViewRenderer.java:71) 
    at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:881) 
    at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:312) 
    at com.sun.faces.renderkit.html_basic.GroupRenderer.encodeChildren(GroupRenderer.java:105) 
    at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:851) 
    at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:304) 
    at com.sun.faces.renderkit.html_basic.GridRenderer.renderRow(GridRenderer.java:185) 
    at com.sun.faces.renderkit.html_basic.GridRenderer.encodeChildren(GridRenderer.java:129) 
    at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:851) 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1779) 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782) 
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782) 
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:439) 
    at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:124) 
    at org.springframework.faces.webflow.FlowViewHandler.renderView(FlowViewHandler.java:99) 
    at com.ocpsoft.pretty.faces.application.PrettyViewHandler.renderView(PrettyViewHandler.java:163) 
    at org.springframework.faces.webflow.FlowViewHandler.renderView(FlowViewHandler.java:99) 
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120) 
    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:305) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
    at com.ocpsoft.pretty.PrettyFilter.doFilter(PrettyFilter.java:118) 
    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.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684) 
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:471) 
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:402) 
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:329) 
    at com.ocpsoft.pretty.PrettyFilter.doFilter(PrettyFilter.java:110) 
    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:224) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169) 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98) 
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:928) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) 
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987) 
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:539) 
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:298) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 
    at java.lang.Thread.run(Unknown Source)

, пожалуйста, сообщите, как исправить это, спасибо.

источник

2013-04-23 Mahmoud Saleh

+0

Попробуйте поместить его в 'h: form', если это не поможет попробовать более сложный пример, который включает в себя серверную часть (bean/properties), например' ' может быть некоторая ошибка в слишком упрощенном случае использования ... – Daniel

+0

@ Daniel, это уже внутри h: form, я думаю, проблема связана с f: selectItem –

ответ

4

Вы пытаетесь использовать его с классами pojo? Поэтому вам нужно определить свой собственный класс converter. Также почему вы используете f:selectItem? p:pickList уже имеет value свойство, которое предоставляет список для отображения. Также должны помочь itemLabelitemValue. Как и в витрине:

p:pickList id="pickList" value="#{pickListBean.cities}" var="city" 
       itemLabel="#{city}" itemValue="#{city}" />

О определении собственного класса преобразователя, эти вопросы могут помочь 1 и 2.

источник

2013-04-23 09:12:26

+0

Я пытался сделать статический выборщик для тестирования, но кажется, что picklist не работает с f: selectItem. –

+0

Возможно, это может быть сделано с функциями jstl, но это будет более сложно и бессмысленно, если сравнить его с обычным использованием. –

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