org.primefaces.component.column.Column을 javax.faces.component.ActionSource에 캐스트 할 수 없습니다.

Question

요약 : 문서 목록이있는 다소 복잡한 JSF 양식을 개발 중이며 이제는 각 행에 버튼을 추가하려고합니다. 문서 파일을 다운로드 할 수 있습니다. Primefaces는 이에 대한 매력적인 솔루션을 제공하므로 전체 페이지를 점차적으로 primeface로 변환하지만 지금은 문서 테이블을 변환했습니다. 이것은 이상하게 보일지라도 잘 작동합니다. 내 문제는 내가 p:commandButton을 추가 할 때 예외가 발생한다는 것과 심지어 그것이 무엇을 의미하는지조차 알지 못한다는 것입니다. 제가 말할 수있는 한, 내가 발견 할 수 있었던 예를 따르고 있습니다. : 당신이 PrimeFaces showcase 보면

[2017-11-29T09:27:33.935+0000] [glassfish 5.0] [FATAL] [jsf.context.exception.handler.log] [javax.enterprise.resource.webcontainer.jsf.context] [tid: _ThreadID=31 _ThreadName=http-listener-1(5)] [timeMillis: 1511947653935] [levelValue: 1100] [[ 
    JSF1073: java.lang.ClassCastException caught during processing of RENDER_RESPONSE 6 : UIComponent-ClientId=, Message=org.primefaces.component.column.Column cannot be cast to javax.faces.component.ActionSource]] 

[2017-11-29T09:27:33.936+0000] [glassfish 5.0] [FATAL] [] [javax.enterprise.resource.webcontainer.jsf.context] [tid: _ThreadID=31 _ThreadName=http-listener-1(5)] [timeMillis: 1511947653936] [levelValue: 1100] [[ 
    org.primefaces.component.column.Column cannot be cast to javax.faces.component.ActionSource 
java.lang.ClassCastException: org.primefaces.component.column.Column cannot be cast to javax.faces.component.ActionSource 
     at org.primefaces.component.filedownload.FileDownloadTagHandler.apply(FileDownloadTagHandler.java:56) 
     at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:96) 
     at javax.faces.view.facelets.DelegatingMetaTagHandler.applyNextHandler(DelegatingMetaTagHandler.java:161) 
     at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.apply(ComponentTagHandlerDelegateImpl.java:203) 
     at javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:135) 
     at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:96) 
     at javax.faces.view.facelets.DelegatingMetaTagHandler.applyNextHandler(DelegatingMetaTagHandler.java:161) 
     at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.apply(ComponentTagHandlerDelegateImpl.java:203) 
     at javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:135) 
     at javax.faces.view.facelets.DelegatingMetaTagHandler.applyNextHandler(DelegatingMetaTagHandler.java:161) 
     at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.apply(ComponentTagHandlerDelegateImpl.java:203) 
     at javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:135) 
     at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:96) 
     at javax.faces.view.facelets.DelegatingMetaTagHandler.applyNextHandler(DelegatingMetaTagHandler.java:161) 
     at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.apply(ComponentTagHandlerDelegateImpl.java:203) 
     at javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:135) 
     at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:96) 
     at javax.faces.view.facelets.DelegatingMetaTagHandler.applyNextHandler(DelegatingMetaTagHandler.java:161) 
     at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.apply(ComponentTagHandlerDelegateImpl.java:203) 
     at javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:135) 
     at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:96) 
     at javax.faces.view.facelets.DelegatingMetaTagHandler.applyNextHandler(DelegatingMetaTagHandler.java:161) 
     at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.apply(ComponentTagHandlerDelegateImpl.java:203) 
     at javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:135) 
     at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:96) 
     at javax.faces.view.facelets.DelegatingMetaTagHandler.applyNextHandler(DelegatingMetaTagHandler.java:161) 
     at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.apply(ComponentTagHandlerDelegateImpl.java:203) 
     at javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:135) 
     at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:96) 
     at javax.faces.view.facelets.DelegatingMetaTagHandler.applyNextHandler(DelegatingMetaTagHandler.java:161) 
     at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.apply(ComponentTagHandlerDelegateImpl.java:203) 
     at javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:135) 
     at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:96) 
     at com.sun.faces.facelets.compiler.NamespaceHandler.apply(NamespaceHandler.java:94) 
     at com.sun.faces.facelets.compiler.EncodingHandler.apply(EncodingHandler.java:88) 
     at com.sun.faces.facelets.impl.DefaultFacelet.apply(DefaultFacelet.java:162) 
     at com.sun.faces.application.view.FaceletViewHandlingStrategy.buildView(FaceletViewHandlingStrategy.java:381) 
     at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:102) 
     at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100) 
     at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:223) 
     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:671) 
     at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1580) 
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:258) 
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160) 
     at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:652) 
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:591) 
     at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99) 
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155) 
     at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:371) 
     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:238) 
     at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:463) 
     at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:168) 
     at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:206) 
     at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:180) 
     at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:242) 
     at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119) 
     at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:284) 
     at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:201) 
     at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:133) 
     at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:112) 
     at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77) 
     at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:539) 
     at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112) 
     at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117) 
     at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56) 
     at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137) 
     at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:593) 
     at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:573) 
     at java.lang.Thread.run(Thread.java:745) 

Answer 1

, 당신은 것을 알 수 있습니다 : 여기

org.primefaces.component.column.Column cannot be cast to javax.faces.component.ActionSource 

테이블 세부

<h:form id="doclistform"> 
    <p:dataTable value="#{documentsController.documentList}" var="doclst" 
       id="doclist"> 
     <!-- innocent columns --> 
     <p:column> 
      <f:facet name="header"> 
       <h:outputText value="Download"/> 
      </f:facet> 
      <p:fileDownload value="#{doclst.docfile}"/> 
     </p:column> 
    </p:dataTable> 
</h:form> 

server.log에 예외는 있습니다 <p:fileDowload>은 <p:commandButton> 태그에 포함되어 있습니다. 파일 다운로드에는 다운로드를 시작하기위한 조치 소스 (언급 된 오류와 같은)가 필요합니다.

p:fileDownload을 p:commandButton으로 마무리하면됩니다.

<p:column> 
    <f:facet name="header"> 
     <h:outputText value="Download"/> 
    </f:facet> 
    <p:commandButton value="Download" ajax="false"> 
     <p:fileDownload value="#{doclst.docfile}"/> 
    </p:commandButton> 
</p:column> 

파일 다운로드와 취급을 확인하십시오

1. p:commandButton 것은이 ajax="false" 속성
2. p:fileDownload 값이 StreamedContent

File 객체가 아니라관련없는

다운로드하지만 p:column의 headerText 속성을 사용하여 코드를 단순화 할 수 있습니다

<p:column headerText="Download"> 
    <p:commandButton value="Download" ajax="false"> 
     <p:fileDownload value="#{doclst.docfile}"/> 
    </p:commandButton> 
</p:column>