Primefaces dataTable編輯nullPointerException

我目前有一個dataTable連接到數據庫。它一切正常，包括插入和刪除。然後我試圖添加編輯到我的DataTable，並突然我得到以下錯誤：Primefaces dataTable編輯nullPointerException

SEVERE: Servlet.service() for servlet [FacesServlet] in context with path [/ProEJT] threw exception [null] with root cause java.lang.NullPointerException at org.primefaces.component.celleditor.CellEditorRenderer.encodeEnd(CellEditorRenderer.java:38) at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1786) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782) at org.primefaces.component.datatable.DataTableRenderer.encodeCell(DataTableRenderer.java:823) at org.primefaces.component.datatable.DataTableRenderer.encodeRow(DataTableRenderer.java:784) at org.primefaces.component.datatable.DataTableRenderer.encodeRows(DataTableRenderer.java:699) at org.primefaces.component.datatable.DataTableRenderer.encodeTbody(DataTableRenderer.java:654) at org.primefaces.component.datatable.DataTableRenderer.encodeRegularTable(DataTableRenderer.java:249) at org.primefaces.component.datatable.DataTableRenderer.encodeMarkup(DataTableRenderer.java:211) at org.primefaces.component.datatable.DataTableRenderer.encodeEnd(DataTableRenderer.java:83) at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1786) at javax.faces.render.Renderer.encodeChildren(Renderer.java:168) at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:845) 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:437) at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:124) 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 org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:619)

據我所知，這並不其中NullPointerException異常來自於我的代碼告訴我。我嘗試了幾百萬種不同的東西，但沒有運氣。

我的dataTable：

 <h:form id="form1"> 
     <p:growl id="growl" showDetail="true" life="3000"/> 
     <p:dataTable id="dataTable" 
        var="order" 
        value="#{checkOut.orders}" 
        ajax="true" 
        paginator="true" 
        selection="#{checkOut.selectedOrder}" 
        selectionMode="single" 
        rowKey="#{order.id}" 
        rows="10" 
        sortMode="Multiple" 
        paginatorTemplate="{CurrentPageReport} {FirstPageLink} {PreviousPageLink} {PageLinks} {NextPageLink} {LastPageLink} {RowsPerPageDropdown}" 
        emptymessage="No orders found" 
        rowsPerPageTemplate="5,10,15" 
        rowStyleClass="#{(order.state == 'ERROR' ? 'error' : (order.state == 'Finished' ? 'finished' : (order.state == 'Failed' ? 'failed':(order.state == 'Paused' ? 'paused' : null))))}" 
        editable="true" 
        editMode="row"> 


       <f:facet name="header"> 
        Conversions 
       </f:facet> 

      <p:ajax event="rowEdit" listener="#{checkOut.onEdit}" update=":form:growl" /> 
      <p:ajax event="rowEditCancel" listener="#{checkOut.onCancel}" update=":form:growl"/> 

      <p:column sortBy="#{order.id}"> 
       <p:cellEditor > 
        <f:facet name="Output"> 
         <h:outputText value="#{order.id}"/> 
        </f:facet> 
        <f:facet name="Input"> 
         <p:inputText value="#{order.id}" style="width:100%"/> 
        </f:facet> 
       </p:cellEditor> 
      </p:column> 

      <p:column sortBy="#{order.created}" > 
       <p:cellEditor > 
        <f:facet name="Output"> 
         <h:outputText value="#{order.created}"/> 
        </f:facet> 
        <f:facet name="Input"> 
         <p:inputText value="#{order.created}" style="width:100%"/> 
        </f:facet> 
       </p:cellEditor> 
      </p:column> 

      <p:column sortBy="#{order.sender}" > 
       <p:cellEditor > 
        <f:facet name="Output"> 
         <h:outputText value="#{order.sender}"/> 
        </f:facet> 
        <f:facet name="Input"> 
         <p:inputText value="#{order.sender}" style="width:100%"/> 
        </f:facet> 
       </p:cellEditor> 
      </p:column> 

      <p:column sortBy="#{order.receiver}"> 
       <p:cellEditor > 
        <f:facet name="Output"> 
         <h:outputText value="#{order.receiver}"/> 
        </f:facet> 
        <f:facet name="Input"> 
         <p:inputText value="#{order.receiver}" style="width:100%"/> 
        </f:facet> 
       </p:cellEditor> 
      </p:column> 

      <p:column sortBy="#{order.input}" > 
       <p:cellEditor > 
        <f:facet name="Output"> 
         <h:outputText value="#{order.input}"/> 
        </f:facet> 
        <f:facet name="Input"> 
         <p:inputText value="#{order.input}" style="width:100%"/> 
        </f:facet> 
       </p:cellEditor> 
      </p:column> 

      <p:column sortBy="#{order.output}"> 
       <p:cellEditor > 
        <f:facet name="Output"> 
         <h:outputText value="#{order.output}"/> 
        </f:facet> 
        <f:facet name="Input"> 
         <p:inputText value="#{order.output}" style="width:100%"/> 
        </f:facet> 
       </p:cellEditor> 
      </p:column> 

      <p:column sortBy="#{order.state}"> 

       <p:cellEditor > 
        <f:facet name="Output"> 
         <h:outputText value="#{order.state}"/> 
        </f:facet> 
        <f:facet name="Input"> 
         <p:inputText value="#{order.state}" style="width:100%"/> 
        </f:facet> 
       </p:cellEditor> 
       <p:progressBar id="progressBarClient" value="#{checkOut.retrieveProgress(order.state)}" labelTemplate="{value}%" displayOnly="true"/> 
      </p:column> 

      <p:column > 
       <p:commandLink id="btnDeleteRow" action="#{checkOut.deleteRow(order)}" update="dataTable" ajax="true"> 
        <h:graphicImage value="/img/DeleteRed.png" style="align:center" width="30" height="30"/> 
       </p:commandLink> 
       <p:rowEditor /> 
      </p:column> 

     </p:dataTable> 
     <p:commandButton id="new" value="Create A New Order" update=":orderForm" oncomplete="newOrderDialog.show()" style="position:absolute; dataTable:10px; left:7px;"/> 
     <p:commandButton id="logout" value="Log Out" update="growl" action="#{checkOut.logout}" style="position:absolute; dataTable:10px; right:10px"/>    
    </h:form>

來源

2013-10-14 DaRoGa

只要看看[this]（http://www.primefaces.org/showcase/ui/datatableCellEditing.jsf）並找出與您的代碼的區別。 –

我使用Show Case行編輯示例來創建編輯，並再次查看它並看不到任何差異 – DaRoGa

我不認爲您在展示中執行了此代碼。我有一個普遍的看法（30秒），並看到一個重要的差異，可能會導致錯誤。只要看看它，你會注意到。順便說一下，據我所知，'dataTable'沒有'ajax'屬性。 –

使用輸入小的情況下&輸出面;

<f:facet name="output"> 
</f:facet> 

<f:facet name="input"> 
</f:facet>

來源

2013-10-14 09:36:23 Pushkar

謝謝普什卡。改變之後，重新將ajax =「true」添加到它現在可用的數據表中。 – DaRoGa

您最歡迎的DannyBoy。 @Xtreme Biker是對的，SSCCE在我們的實踐中非常重要。 – Pushkar

我已經過檢查，但無法解決它。還有其他設置嗎？ – Sarz

是的，有時候是因爲不是展櫃的例子，在我的例子中，我的窗口使用了相同的結構。

<p:cellEditor> 
    <f:facet name="output"><h:outputText value="#{car.id}" /></f:facet> 
    <f:facet name="input"><p:inputText id="modelInput" value="#{car.id}" style="width:96%"/></f:facet> 
</p:cellEditor>

來源

2015-09-23 01:00:23 user5365660

– user5365660

Primefaces dataTable編輯nullPointerException

回答

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