Question

我目前有一个连接数据库的dataTable。这一切都很好，包括插入和删除。然后我尝试将编辑添加到我的dataTable中，突然间我收到以下错误：

SEVERE：带有路径[/ ProEJT]的上下文中Servlet [FacesServlet]的Servlet.service（）使用根本原因抛出异常[null] 显示java.lang.NullPointerException at org.primefaces.component.celleditor.CellEditorRenderer.encodeEnd（CellEditorRenderer.java:38）在javax.faces.component.UIComponentBase.encodeEnd（UIComponentBase.java:875）在javax.faces.component.UIComponent.encodeAll（UIComponent.java:1786）在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）在org.primefaces.component.datatable.DataTableRenderer.encodeMarkup（DataTableRenderer.java:211） at org.primefaces.component.datatable.DataTableRenderer.encodeEnd（DataTableRenderer.java:83）在javax.faces.component.UIComponentBase.encodeEnd（UIComponentBase.java:875）在javax.faces.component.UIComponent.encodeAll（UIComponent.java:1786）在javax.faces.render.Renderer.encodeChildren（Renderer.java:168）在javax.faces.component.UIComponentBase.encodeChildren（UIComponentBase.java:845）在javax.faces.component.UIComponent.encodeAll（UIComponent.java:1779）在javax.faces.component.UIComponent.encodeAll（UIComponent.java:1782）在javax.faces.component.UIComponent.encodeAll（UIComponent.java:1782）在com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView（FaceletViewHandlingStrategy.java:437）在com.sun.faces.application.view.MultiViewHandler.renderView（MultiViewHandler.java:124） at com.sun.faces.lifecycle.RenderResponsePhase.execute（RenderResponsePhase.java:120）在com.sun.faces.lifecycle.Phase.doPhase（Phase.java:101）在com.sun.faces.lifecycle.LifecycleImpl.render（LifecycleImpl.java:139）在javax.faces.webapp.FacesServlet.service（FacesServlet.java:594）在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:305）在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:210）在org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:222）在org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:123）在org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:502） at org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:171）在org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:99）在org.apache.catalina.valves.AccessLogValve.invoke（AccessLogValve.java:953）在org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:118）在org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:408）在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）在java.lang.Thread.run（Thread.java:619）

据我所知，这并没有告诉我在我的代码中NullPointerException的来源。我尝试了一百万种不同的东西而没有运气。

我的数据表：

        <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>

Answer 1

使用输入和输入在小的情况下输出小平面;

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

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

Answer 2

是的，有时是因为不是展示的同一个例子，在我的情况下，我的窗口使用相同的结构。

<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>

Primefaces dataTable编辑nullPointerException

2 个答案: