JSF 2.1 Primefaces 5.2数据表编辑空指针异常

Question

我将JSF 2.1与JBOSS eap6.1 Primefaces 5.2一起使用

我想建立一个允许用户输入项目并将其添加到表中的网站。 当我超过表中的200个项目之后，性能就不再好了，因为每次添加之后，我都必须更新表以查看最近添加的项目。 但是现在我在达到230 ROWS之后更新表时遇到了NullPointerException异常，直到229行它都可以正常工作：

09:29:25,475 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/JETMealOrder].[Faces Servlet]] (http-localhost/127.0.0.1:8088-6) JBWEB000236: Servlet.service() for servlet Faces Servlet threw exception: java.lang.NullPointerException
    at com.sun.faces.context.PartialViewContextImpl.createPartialResponseWriter(PartialViewContextImpl.java:443) [jsf-impl-2.1.19-redhat-1.jar:2.1.19-redhat-1]
    at com.sun.faces.context.PartialViewContextImpl.access$300(PartialViewContextImpl.java:72) [jsf-impl-2.1.19-redhat-1.jar:2.1.19-redhat-1]
    at com.sun.faces.context.PartialViewContextImpl$DelayedInitPartialResponseWriter.getWrapped(PartialViewContextImpl.java:577) [jsf-impl-2.1.19-redhat-1.jar:2.1.19-redhat-1]
    at javax.faces.context.PartialResponseWriter.startDocument(PartialResponseWriter.java:115) [jboss-jsf-api_2.1_spec-2.1.19.1.Final-redhat-1.jar:2.1.19.1.Final-redhat-1]
    at org.primefaces.context.PrimePartialResponseWriter.startDocument(PrimePartialResponseWriter.java:146) [primefaces-5.2.jar:5.2]
    at com.sun.faces.context.AjaxExceptionHandlerImpl.handlePartialResponseError(AjaxExceptionHandlerImpl.java:199) [jsf-impl-2.1.19-redhat-1.jar:2.1.19-redhat-1]
    at com.sun.faces.context.AjaxExceptionHandlerImpl.handle(AjaxExceptionHandlerImpl.java:124) [jsf-impl-2.1.19-redhat-1.jar:2.1.19-redhat-1]
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:119) [jsf-impl-2.1.19-redhat-1.jar:2.1.19-redhat-1]
    at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:116) [jsf-impl-2.1.19-redhat-1.jar:2.1.19-redhat-1]
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118) [jsf-impl-2.1.19-redhat-1.jar:2.1.19-redhat-1]
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593) [jboss-jsf-api_2.1_spec-2.1.19.1.Final-redhat-1.jar:2.1.19.1.Final-redhat-1]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:295) [jbossweb-7.2.0.Final-redhat-1.jar:7.2.0.Final-redhat-1]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) [jbossweb-7.2.0.Final-redhat-1.jar:7.2.0.Final-redhat-1]
    at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:100) [primefaces-5.2.jar:5.2]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246) [jbossweb-7.2.0.Final-redhat-1.jar:7.2.0.Final-redhat-1]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) [jbossweb-7.2.0.Final-redhat-1.jar:7.2.0.Final-redhat-1]
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230) [jbossweb-7.2.0.Final-redhat-1.jar:7.2.0.Final-redhat-1]
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:149) [jbossweb-7.2.0.Final-redhat-1.jar:7.2.0.Final-redhat-1]
    at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:169) [jboss-as-web-7.2.0.Final-redhat-8.jar:7.2.0.Final-redhat-8]
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:145) [jbossweb-7.2.0.Final-redhat-1.jar:7.2.0.Final-redhat-1]
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:97) [jbossweb-7.2.0.Final-redhat-1.jar:7.2.0.Final-redhat-1]
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:102) [jbossweb-7.2.0.Final-redhat-1.jar:7.2.0.Final-redhat-1]
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:336) [jbossweb-7.2.0.Final-redhat-1.jar:7.2.0.Final-redhat-1]
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856) [jbossweb-7.2.0.Final-redhat-1.jar:7.2.0.Final-redhat-1]
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:653) [jbossweb-7.2.0.Final-redhat-1.jar:7.2.0.Final-redhat-1]
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:920) [jbossweb-7.2.0.Final-redhat-1.jar:7.2.0.Final-redhat-1]
    at java.lang.Thread.run(Thread.java:662) [rt.jar:1.6.0_45]

码：

 <p:dataTable tableStyle="width:auto" id="items" var="p" widgetVar="itemstbl" value="#{viewOrder.order.opNonMenus}" editMode="cell" editable="#{viewOrder.readonly==false}" rowKey="#{p.serial}" draggableRows="#{viewOrder.readonly==false}" sortBy="#{p.serial}"> <p:ajax event="rowReorder" update="form:items" listener="#{viewOrder.onRowReorder}" /> <f:facet name="header">Meal Order Details</f:facet> <p:column headerText="S.No." style="width:25px"> <h:outputText value="#{p.serial}" /> </p:column> <p:column headerText="Item Code"> <p:cellEditor> <f:facet name="output"> <h:outputText value="#{(p.withCode==1)? p.itemCode : '@FLP'}" /> </f:facet> <f:facet name="input"> <p:inputText value="#{p.itemCode}" id="code" onblur="value = value.toUpperCase()"> <p:ajax event="blur" update="items" listener="#{viewOrder.validateNonMenu(p)}" /> </p:inputText> </f:facet> </p:cellEditor> </p:column> <p:column headerText="Item Description"> <p:cellEditor> <f:facet name="output"> <h:outputText id="qdesc" value="#{p.itemDesc}" /> </f:facet> <f:facet name="input"> <p:inputTextarea value="#{p.itemDesc}" autoResize="true" cols="30" placeholder="Item Description" rows="1" /> </f:facet> </p:cellEditor> </p:column> <p:column headerText="Class"> <p:cellEditor> <f:facet name="output"> <h:outputText id="qclass" value="#{p.classCode.toUpperCase()}" /> </f:facet> <f:facet name="input"> <p:inputText value="#{p.classCode}" onblur="value = value.toUpperCase()" /> </f:facet> </p:cellEditor> </p:column> <p:column headerText="UOM"> <p:cellEditor> <f:facet name="output"> <h:outputText id="quom" value="#{p.uom}" /> </f:facet> <f:facet name="input"> <p:inputText value="#{p.uom}" onblur="value = value.toUpperCase()"> <p:ajax event="blur" update="form:items:0:code" /> </p:inputText> </f:facet> </p:cellEditor> </p:column> <p:column headerText="Group"> <p:cellEditor> <f:facet name="output"> <h:outputText id="qgrp" value="#{p.groupClass}" /> </f:facet> <f:facet name="input"> <p:autoComplete forceSelection="false" var="group" itemLabel="#{group}" itemValue="#{group}" value="#{p.groupClass}" completeMethod="#{viewOrder.completeQqcGroup}"> <f:facet name="itemtip"> <h:outputText value="#{group}" /> </f:facet> </p:autoComplete> </f:facet> </p:cellEditor> </p:column> <p:column headerText="Item Cost"> <p:cellEditor> <f:facet name="output"> <h:outputText value="#{p.purCost}" /> </f:facet> <f:facet name="input"> <p:inputText readonly="#{p.withCode==1}" onkeypress="var key = window.event ? event.keyCode : event.which; if (event.keyCode == 8 || event.keyCode == 46 || event.keyCode == 37 || event.keyCode == 39) return true; else if (key & lt; 48 || key & gt; 57) return false;" value="#{p.purCost}" /> </f:facet> </p:cellEditor> </p:column> <p:column headerText="Quantity"> <p:cellEditor> <f:facet name="output"> <h:outputText value="#{p.qtyItem}" /> </f:facet> <f:facet name="input"> <p:inputText onkeypress="var key = window.event ? event.keyCode : event.which; if (event.keyCode == 8 || event.keyCode == 46 || event.keyCode == 37 || event.keyCode == 39) return true; else if (key & lt; 48 || key & gt; 57) return false;" value="#{p.qtyItem}" /> </f:facet> </p:cellEditor> </p:column> <p:column style="width:32px;text-align: center" headerText="Image"> <p:commandButton update="form:cpsDetail" oncomplete="PF('cpsinfo').show()" icon="ui-icon-image" title="View Image"> <f:setPropertyActionListener value="#{p}" target="#{viewOrder.selectedItem}" /> </p:commandButton> </p:column> <p:column style="width:32px;text-align: center" headerText="Replace"> <p:commandButton rendered="#{viewOrder.readonly==false}" update="form:rrepotbl" icon="ui-icon-refresh" widgetVar="rplbtn" title="Replace Item" oncomplete="PF('rdlg').show();"> <f:setPropertyActionListener value="#{p}" target="#{viewOrder.replaceItem}" /> </p:commandButton> </p:column> <p:column style="width:32px;text-align: center" headerText="Replace by Menu"> <p:commandButton rendered="#{viewOrder.readonly==false}" update="form:rMrepotbl" icon="ui-icon-refresh" widgetVar="rplbtn" title="Replace Item" oncomplete="PF('rMdlg').show();"> <f:setPropertyActionListener value="#{p}" target="#{viewOrder.replaceItem}" /> </p:commandButton> </p:column> <p:column style="width:32px;text-align: center" headerText="Delete"> <p:commandButton rendered="#{viewOrder.readonly==false}" update="form:items" action="#{viewOrder.delete}" icon="ui-icon-close" title="Delete Item"> <f:setPropertyActionListener value="#{p}" target="#{viewOrder.selectedItem}" /> </p:commandButton> </p:column> </p:dataTable> 

public void addNewItem() {
        OpNonMenu item = new OpNonMenu();
        item.setDblDate(order.getDblDate());
        item.setFlightNoD(order.getFltNoD());
        item.setCustomerCode(cust.getCode());
        item.setMainSbdCode(order.getMainSbdCode());
        item.setSalesEditBy(log.getUserId());
        item.setSalesEditDate(order.getEditDate());

        item.setSerial(order.getOpNonMenus().size() + 1);
        item.setEditBy(order.getEditBy());
        item.setEditDate(order.getEditDate());
        item.setClassCode("");
        item.setWithCode(0);
        item.setItemCode("@FLP");
        item.setItemType("S");
        order.addOpNonMenu(item);
    }

Answer 1

我已经通过增加JBOSS服务器中standalone.xml中的最大计数属性来解决了空指针异常的问题

 <system-properties>
        <property name="org.apache.tomcat.util.http.Parameters.MAX_COUNT" value="10000"/>
</system-properties>

但是在没有增加行数之后，性能仍然会变差。