我在AccordionPanel中有一个Primefaces DataTable，带有动态数量的标签。通过单击列标题，可以按每列对DataTable进行排序。 更新行时，DataTable在Primefaces的DataTable类中抛出NullPointerException。只有在表之前已排序之后才会发生错误。 我在手风琴外测试了同一张桌子，并没有显示错误。
我做错了什么？
我的xhtml：
<ui:define name="content">
<h:form id="contentForm">
<p:accordionPanel id="wearDataAccordion" value="#{wearDataBean.wearDataTypes}" var="type" multiple="true">
<p:tab title="#{wearDataBean.getAggregateTypeLabel(type)}">
<p:dataTable width="100%" var="wearData" value="#{wearDataBean.getWearData(type)}" sortBy="#{wearData.aggregate.sequence}" sortOrder="ASCENDING"
scrollable="false" rowStyleClass="" styleClass="" emptyMessage="#{messages['lbl.no.data']}">
<p:column headerText="#{messages['lbl.weardata.label']}" sortBy="#{wearData.aggregate.sequence}" width="15%">
<p:outputLabel value="#{wearData.label}"/>
</p:column>
<p:column styleClass="column-numerical-right" headerText="#{messages['lbl.weardata.value']}"
sortBy="#{wearDataBean.getValue(wearData)}" width="5%">
<p:outputLabel value="#{wearDataBean.getValue(wearData)}" style="float:right"/>
</p:column>
<p:column headerText="#{messages['lbl.weardata.unit']}" sortBy="#{wearData.unitId}" width="10%">
<p:outputLabel value="#{wearDataBean.getUnitLabel(wearData.unitId)}"/>
</p:column>
<p:column headerText="#{messages['lbl.weardata.lastUpdate']}" sortBy="#{wearData.lastUpdate}" width="20%">
<p:outputLabel value="#{wearData.lastUpdate}">
<f:convertDateTime dateStyle="medium" timeStyle="medium" type="both" timeZone="#{localeData.timeZoneId}"/>
</p:outputLabel>
</p:column>
<p:column styleClass="column-button-icon" headerText="#{messages['lbl.dest.actions']}" width="7%">
<eae:commandButton icon="/resources/images/ui_content_dest_service.svg" styleClass="" svgStyleClass="ui-svg-button-icon-only-svg-size"
title="#{messages['lbl.weardata.reset']}" action="#{wearDataBean.reset(wearData)}" global="false">
<p:confirm header="#{messages['lbl.weardata.reset']}" message="#{messages['lbl.weardata.confirm.question']}" icon="ui-icon-alert" />
</eae:commandButton>
</p:column>
</p:dataTable>
</p:tab>
</p:accordionPanel>
<p:remoteCommand name="updateBean" actionListener="#{wearDataBean.updateData()}" global="false"/>
</h:form>
<p:socket onMessage="handleWearDataMessage" channel="#{messagePublisher.wearDataUpdateChannelName}"/>
<script type="text/javascript">
function handleWearDataMessage(data) {
var jsonString = JSON.stringify(data);
updateBean([{name: 'data', value: jsonString}]);
}
</script>
</ui:define>
它抛出的例外是：
13:20:47,060 [SEVERE] [org.primefaces.application.exceptionhandler.PrimeExceptionHandler] (default task-7) null: java.lang.NullPointerException
at org.primefaces.component.datatable.DataTable.findColumnInGroup(DataTable.java:903) [primefaces-5.1.14.jar:5.1.14]
at org.primefaces.component.datatable.DataTable.findColumn(DataTable.java:894) [primefaces-5.1.14.jar:5.1.14]
at org.primefaces.component.datatable.DataTable.getSortColumn(DataTable.java:1401) [primefaces-5.1.14.jar:5.1.14]
at org.primefaces.component.datatable.feature.SortFeature.singleSort(SortFeature.java:136) [primefaces-5.1.14.jar:5.1.14]
at org.primefaces.component.datatable.DataTableRenderer.preRender(DataTableRenderer.java:109) [primefaces-5.1.14.jar:5.1.14]
at org.primefaces.component.datatable.DataTableRenderer.encodeEnd(DataTableRenderer.java:83) [primefaces-5.1.14.jar:5.1.14]
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:919) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1863) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
at org.primefaces.component.accordionpanel.AccordionPanelRenderer.encodeTab(AccordionPanelRenderer.java:226) [primefaces-5.1.14.jar:5.1.14]
at org.primefaces.component.accordionpanel.AccordionPanelRenderer.encodeTabs(AccordionPanelRenderer.java:171) [primefaces-5.1.14.jar:5.1.14]
at org.primefaces.component.accordionpanel.AccordionPanelRenderer.encodeMarkup(AccordionPanelRenderer.java:103) [primefaces-5.1.14.jar:5.1.14]
at org.primefaces.component.accordionpanel.AccordionPanelRenderer.encodeEnd(AccordionPanelRenderer.java:76) [primefaces-5.1.14.jar:5.1.14]
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:919) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1863) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
at com.sun.faces.context.PartialViewContextImpl$PhaseAwareVisitCallback.visit(PartialViewContextImpl.java:582) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.component.visit.PartialVisitContext.invokeVisitCallback(PartialVisitContext.java:183) [jsf-impl-2.2.8-jbossorg-1.jar:]
at org.primefaces.component.api.UITabPanel.visitTree(UITabPanel.java:948) [primefaces-5.1.14.jar:5.1.14]
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
at javax.faces.component.UIForm.visitTree(UIForm.java:371) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
at com.sun.faces.context.PartialViewContextImpl.processComponents(PartialViewContextImpl.java:403) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.context.PartialViewContextImpl.processPartial(PartialViewContextImpl.java:322) [jsf-impl-2.2.8-jbossorg-1.jar:]
at org.primefaces.context.PrimePartialViewContext.processPartial(PrimePartialViewContext.java:60) [primefaces-5.1.14.jar:5.1.14]
at javax.faces.context.PartialViewContextWrapper.processPartial(PartialViewContextWrapper.java:219) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
at javax.faces.component.UIViewRoot.encodeChildren(UIViewRoot.java:1004) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:430) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:133) [jsf-impl-2.2.8-jbossorg-1.jar:]
at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) [jsf-impl-2.2.8-jbossorg-1.jar:]
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219) [jsf-impl-2.2.8-jbossorg-1.jar:]
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:647) [jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8]
at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:130) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.websockets.jsr.JsrWebSocketFilter.doFilter(JsrWebSocketFilter.java:129) [undertow-websockets-jsr-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:60) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:132) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:85) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:61) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:56) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.server.handlers.DisableCacheHandler.handleRequest(DisableCacheHandler.java:33) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.security.handlers.AuthenticationConstraintHandler.handleRequest(AuthenticationConstraintHandler.java:51) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:45) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:63) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.security.ServletSecurityConstraintHandler.handleRequest(ServletSecurityConstraintHandler.java:56) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:58) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:70) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.security.handlers.SecurityInitialHandler.handleRequest(SecurityInitialHandler.java:76) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:261) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:247) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:76) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:166) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.server.Connectors.executeRootHandler(Connectors.java:197) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:759) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_67]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_67]
at java.lang.Thread.run(Thread.java:745) [rt.jar:1.7.0_67]
支持bean的updateData()方法如下：
/**
* Refreshes the data within this bean
*/
public void updateData() {
this.logger.debug("Ajax listener method for wearDataUpdate called!");
// do update data
boolean refreshAll = false;
boolean refresh = false;
UpdateEvent<Integer> updateEvent = this.extractRequestData(new TypeToken<UpdateEvent<Integer>>() { /* ignored */ }.getType(), "data");
if (updateEvent.getType().equals(Type.CREATE)) {
refresh |= this.addWearDataToDomainData(updateEvent.getData());
} else if (updateEvent.getType().equals(Type.DELETE)) {
refresh |= this.removeWearDataFromDomainData(updateEvent.getData());
} else {
refreshAll = true;
}
// delete old data if refresh all is set
if (refreshAll) {
this.wearDataListsByType = null;
}
// update table in view
if (refresh || refreshAll) {
Ajax.update("contentForm:wearDataAccordion");
}
}
PrimeFaces 5.1.14，Omnifaces 2.0，WildFly 8.2.0
答案 0 :(得分：1)
解决方案是在数据表中使用widgetVar="data"。
Javascript必须识别此ID。
<p:dataTable width="100%" var="wearData" value="#{wearDataBean.getWearData(type)}" sortBy="#{wearData.aggregate.sequence}" sortOrder="ASCENDING"
scrollable="false" rowStyleClass="" styleClass="" emptyMessage="#{messages['lbl.no.data']}" widgetVar="data">
答案 1 :(得分：1)
我对accordionPanel标签中动态生成的数据广告的排序存在同样的问题，widgetVar解决方案无法解决我的问题。
使分类工作的解决方案是包含p:columnGroup（除了使事情有效之外没那么有用）
<p:columnGroup type="header">
<p:row>
<p:column headerText="Column 1">...</p:column>
...
</p:row>
</p:columnGroup>