java.lang.NullPointerException 在 org.primefaces.model.BeanPropertyComparator.compare

Question

我正在使用 PrimeFaces 5.1 创建模型。 sortBy 功能抛出了一个 NPE。跟踪堆栈让我相信最初它需要数据表级别的默认 sortBy 属性。这是 XHTML。有人设法使用 PrimeFaces 5.1 数据表的 sortyBy 功能吗？

<?xml version='1.0' encoding='UTF-8' ?>
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:p="http://primefaces.org/ui">
    <h:head>
        <h:outputStylesheet library="default" name="css/newcss.css"/>
    </h:head>
    <h:body>
        <p:panel header="Application List" toggleable="true" toggleTitle="Toggler">
            <p:dataTable var="worker" value="#{workerPanel.workerList}"
                        >
                <p:column sortBy="#{worker.lastName}"
                          headerText="Last Name" 
                          styleClass="font12px"
                          >
                    <h:outputText value="#{worker.lastName}"/>
                </p:column>

堆栈跟踪：

Throwable javax.faces.FacesException: java.lang.NullPointerException
    at org.primefaces.model.BeanPropertyComparator.compare(BeanPropertyComparator.java:90)
    at java.util.TimSort.countRunAndMakeAscending(TimSort.java:324)
    at java.util.TimSort.sort(TimSort.java:189)
    at java.util.TimSort.sort(TimSort.java:173)
    at java.util.Arrays.sort(Arrays.java:659)
    at java.util.Collections.sort(Collections.java:217)
    at org.primefaces.component.datatable.feature.SortFeature.singleSort(SortFeature.java:147)
    at org.primefaces.component.datatable.feature.SortFeature.encode(SortFeature.java:105)
    at org.primefaces.component.datatable.DataTableRenderer.encodeEnd(DataTableRenderer.java:78)

Answer 1

简单地说 "h:form" 元素丢失了。就这些了。

java.lang.NullPointerException 在 org.primefaces.model.BeanPropertyComparator.compare

java.lang.NullPointerException at org.primefaces.model.BeanPropertyComparator.compare

sorting

jsf

nullpointerexception

primefaces

jsf-2