无法使用过滤器显示 p:column 的水印文本

Unable to display watermark text for p:column with filter

我正在使用 Primefaces 6.2,我有一个 p:dataTable 具有以下结构:

<h:form id="infocenterform">
...
...
    <p:dataTable id="infocentertable" ...>
    ...
    ...
    <p:column id="infocenterthemacolumn" style="width: 60%;" filterBy="#{eintrag.thema}" headerText="Thema" filteredValue="#{marketingPagesController.filteredEintragList}" sortBy="#{eintrag.thema}" filterMatchMode="contains">

            <h:outputLink value="#{eintrag.file}" target="_blank" >
                <h:outputText value="#{eintrag.thema}"/>
            </h:outputLink>                                  

            <p:watermark for="@(#infocenterform\:infocentertable\:infocenterthemacolumn\:filter)" value="Search with a keyword" /> 

    </p:column>

水印文本未显示(页面呈现、过滤、排序等都正常)。我参考了此页面上人们为 PF 6.1 建议的水印语法: How to show water mark in filter in primefaces?

知道我做错了什么吗?

更新:此语法最终对我有用...但我不得不将双斜杠更改为单斜杠,如下所示:)

<p:watermark for="@(#infocenterform\:infocentertable\:infocenterthemacolumn\:filter)" value="Search with a keyword" />

(紧接着 post:Column Filter Watermark is Not Showing in PrimeFaces in 6.0.19 Onwards