can have only one child. If you have many child of facet label, wrap it in a .

h:column id="subject_column">
   name="header">
     value="Subject" id="sort_by_subjects"
                   action="#{xxx.sort}">
       id="sortBySubject" name="sortBy" value="SUBJECT"/>
    
    ${isAscending}
  
   value="#{email.emailSubject}"/>


Updated it like below:

 id="subject_column">
     name="header">
        
             value="Subject" id="sort_by_subjects"
                action="#{xxx.sort}">
                 id="sortBySubject" name="sortBy" value="SUBJECT"/>
            
            ${isAscending}
        
    
     value="#{email.emailSubject}"/>

ITPub博客

<f:facet> couldn't be displayed with many child

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