java - how to get 1 attribut from groupcollection? -

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hi have sample example users , groups join manytomany . dont know how attribute of collectiongroup in users code :

<p:datatable var="user" value="#{usergestion.tableusers}" editable="true" >                               <p:column headertext="username" filtermatchmode="contains" filterby="#{user.username}">                                   <p:commandlink value="#{user.username}" action="#{usergestion.insertaaa()}"/>                            </p:column>                               <p:column headertext="nom" filtermatchmode="contains" filterby="#{user.nom}">                                   <h:outputtext value="#{user.nom}" />                              </p:column>                                <p:column headertext="groupe">                              <h:outputtext value="#{user.groupscollection.get(0).groupname}"  />                                                        </p:column>                          </p:datatable>

my user.groupscollection.get(0).groupname isnt working how can show group of user ?

solution :

user.groupscollection.toarray()[0].groupname

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