How to display many to many jpa collection in jsf?

Question

i made many to many join table between users and groups tables . so i have a collection in each entitie ( Users and groups )

@ManyToMany(mappedBy = \"usersCo         


        

Answer 1

You normally use an iterating component such as <ui:repeat> or <h:dataTable> to iterate over a collection. You can perfectly nest it inside another iterating component.

E.g.

<p:column headerText="groupe"> 
    <ui:repeat value="#{user.groupsCollection}" var="groups">
        <h:outputText value="#{groups.groupname}" /><br/>
    </ui:repeat>
</p:column>

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Unrelated to the concrete problem, you've there some poor naming convention. One group should be represented by a class named Group, not Groups. I suggest to rename the one and other so that the code becomes so much more self documenting:

<p:column headerText="groups"> 
    <ui:repeat value="#{user.groups}" var="group">
        <h:outputText value="#{group.name}" /><br/>
    </ui:repeat>
</p:column>

The plural s in the field/variable name should already be indicative that it concerns a collection.