Question

How do I list a vector? How can I access the first key and the rest?

i can see the results

#{list vectorUser, as:'vu'}
       ${vu.key.name}</br>
        <li>${vu.????}</li>
#{/list}

Result

Group1
 Group1[17]=[User1 - User1, id - 13]
Group2
 Group2[14]=[User2 - User2, id - 15]

To show

TreeMap<Group,Vector<User>> g2u = getAll();
render(g2u);

Class User

public class name

Class Group

public class name

@ManyToManny
Public List<User> listUsers

Answer 1

<ul>
#{list groupList, as:'group'}
       ${group.key.name}

        #{list group.value, as:'listVector'}
             <br><li>${listVector.name}</li></br>
       #{/list}
#{/list}
</ul>

For the treemap

http://docs.oracle.com/javase/1.5.0/docs/api/java/util/TreeMap.html

For the vector

http://docs.oracle.com/javase/7/docs/api/java/util/Vector.html