Why jsp can't get the Vector fill with user-defined class by theRemote interface?

[Realove]

Because It is a big project so i provide a model to express my
question,
Qestion is:I want get the Vector full fill with the a Object in Jsp.
but I can't get it,There will problem when test return,but we I
Choose String but no class a 's object ,It can be return
successful.It
seems that jsp Can't recognize the class a,,but I really include the
Ejb module in jsp's lib.and editor alse prompt a's information.
I alse test it in JBoss server It alse occur Exception!
I cant understand why,
so come to here ask why?Please help me,3ks very much!!!

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I use Netbean 6.1,Glassfish.Ejb3
import javax.ejb.Stateless;


1.
@Stateless(mappedName="T")
public class vectorBean implements vectorRemote {
//Vector v;
//@PostConstruct
//public void Init(){v=new Vector}


public Vector test(){
Vector v=new Vector();
v.add(new a("alex",14));
return v; }
}


2. a is a simple class
public class a {
public String m;
public int n;


public a(String m, int n) {
this.m = m;
this.n = n;
}
getter,and setters!



}


3.Jsp
InitialContext ctx=new InitialContext();
//ShoppingCartRemote
s=(ShoppingCartRemote)ctx.lookup("shopcart");
vectorRemote s=(vectorRemote)ctx.lookup("T");
Vector v=s.test();
Enumeration e=v.elements();
while(e.hasMoreElements()){
a p=(a)e.nextElement();
out.println(p.m);
}