When I try to create an object Material with a OneToMany link to an object B, this link is created through a factory function:
       

       @In(create=true)
        @Out(required=true)
        private Material material;

        @Factory("material")
        @SuppressWarnings("unchecked")
        public void createMaterial()

This function works fine, according to the log information I receive. However, the browser does not show the information of the link.
It seems that OneToMany relationships are not displayed, unless I add the following line to the top of my xhtml code:

       <c:if test="${!empty material}" />

Does anybody now why this is?