JSPDynPage with dynamically tree

Question

Hi,
I build a small tree dynamically in such a way and
get error "Error occurs during the rendering of jsp component."
What wrong do I make?
<%@taglib uri="tagLib" prefix="hbj"%>
<jsp:useBean id="myBean" scope="application" class="bean.TreeModel" />
<hbj:content id="myContext" >
  <hbj:page title="PageTitle"> Size = <%=myBean.list.size()%>
   <hbj:form id="form">
     <hbj:tree
        id="tree"
           title="System"
           >
     <%for ( int i = 0; i<= myBean.list.size(); i++)%>
           <hbj:treeNode
                    id="<%=i%>"
                    text="<%=myBean.list.get(i)%>"
                    isOpen="true"
           >
               <hbj:treeNode
                        id="Mandant<%=i%>"
                        text="Mandant 001"
                        isOpen="true"
               >
          </hbj:treeNode>
    <%}%>     
     </hbj:tree>       
</hbj:form>
  </hbj:page>
</hbj:content>
Regards
Raissa

Answer 1

If anyone runs into the same issue in future: this JSP implementation evaluates anything in <%=...%> type expressions, and calls toString() on the result. If the result is a primitive type, it can't call toString() - obviously. You also obviously can't call toString() manually, as the second questioner was trying to do.
In my experience, JSPs (or the JSP implementation used in HTMLB development - which, by the way, is not a complete or compliant implementation, by SAP's own admission) also tend to break when you try to perform evaluations in within <%=...%> expressions. For instance:
int i = 1;
<%="myTextLabel" + i%>
generally doesn't work, but:
int i = 1;
String id = "myTextLabel" + i;
<%=id%>
generally does, even though "myTextLabel" +++ i, when evaluated, is a string.