[displaytag-user] InvocationTargetException while trying to use a decorator

[Melonie Brown]

I'm trying to replicate the view/edit/delete example on the ed hill 
website that uses a decorator to display the view /edit /delete options, 
but keep getting a "InvocationTargetException trying to fetch property 
userId on bean [EMAIL PROTECTED]"    If I remove the decorator, then 
the page displays without any problems.  I've looked at the examples and 
userList, but am still stuck.  Suggestions?

This is my object (of which I generate a list of) :

  private String parentId;
  private String userId;
  [getters / setters ]
and this is my jsp code:

<display:table  width="75%" name="users" requestURI="gotomodifyuser.do" 
decorator="foo.Wrapper" >
 <display:column property="userId" title="ID" />   
</display:table>

and this is the wrapper code (identical to example with link2 - just 
want to see it work on page):

public String getUserId()
{
       ListObject obj= (ListObject) this.getObject();
       int id= obj.getId();
       return "<a href=\"details.jsp?id="
           + id
           + "&action=view\">View</a> | "
           + "<a href=\"details.jsp?id="
           + id
           + "&action=edit\">Edit</a> | "
           + "<a href=\"details.jsp?id="
           + id
           + "&action=delete\">Delete</a>";
   }


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