check user folder exists

Hi,

how can I check, that a user folder exists? I'm getting always false.

f.e.: pageManager.folderExists("_user/admin");

Another question is, how can I get the document root dir from 
PageManager or PortalAdministration or ...?

I have a servlet, which check something in jetspeed. This Servlet 
retrieves this jetspeed components:

         jsUserManager =
                 (UserManager) 
componentManager.getComponent("org.apache.jetspeed.security.UserManager");

         jsRoleManager =
                 (RoleManager) 
componentManager.getComponent("org.apache.jetspeed.security.RoleManager");

         jsGroupManager =
                 (GroupManager) 
componentManager.getComponent("org.apache.jetspeed.security.GroupManager");

         jsPageManager =
                 (PageManager) 
componentManager.getComponent("org.apache.jetspeed.page.PageManager");

         jsPortalAdmin =
                 (PortalAdministration) 
componentManager.getComponent("PortalAdministration");

But I can't find a method to get it.

kind regards,

Frank