Tapestry 5.2在哪里定义类?

Failure writing parameter 'row' of component admin/Add:grid.rows: Failure writing parameter 'row' of component admin/Add:grid: Could not find a coercion from type com.foo.bar.pages.admin.Add$RolesRow to type com.foo.bar.pages.admin.Add$RolesRow.

我能想到的一个错误是毫无帮助的。我知道Tapestry希望您注入所有依赖项,但我还没有弄清楚使用什么模式来注入您将要动态实例化的类。

编辑:这是课程

   public static class RolesRow{
    @Property public Boolean ROLE_SUPER;
    @Property public Boolean ROLE_ADMIN;
    @Property public Boolean ROLE_USER;
    @Property public Boolean ROLE_VIEW;
    @Property public Boolean ROLE_EMAIL;
    private Map<String,Role> roles;
    public RolesRow(){

    }
    public RolesRow(Map<String,Role> roles){
        ROLE_SUPER = (roles.containsKey("ROLE_SUPER") ? true:false);
        ROLE_ADMIN = (roles.containsKey("ROLE_ADMIN") ? true:false);
        ROLE_USER =  (roles.containsKey("ROLE_USER") ? true:false);
        ROLE_VIEW =  (roles.containsKey("ROLE_VIEW") ? true:false);
        ROLE_EMAIL = (roles.containsKey("ROLE_EMAIL") ? true:false);
        this.roles = roles;
    }
    public List<Role> selected(){
        List<Role> r = new ArrayList<Role>();
        checked(r,"ROLE_SUPER",ROLE_SUPER);
        checked(r,"ROLE_ADMIN",ROLE_ADMIN);
        checked(r,"ROLE_USER",ROLE_USER);
        checked(r,"ROLE_VIEW",ROLE_VIEW);
        checked(r,"ROLE_EMAIL",ROLE_EMAIL);
        return r;
    }
    private void checked(List<Role> r,String field,Boolean obj){
        if (obj !=null && obj == true){
            r.add(roles.get(field));
        }

    }

我正在setupRender中实例化记录:

        void setupRender(){
         List<RolesRow> list = new ArrayList<RolesRow>();
     list.add(new RolesRow());