super.refresh();
    public void refresh(){        super.refresh();        try{            final PluginManager mgr = InitialNaming.lookup(PluginManager.NAME);            PluginDescriptorModel pdm = (PluginDescriptorModel) mgr.getRegistry().getPluginDescriptor(pluginId);            if(pdm != null){                isvalid = false;                for(PluginDescriptorModel fdm : pdm.fragments()){                    if(fdm.getId().equals(fragmentId)){                        buffer = pdm.getJarFile().getBuffer();                        isvalid = buffer != null;                    }                }            } else {                isvalid = false;            }        } catch (NameNotFoundException e){            System.err.println(e);        }    }