How to call ItemRegistry.getItemsByTag(Class<T> typeFilter, String... tags)?

Hi folks,

can anybody tell me how I can call this method in Jython? How to I get a class object for the first parameter? I tried the follwing code with no success:

   from org.openhab.core.items import GroupItem
   from org.eclipse.smarthome.core.items import GroupItem

itemRegistry.getItemsByTag(GroupItem.class, "some tag")