Getting a WfResource for a Group

The following code works fine if I want to assign an activity to an
individual user:

            	//set the assignment.
            	WfAssignmentIterator wfai =
currentActivity.get_iterator_assignment();
            	WfAssignment assignment = wfai.get_next_object();
            	WfResource currentResource 	= assignment.assignee();
            	System.out.println("This activity is currently assigned
to " + currentResource.resource_name());
            	WfResource newResource 	=
sharkExecutionAdministration.getResource("UserInGroupOne");
            	assignment.set_assignee(newResource);

But, if I try using similar code to try to get a group:

            	WfResource newResource 	=
sharkExecutionAdministration.getResource("GroupOne");

The resource is null.

I would like to be able to assign groups dynamically but without getting
a reference to the group, I can't figure out how to do so.

Any ideas or is there a different API call I should be using?

Thanks,
Greg
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