What extra argument is needed for java method call?

Hi,
there is a Java class called  "GroupServiceImpl":

    public class GroupServiceImpl extends DSpaceObjectServiceImpl<Group> implements GroupService

This class has mehod called "findByName":

    @Override
    public Group findByName(Context context, String name) throws SQLException {


So there are 2 arguments for that method.

I try to use this method like this (this is DSpace curator task):

class ConvertOldEmbargo(ScriptedTask):
    def init(self, curator, taskName):
        self.c = curator

    def performDso(self, dso):
        anonymous = GroupService.findByName(self.c.curationContext(), "Anonymous");

Jython complains:
TypeError: findByName(): expected 3 args; got 2

What is the third argument and how should I deliver it? Did I misunderstood something?

Any help much appreciated.

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