InstantiationException with PythonHitCollector

[Max Lynch]

Hi, I am trying to subclass lucene.PythonHitCollector to use the
HitCollector features of Lucene, but I get this error:

  File "/home/max/test/spider/src/ras/spider/spider.py", line 812, in
__init__
    super(lucene.PythonHitCollector, self).__init__()
lucene.JavaError: java.lang.InstantiationException:
org.apache.lucene.search.HitCollector

The class I am using:

class MyHitCollector(lucene.PythonHitCollector):
    def __init__(self):
        super(lucene.PythonHitCollector, self).__init__()

    def collect(doc, score):
        print "Collecting doc %d" % doc
        return


I thought that this would work fine if I used the PythonHitCollector instead
of the HitCollector.  Is there something else I need to do?

Thanks,
Max