extending HTTPRequest

Hi,

I'm trying to modify a test recorded with the TCPProxy & HTTP filter so
that all HTTP failures fail the tests.

I thought I'd be as easy as extending HTTPRequest to raise an Exception
and use it in the createRequest() method, but I'm getting a
net.grinder.script.NonInstrumentableTypeException: The Jython instrumenters do not support selective instrumenters

I've been unable to gather from
http://grinder.sourceforge.net/g3/instrumentation.html#Selective+instrumentation
what the correct approach would be. Any ideas?

For the record, I'm modifying the generated script with:

class MyHTTPRequest(HTTPRequest):
    def __init__(self, url):
        # super(MyHTTPRequest, self).__init__()
        HTTPRequest.__init__(self)

    def processResponse(self, response):
        if response.getStatusCode >= 400:
            log("KO %(status)s: %(msg)s" %
                {"status": response.getStatusCode(), "msg": response.getText()})
            raise Exception(response.getText())

def createRequest(test, url, headers=None):
    """Create an instrumented HTTPRequest."""
    # request = HTTPRequest(url=url)
    request = MyHTTPRequest(url=url)
    if headers: request.headers = headers
    test.record(request, HTTPRequest.getHttpMethodFilter())
    return request

And this is the exception I'm getting:

net.grinder.script.NonInstrumentableTypeException: The Jython instrumenters do not support selective instrumenters
        at net.grinder.scriptengine.jython.instrumentation.dcr.AbstractJythonDCRInstrumenter.disallowSelectiveFilter(AbstractJythonDCRInstrumenter.java:183) ~[grinder-core-3.11.jar:na]
        at net.grinder.scriptengine.jython.instrumentation.dcr.AbstractJythonDCRInstrumenter.instrument(AbstractJythonDCRInstrumenter.java:167) ~[grinder-core-3.11.jar:na]
        at net.grinder.scriptengine.AbstractDCRInstrumenter.instrument(AbstractDCRInstrumenter.java:93) ~[grinder-core-3.11.jar:na]
        at net.grinder.scriptengine.CompositeInstrumenter.instrument(CompositeInstrumenter.java:103) ~[grinder-core-3.11.jar:na]

tks
-- 
pica

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