Working with Ivan's demonstration, and a more stressful version (see
tickethttp://bugs.jython.org/issue2609), I was unable to reproduce the
problem on my main dev box (Windows 10).
I'm thinking hardware multiprocessing might be a factor. Anyone with
lots of CPUs (and a different OS) like to take this on?
Jeff
On 22/07/2017 09:01, Ivan Ponomarev via Jython-dev wrote:
> Hello all!
>
> We are using jython heavily from Java application in multiple threads.
> This didn't cause any problems in 2.7.1b3 and earlier versions.
>
> After upgrading to 2.7.1 we faced the following: a simple call to
> datetime.strptime(...) or json.loads(...) can lead to
> "'org.python.modules.sre.MatchObject' object has no attribute..." error.
>
> As I suspect, this is related to the fact that RegexObject is not
> thread-safe anymore. It never was in Java, and never promised to be in
> Python, though in earlier versions of Jython this was possible:
>
> ##############################################
> import thread
> import re
> import time
> REGEX = re.compile('((?:foo|bar)+)(\d*)E?')
>
> def parse(line):
> m = REGEX.search(line)
> if m.groups():
> print m.group(1)
>
> thread.start_new_thread(parse,('foofoofoofoofoofoofoofoofoo234',))
> thread.start_new_thread(parse, ('foobarbarbarbarbarbarbarfoo4E',))
> ....
> thread.start_new_thread(parse, ('foobarbarbarbarbarbarbarfoo4E',))
> time.sleep(1)
> ###############################################
>
> In Jython 2.7.1 this (sometimes! you might need to run this script a
> couple of times) cause "'MatchObject' object has no attribute" errors.
>
> Instead of calling shared RegexObject one can simply do this:
>
> def printtime(time):
> print datetime.datetime.strptime(time, '%Y-%m-%dT%H:%M:%S')
> thread.start_new_thread(printtime, ('2017-07-01T11:11:11',))
> ...
> thread.start_new_thread(printtime, ('2017-07-01T11:11:11',))
>
>
> The same with json.loads.
>
> OK, we never share RegexObjects between threads in our code. But we
> cannot refuse to use json.loads and datetime.strptime!
>
> This became a major issue for us (http://bugs.jython.org/issue2609).
> What would you suggest? How can we help to solve this?
>
> Regards,
>
> Ivan Ponomarev
>
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