Re: [Jython-users] Serializing Python objects which contain Java objects

[bradknox <bra...@cs...>]

. 
Alex Grönholm-3 wrote:
> 
> 28.1.2010 10:51, bradknox kirjoitti:
>> Hi guys. I can't make heads or tails of this.
>>
>> Class file WekaBatchInterfaceJ.java is contained in
>> WekaBatchInterfacePy.py,
>> which is at the bottom of a hierarchy of Python objects. I'd like to
>> serialize the top-level Python object, but there is a problem with
>> WekaBatchInterfaceJ.
>>
>>
>> When I try to use pickle.dump(), I get:
>>
>> TypeError: can't pickle WekaBatchInterfaceJ objects
>>
>>
>> And when I use Java io (as described in Part 9 at
>> http://www.oreillynet.com/pub/a/python/2002/04/11/jythontips.html?page=2),
>> I
>> can save the object instance without errors. But when I try to
>> unserialize
>> the object instance, I receive the following error:
>>
>> Traceback (most recent call last):
>>    File "PickleAgent.py", line 127, in<module>
>>      AgentLoader.loadAgent(PickleAgent())
>>    File "PickleAgent.py", line 75, in __init__
>>      self.mca = loadObject(agentFileName)
>>    File "PickleAgent.py", line 37, in loadObject
>>      readInstance = inStream.readObject( )
>> AttributeError: 'module' object has no attribute 'WekaBatchInterfaceJ'
>>
>> So you know, WekaBatchInterfaceJ does implement Serializable and all of
>> its
>> class variables either implement Serializable or are marked transient.
>>
>> Is it just not possible to accomplish this, or am I doing something
>> incorrectly? I'm trying to run some human subject experiments tomorrow,
>> so
>> any advice would be incredibly appreciated.
>>
>> - Brad Knox
>>    
> Use Pickle protocol 2:
> 
> pickle.dump(obj, file, 2)
> 
> The default protocol (level 0) is worthless.
> 
> 
> ------------------------------------------------------------------------------
> The Planet: dedicated and managed hosting, cloud storage, colocation
> Stay online with enterprise data centers and the best network in the
> business
> Choose flexible plans and management services without long-term contracts
> Personal 24x7 support from experience hosting pros just a phone call away.
> http://p.sf.net/sfu/theplanet-com
> _______________________________________________
> Jython-users mailing list
> Jyt...@li...
> https://lists.sourceforge.net/lists/listinfo/jython-users
> 
> 

Thanks, Alex, for the quick suggestion. Unfortunately, it also resulted in
an error (different than with the default protocol). I'd reproduce the error
for you, but I ended up saving the important information to file manually (a
bunch of arrays turned to strings), and I'd be tempting fate to mess with
the now-working code.

- Brad
-- 
View this message in context: http://old.nabble.com/Serializing-Python-objects-which-contain-Java-objects-tp27351810p27365969.html
Sent from the jython-users mailing list archive at Nabble.com.