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Troubleshooting reportlab heisenbug

Using Django 1.4 / Python 2.7 / reportlab (open source version) to create pdf.

So far, everything has worked great. Previously, PDF generation (as in the requested HTTP requested / uploaded generated pdf file) was on Django 1.3 and was not open to the public. Improved and made a free feature on many pages and are now starting to experience problems.

I get "random" problems (since in some cases I see exceptions in the logs), but I could never reproduce the problems myself (which works most of the time).

I get the following type of error that always happens in pairs

    Exception Value: ParaParser instance has no attribute '_seq'
    Exception Location: /home/tss/lib/python2.7/reportlab-2.5-py2.7-linux-i686.egg/reportlab/platypus/paraparser.py in _complete_parse, line 1061

and then

    Exception Value: 'NoneType' object has no attribute 'close'
    Exception Location: /home/tss/lib/python2.7/reportlab-2.5-py2.7-linux-i686.egg/reportlab/lib/xmllib.py in close, line 521

Given that it is difficult for me to reproduce this and I'm not sure that the problem is on my side or reportlab - I am open to suggestions on how to fix this problem (maybe a synchronization problem, like in many cases, generating consistency or just a normal error or ...) ???

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Sent this question on the reportlab and Reportlab mailing list is not thread safe.

Thus, any use of Reportlab in which you get periodic problems and start a multi-threaded environment for web applications, because of this you will get really strange problems.

Now I need to figure out what to replace reportlab, hmm ....

/ Jens

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