[jdom-interest] XSLTransformer.transform method - thread safe?

Thu Nov 15 03:47:17 PST 2007

Micheal and Laurent,

Thanks for your resposes. I've rechecked my log files and I misread the
issue. It appears that my program has just managed to completely miss out
the transformation step on one of the threads.

Apologies for having wasted your time.

Yours,

Clint Redwood
Senior Solutions Architect - Boots Account
Xansa, a Steria company
t 0115 9595730 (Ext) 725730 (Int)
e clint.redwood at xansa.com
e clint.redwood at bcm-ltd.co.uk
http://www.xansa.com

             "Michael Kay"                                                 
             <mike at saxonica.co                                             
             m>                                                         To 
                                       <Clint.Redwood at xansa.com>,          
             15 November 2007          <jdom-interest at jdom.org>            
             11:27 GMT                                                  cc 

                                                                   Subject 
                                       RE: [jdom-interest]                 
                                       XSLTransformer.transform method -   
                                       thread safe?                        

The JDOM XSLTransformer class is really just a wrapper for a JAXP Templates
object, so it ought to be thread-safe. Bugs are always possible, but they
need evidence!

Note that when you do a Saxon transformation using this mechanism, it
copies
the input from a JDOM tree to a Saxon tree. It's also possible to do a
transformation using Saxon that operates on the JDOM tree without copying,
by creating a net.sf.saxon.jdom.DocumentWrapper and supplying that as the
Source object. (However, this won't always perform better - it depends what
the transformation is actually doing).

There's only been one multithreading bug detected in Saxon over the last
year [1], and that only affects XQuery.

Michael Kay
http://www.saxonica.com/

[1]
http://sourceforge.net/tracker/index.php?func=detail&aid=1673048&group_id=29

872&atid=397617

> -----Original Message-----
> From: jdom-interest-bounces at jdom.org
> [mailto:jdom-interest-bounces at jdom.org] On Behalf Of
> Clint.Redwood at xansa.com
> Sent: 15 November 2007 10:04
> To: jdom-interest at jdom.org
> Subject: [jdom-interest] XSLTransformer.transform method -
> thread safe?
>
> Hi,
>
> I've just had an XSL transform go VERY weird, and I think it
> may be that two threads tried to use the same XSLTransformer
> object at the same time.
> The result seemed to be that it returned the untransformed data.
>
> I'm using the Saxon 8.9 XSLT2.0 Engine, and also there are
> some SAXON-SQL queries in the XSLT in question.
>
> The Javadoc states that the XSLTransformer is thread safe,
> but I'm not sure if I've either found an issue with this, or
> if there's something not threadsafe in the Saxon implementation.
>
> Any suggestions as to how I could confirm this would be
> appreaciated as I've not done much in the way of
> multi-threaded debugging.
>
> Yours,
>
> Clint Redwood
> Senior Solutions Architect - Boots Account Xansa, a Steria
> company t 0115 9595730 (Ext) 725730 (Int) e
> clint.redwood at xansa.com e clint.redwood at bcm-ltd.co.uk
> http://www.xansa.com
>
>
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This email and any files transmitted with it are confidential and protected by client privilege.  It is solely for the use of the intended recipient.
Please delete it and notify the sender if you have received it in
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Any opinions expressed in this email are those of the individual and not
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     Xansa, Registered Office: 420 Thames Valley Park Drive,
     Thames Valley Park, Reading, RG6 1PU, UK.
     Registered in England No.1000954.
     t  +44 (0)8702 416181
     w  www.xansa.com