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RE: Calling Saxon from a CGI script

Subject: RE: Calling Saxon from a CGI script
From: "Bhaskar _" <bhaskarji@xxxxxxxxxxx>
Date: Fri, 22 Jun 2007 10:33:00 +0000
RE:  Calling Saxon from a CGI script
Thanks, Mike.

I have not used servlets or JAXP at all and have hardly done any programming in Java, so it might take me a while to figure out the solution you've proposed. Meanwhile, I decided to eliminate the parameters passed as command-line arguments to Saxon so as to transform the XML into HTML in the browser itself. When I tried doing so, I get the following error:

"Error during XSLT transformation: XSLT transformation failed."

I have tested the XSLT and am sure it works; and I have been able to use the browser to do the transformation with the previous version of this XSLT I had. The main (and am sure important) difference with this XSLT is it is conformant to XSLT 2.0 standards while the previous one was conformant to XSLT 1.0. That is, I am using for-each-group now instead of for-each loops and this is probably what's causing the error (my guess). Is this the source of the problem or is it something else? Please advise.

Thanks,
Bhaskar

----Original Message Follows----
From: "Michael Kay" <mike@xxxxxxxxxxxx>
Reply-To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
To: <xsl-list@xxxxxxxxxxxxxxxxxxxxxx>
Subject: RE:  Calling Saxon from a CGI script
Date: Wed, 20 Jun 2007 09:17:20 +0100

> I am using the Saxon processor for java to transform an XML
> into HTML. The XSL expects the user to provide two parameter
> values as command line arguments to Saxon. So, my call to
> Saxon is something like this:
> >java net.sf.saxon.Transform -o report.html report.xml report.xsl
> >param1=val1 param2=val2
>
> The values val1 and val2 are inputs in an HTML form and would
> be available at run-time in a CGI perl script. Once I get
> these values, I basically want to call Saxon as above to
> perform the transformation. I am trying to use the 'system'
> command inside the CGI perl script

You really don't want to do it that way. Loading and initializing a Java VM
just to run one transformation is not the way to do things in a web service
environment. (It can take 5 seconds to load the VM to run a 50ms
transformation.) Write a Java servlet that runs in a container such as
Tomcat which keeps the VM alive, and use the JAXP API to drive the
transformations. There's a "starter kit" servlet for doing this in the Saxon
distribution.

> but it doesn't work - I am
> seeing the following error in the webserver error logs:
>
> *** glibc detected *** java: free(): invalid pointer: 0xbfc7cbb8 ***,

Sorry, that's not an XSLT or Saxon problem, it's something to do with the
configuration of your web server.

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

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