could you configure  
public static void writeXml( Node n, OutputStream os )         throws 
TransformerException
 of org.apache.tomcat.util.DomUtil to trap TransformerFactoryConfigurationError
http://cupi2.uniandes.edu.co/site/images/recursos/javadoc/j2se/1.5.0/docs/api/javax/xml/transform/TransformerFactory.html#newTransformer%28javax.xml.transform.Source%29

it seems at minumum one of these conditions to be satisifed to properly 
newInstance the TransformerFactory ?

Use the javax.xml.transform.TransformerFactory system property. 
Use the properties file "lib/jaxp.properties" in the JRE directory. This 
configuration file is in standard java.util.Properties format and contains the 
fully qualified name of the implementation class with the key being the system 
property defined above. The jaxp.properties file is read only once by the JAXP 
implementation and it's values are then cached for future use. If the file does 
not exist when the first attempt is made to read from it, no further attempts 
are made to check for its existence. It is not possible to change the value of 
any property in jaxp.properties after it has been read for the first time. 
Use the Services API (as detailed in the JAR specification), if available, to 
determine the classname. The Services API will look for a classname in the file 
META-INF/services/javax.xml.transform.TransformerFactory in jars available to 
the runtime. 
Platform default TransformerFactory instance. 
 
?
Martin Gainty 
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> Date: Sun, 12 Sep 2010 16:01:26 +0200
> Subject: Re: Host Manager.
> From: wesley.ache...@gmail.com
> To: users@tomcat.apache.org
> 
> Okay I'm most of the way to a solution but I wouldn't mind if someone
> would take a look at a new WIP class and tell me what needs cleaning.
> Its not quite functional.
> 
> Anyone interested?
> 
> On Fri, Sep 3, 2010 at 4:44 AM, Wesley Acheson <wesley.ache...@gmail.com> 
> wrote:
> > Looked at that before not really convinced reworking that is easier
> > than adding in an xml line or two via an xml writer.
> >
> > Willing to be convinced though.
> >
> > Wes
> >
> > On 9/3/10, Pid <p...@pidster.com> wrote:
> >> On 02/09/2010 21:06, Caldarale, Charles R wrote:
> >>>> From: Wesley Acheson [mailto:wesley.ache...@gmail.com]
> >>>> Subject: Host Manager.
> >>>
> >>>> Is there is no documentation for the host-manager?
> >>>
> >>> Very little that I've found.  You can learn a bit about it by looking at
> >>> its WEB-INF/web.xml file.
> >>>
> >>>> If I remember correctly from this list it doesn't persist
> >>>> its settings is that correct?
> >>>
> >>> Correct.
> >>>
> >>>> How many people would be interested in it persisting its
> >>>> settings, by editing the appropriate files.
> >>>
> >>> I would be interested.  Note that there's only one file to edit:
> >>> conf/server.xml.
> >>>
> >>>> Is that in theory possible?
> >>>
> >>> It's all software...
> >>>
> >>>> to add the folder structure and the appropiate
> >>>> context.xml files.
> >>>
> >>> That's not necessary - the conf/Catalina/[host]/... files are already
> >>> created automatically as webapps are deployed under the new <Host>.  Only
> >>> conf/server.xml needs to be updated.
> >>>
> >>>> Would it interfere too badly with tomcat while
> >>>> it was running?
> >>>
> >>> No, Tomcat only reads server.xml during startup.  Whatever update
> >>> mechanism is used must insure that the file is never in an unparsable
> >>> state (e.g., don't update in place, instead create a new file and then
> >>> rename it).
> >>
> >> May I gently steer you in the direction of the JMX API and the
> >> Catalina:type=Server.Operations.storeConfig() command?
> >>
> >> Not sure it works very well at the moment, but if it did...
> >>
> >> p
> >>
> >>>  - Chuck
> >>>
> >>>
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