I am getting this as well. I never had Xerces in my project, but
attempted to add it to fix this problem to no avail. Is there any
resolution here?

On Aug 21, 12:59 pm, Sumit Chandel <sumitchan...@google.com> wrote:
> Hi Erik,
> Are you using XercesImpl classes in your actual application code? If not,
> try removing it from your project and hosted mode launch configuration
> classpath and see if the error still occurs. You mentioned that you tried
> adding it, which suggests that it wasn't present the first time it occurred.
> In such a case, this may be an issue with GWT in that XercesImpl classes are
> bundled and property files that Xerces depends on may have different values,
> or it could also be an issue with the Apache module you're using if it uses
> Xerces and also defines different property files.
>
> In any case, please let me know the scenarios under which you reproduced
> this issue to follow-up from there.
>
> Cheers,
> -Sumit Chandel
>
>
>
> On Tue, Aug 18, 2009 at 5:12 AM, erikhedb <erik.hedb...@tarinfo.com> wrote:
>
> > Hello,
>
> > I am trying to migrate from GWT 1.5 on Mac to 1.7 and keep running
> > into this error when stating hosted mode. I also switched to 1.6 and
> > the same error occurs there. I did try to add xercesImpl.jar but the
> > problem is still there.
>
> > Any clues to what is going on?
>
> > Thanx
> > /Erik Hedblom
>
> > [WARN] Error deploying web application directory ROOT
> > javax.xml.parsers.FactoryConfigurationError: Provider
> > org.apache.xerces.jaxp.DocumentBuilderFactoryImpl not found
> >        at javax.xml.parsers.DocumentBuilderFactory.newInstance
> > (DocumentBuilderFactory.java:104)
> >        at org.apache.commons.modeler.util.DomUtil.readXml(DomUtil.java:284)
> >        at
> > org.apache.commons.modeler.modules.MbeansDescriptorsDOMSource.execute
> > (MbeansDescriptorsDOMSource.java:130)
> >        at
>
> > org.apache.commons.modeler.modules.MbeansDescriptorsDOMSource.loadDescripto 
> > rs
> > (MbeansDescriptorsDOMSource.java:120)
> >        at org.apache.commons.modeler.Registry.load(Registry.java:819)
> >        at
> > org.apache.commons.modeler.Registry.loadDescriptors(Registry.java:
> > 931)
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