Re: GWT2.8 : org.apache.xerces.parsers.XIncludeAwareParserConfiguration cannot be cast to org.apache.xerces.xni.parser.XMLParserConfiguration

In the end we fixed that by shipping our own version of xerces & co in our war.

On 2 December 2016 at 09:36, Peter Petranik <petranikpeter@gmail.com> wrote:
> Hi, I have a same problem after I updated my application from GWT 2.7 to 2.8
>
> That is the code that raises the exception:
> DocumentBuilderFactory.newInstance().newDocumentBuilder()
>
> And that is the exception:
> java.lang.ClassCastException:
> org.apache.xerces.parsers.XIncludeAwareParserConfiguration cannot be cast to
> org.apache.xerces.xni.parser.XMLParserConfiguration
> at org.apache.xerces.parsers.DOMParser.<init>(Unknown Source)
> at org.apache.xerces.parsers.DOMParser.<init>(Unknown Source)
> at org.apache.xerces.jaxp.DocumentBuilderImpl.<init>(Unknown Source)
> at
> org.apache.xerces.jaxp.DocumentBuilderFactoryImpl.newDocumentBuilder(Unknown
> Source)
> ...
>
> Has somebody already found some solution how to fix that ?
>
> Am Donnerstag, 6. Oktober 2016 09:20:49 UTC+2 schrieb Darren Smith:
>>
>> Hi,
>>
>> I am developing a <web-app> that contains within it
>> - a vanilla HttpServlet
>> - a GWT RPC Service implementation (RemoteServiceServlet)
>>
>> I am currently using [GWT2.8rc1].
>>
>> Both servlets manipulate XML documents, and hence make calls to the
>> following code
>> DocumentBuilderFactory docfactory = DocumentBuilderFactory.newInstance();
>> docfactory.setNamespaceAware(true);
>>
>> DocumentBuilder builder = docfactory.newDocumentBuilder(); // * problem
>> here *
>>
>> When I launch the application in Eclipse, using the embedded Jetty
>> container, the vanilla HttpServlet will fail at the line
>> DocumentBuilder builder = docfactory.newDocumentBuilder(); // * problem
>> here *
>>
>> The error message is
>> java.lang.ClassCastException:
>> org.apache.xerces.parsers.XIncludeAwareParserConfiguration cannot be cast to
>> org.apache.xerces.xni.parser.XMLParserConfiguration
>>
>> Having done some research, this exception is typically raised when there
>> are several Xerces implementations found on the classpath.
>> (I can only see Xerces implementations in gwt-dev and in Eclipse as a
>> plugin).
>>
>>
>> For the GWT RPC Service implementation, launched as part of the same
>> <web-app>, the XML document processing works fine - i.e. no exception
>> raised.
>>
>> If I comment out in the web.xml file the GWT-RPC servlet defintion, then
>> the vanilla HttpServlet will perform the XML document processing without an
>> exception.
>>
>>
>> Has anyone encountered similar problems?
>>
>> Darren Smith.
>>
>>
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Ian Whyman

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