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

Try by removing/exluding (if you have it in you r dependencies) xerces. 

On Fri, 2 Dec 2016 at 07:10 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.

--
You received this message because you are subscribed to the Google Groups "GWT Users" group.
To unsubscribe from this group and stop receiving emails from it, send an email to google-web-toolkit+unsubscribe@googlegroups.com.
To post to this group, send email to google-web-toolkit@googlegroups.com.
Visit this group at https://groups.google.com/group/google-web-toolkit.
For more options, visit https://groups.google.com/d/optout.

--
You received this message because you are subscribed to the Google Groups "GWT Users" group.
To unsubscribe from this group and stop receiving emails from it, send an email to google-web-toolkit+unsubscribe@googlegroups.com.
To post to this group, send email to google-web-toolkit@googlegroups.com.
Visit this group at https://groups.google.com/group/google-web-toolkit.
For more options, visit https://groups.google.com/d/optout.