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

Thx guys for quick response, but my problem was only in some Eclipse related file. I am using Eclipse SDK 4.6.1 with GWT Eclipse Plugin. After I have switched from GWT 2.7 to GWT 2.8 I missed in $PROJECT_DIR/.settings / com.gwtplugins.gwt.eclipse.core.prefs the additional line 

filesCopiedToWebInfLib=gwt-servlet.jar 

.. this should be added by GWT Eclipse Plugin, I have just removed it by mistake. With this line everything works without any problem in EclipseIDE.
For production build, we use mojo gwt-maven-plugin and there we also do not have a problem.

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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