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

I found the solution for my problem with this exception, according to Javadoc and databasesandlife.com I have used two system properties and problem was gone, because our code was written to use JDK xerces

-Djavax.xml.parsers.DocumentBuilderFactory=com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl  -Djavax.xml.parsers.SAXParserFactory=com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl  

Am Freitag, 2. Dezember 2016 11:10:58 UTC+1 schrieb Peter Petranik:

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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