Hi,
after setting jaxp debug to true, 
I see the following error:

JAXP: using thread context class loader (ModuleClassLoader for Module "deployment.keycloak-server.war:main" from Service Module Loader) for search
11:03:40,517 ERROR [stderr] (default task-2) JAXP: Looking up system property 'javax.xml.xpath.XPathFactory:http://java.sun.com/jaxp/xpath/dom'
11:03:40,517 ERROR [stderr] (default task-2) JAXP: The value is '__redirected.__XPathFactory'
11:03:40,517 ERROR [stderr] (default task-2) JAXP: createInstance(__redirected.__XPathFactory)
11:03:40,518 ERROR [stderr] (default task-2) JAXP: loaded __redirected.__XPathFactory from jar:file:/Users/Carmen/software/keycloak-demo-1.5.0.Final/keycloak/jboss-modules.jar!/__redirected/__XPathFactory.class
11:03:40,518 ERROR [stderr] (default task-2) JAXP: could not instantiate __redirected.__XPathFactory
11:03:40,519 ERROR [stderr] (default task-2) java.lang.ClassCastException: __redirected.__XPathFactory cannot be cast to javax.xml.xpath.XPathFactory
11:03:40,519 ERROR [stderr] (default task-2) at javax.xml.xpath.XPathFactoryFinder.createInstance(XPathFactoryFinder.java:306)
11:03:40,519 ERROR [stderr] (default task-2) at javax.xml.xpath.XPathFactoryFinder._newFactory(XPathFactoryFinder.java:184)
11:03:40,519 ERROR [stderr] (default task-2) at javax.xml.xpath.XPathFactoryFinder.newFactory(XPathFactoryFinder.java:157)


The dependencies in module.xml for my federation provider is as follows:

    <dependencies>
        <module name="org.keycloak.keycloak-core"/>
        <module name="org.keycloak.keycloak-model-api"/>
        <module name="javax.api"/>
    </dependencies>

Thanks again,

Maria


On Oct 14, 2015, at 9:42 AM, carmen <carmen.checa@masergy.com> wrote:

Hi all,

I am writing a federation provider that accesses Oracle using MyBatis.
I get the following error when MyBatis is trying to read its xml configuration:


### Cause: java.lang.RuntimeException: XPathFactory#newInstance() failed to create an XPathFactory for the default object model: http://java.sun.com/jaxp/xpath/dom with the XPathFactoryConfigurationException: javax.xml.xpath.XPathFactoryConfigurationException: No XPathFactory implementation found for the object model: http://java.sun.com/jaxp/xpath/dom
at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:26)
at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:54)


The federation provider jar is a big fat jar that includes all its dependencies.

Any ideas?

Thank you
Maria