Xincludeawareparserconfiguration cannot be cast to Org.apache.xerces.xni.parser.XMLParserConfigurat

Single context, configuration no problem
But when a Tomcat has two context (all with richfaces), it doesn't start up, error
Com.sun.faces.config.ConfigurationException:CONFIGURATION failed! Org.apache.xerces.parsers.XIncludeAwareParserConfiguration cannot be cast to Org.apache.xerces.xni.parser.XMLParserConfiguration
At Com.sun.faces.config.ConfigManager.initialize (configmanager.java:213)
At Com.sun.faces.config.ConfigureListener.contextInitialized (configurelistener.java:196)
At Org.apache.catalina.core.StandardContext.listenerStart (standardcontext.java:3843)
At Org.apache.catalina.core.StandardContext.start (standardcontext.java:4342)
At Org.apache.catalina.core.ContainerBase.addChildInternal (containerbase.java:791)
At Org.apache.catalina.core.ContainerBase.addChild (containerbase.java:771)
At Org.apache.catalina.core.StandardHost.addChild (standardhost.java:525)
At Org.apache.catalina.startup.HostConfig.deployDirectory (hostconfig.java:926)
At Org.apache.catalina.startup.HostConfig.deployDirectories (hostconfig.java:889)
At Org.apache.catalina.startup.HostConfig.deployApps (hostconfig.java:492)
At Org.apache.catalina.startup.HostConfig.start (hostconfig.java:1149)
At Org.apache.catalina.startup.HostConfig.lifecycleEvent (hostconfig.java:311)
At Org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent (lifecyclesupport.java:117)
At Org.apache.catalina.core.ContainerBase.start (containerbase.java:1053)
At Org.apache.catalina.core.StandardHost.start (standardhost.java:719)
At Org.apache.catalina.core.ContainerBase.start (containerbase.java:1045)
At Org.apache.catalina.core.StandardEngine.start (standardengine.java:443)
At Org.apache.catalina.core.StandardService.start (standardservice.java:516)
At Org.apache.catalina.core.StandardServer.start (standardserver.java:710)
At Org.apache.catalina.startup.Catalina.start (catalina.java:578)
At Sun.reflect.NativeMethodAccessorImpl.invoke0 (Native method)
At Sun.reflect.NativeMethodAccessorImpl.invoke (nativemethodaccessorimpl.java:39)
At Sun.reflect.DelegatingMethodAccessorImpl.invoke (delegatingmethodaccessorimpl.java:25)
At Java.lang.reflect.Method.invoke (method.java:597)
At Org.apache.catalina.startup.Bootstrap.start (bootstrap.java:288)
At Org.apache.catalina.startup.Bootstrap.main (bootstrap.java:413)
Caused By:java.lang.ClassCastException:org.apache.xerces.parsers.XIncludeAwareParserConfiguration cannot is cast to Org.apache.xerces.xni.parser.XMLParserConfiguration


Then the Xercesimpl.jar file in a Lib is deleted, and 2 can start up.
It's strange ... Somehow
But while it's starting up, some programs that use Ajax can go wrong.

Java.lang.noclassdeffounderror:org/apache/xerces/xni/parser/xmlconfigurationexception
Org.ajax4jsf.webapp.configurablexmlfilter$nekoparserconfig.createparser (configurablexmlfilter.java:162)
Org.ajax4jsf.webapp.ParserConfig.getParser (parserconfig.java:49)
Org.ajax4jsf.webapp.ConfigurableXMLFilter.getParser (configurablexmlfilter.java:130)

Commiseration Ah ...

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Come up with a way: Move Xercesimpl.jar to the Tomcat/lib directory
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Reproduced

Delete the Xercesimpl.jar from the two items and put them under Tomcat/lib