Fixing Struts2 initialization error on Jetty restart
[ERROR] Error reconfiguring/restarting webapp after change in watched files
Caught exception while loading file struts-default.xml – [unknown location]
…
Caused by: java.lang.ClassCastException: org.apache.xerces.parsers.XIncludeAwareParserConfiguration cannot be cast to org.apache.xerces.xni.parser.XMLParserConfiguration
…
This issue seems to only occur with Java 6 and is related to the Xalan version included in this JDK.
Add xalan to your pom or in an endorsed/shared directory and the problem goes away.
<dependency>
<groupId>xalan</groupId>
<artifactId>xalan</artifactId>
<version>2.7.1</version>
</dependency>
More details there : JIRA item.
