The error mentioned in Stack Trace is self-explanatory. You can see it clearly says the
It means that your validation.xml was not properly loaded by Container.
Always try to use (or copy) all xml and jar files from Struts-blank.war (version specific). It will help you a lot as you will no need to bother about the DOCTYPE in XML and jar files version.
Regards,
Fidel
God Gave Me Nothing I Wanted, He Gave Me Everything I Needed.
OCPJP6