ok seems like copying LocalStrings.properties from a tomcat50-service.jar file in jbossweb-tomcat50.sar and adding it to my .war eliminated "resource not found". note, that i had to create a org.jboss.web.tomcat.session package in my war and place LocalStrings there. Please note that package name in tomcat50-service.jar file was:
org.jboss.web.tomcat.t5.session, whereas the error message stated WebCtxLoader was looking for:
Is this a bug? Is WebCtxLoader looking for the wrong package?
BUT, my session id strings still look garbled:
Session id: TtqqbaYACnRLlEjufUS8-A**.node1