Error log:
2008-7-4 11:09:50 org.apache.catalina.startup.HostConfig deployWAR
??: Deploying web application archive webchat.war
2008-7-4 11:09:51 org.apache.catalina.core.StandardContext start
??: Error filterStart
2008-7-4 11:09:51 org.apache.catalina.core.StandardContext start
??: Context /webchat startup failed due to previous errors