web.xml http://docs.oracle.com/cd/E14571_01/web.1111/e13712/web_xml.htm context-param description display-name distributable ejb-ref ejb-local-ref env-entry error-page filter filter-mapping icon jsp-config listener login-config mime-mapping resource-env-ref resource-ref security-constraint security-role servlet servlet-mapping session-config web-app welcome-file-list