validationQueryTimeout is missing from EWS 1.0.2's version of Tomcat, 6.0.32. However, it does exist in the community version 6.0.32. I have a customer that is wanting to use this property, or needs a substitute for some reason.
Commons-dbcp rev 1.4 defines PROP_VALIDATIONQUERY_TIMEOUT. The ews/tomcat builds use commons-dbcp 1.2 wherein the property is not defined. Even if it were true that ews/tomcat builds produced tomcat-dbcp, we are not, at this time, able to use commons-dbcp 1.4 to produce it.