Try recompiling your valve and you will see the Valve contract has changed. You need a new version of your valve for tc5.5.
Thanks Scott...I've been searching the javadocs and others for a deprecated list between tc5.0 and tc5.5...
Example is org.apache.catalina.HttpRequest was in 5.0 but is no longer in 5.5 (at least not in catalina.jar)...I would think release notes, etc. would mention these changes...any clues...
Thanks again for the quick response.