WHAT IS A TOMCAT VALVE?

WHAT IS A TOMCAT VALVE?

A Tomcat valve - a new technology introduced with Tomcat 4 which allows you to associate an instance of a Java class with a particular Catalina container.

This configuration allows the named class to act as a preprocessor of each request. These classes are called valves, and they must implement the org.apache.catalina.Valve interface or extend the org.apache.catalina.valves.ValveBase class. Valves are proprietary to Tomcat and cannot, at this time, be used in a different servlet/JSP container. At this writing, Tomcat comes configured with four valves:

• Access Log
• Remote Address Filter
• Remote Host Filter
• Request Dumper

Each of these valves (and their available attributes) are described as follows.