How does WTP support separate Tomcat server instances?
Apache Tomcat 4.0 and later operate with paths that are relative to one of two locations. These two locations are known in the Tomcat batch scripts as CATALINA_HOME and CATALINA_BASE. In the Java command that actually runs Tomcat, they appear as catalina.home and catalina.base system properties. The “home” location defines where the binary portion of Tomcat lives. This includes the bin, common, and server directories. The “base” location defines where the configuration and working directories for a Tomcat server instance lives. This includes the conf, logs, shared, webapps, and work directories. Tomcat servers created in WTP will have their “home” location set to the Tomcat installation associated with the Tomcat Runtime selected for the server. The “base” location will default to an internally created directory under the .metadata folder found in your workspace.