In Eclipse you can configure numerous servers to run inside the IDE, including Tomcat. Depending on your Tomcat configuration, at some point in the life cycle of a webapp your J
Go to "Servers" window -> double click on your tomcat instance -> clik "Open launch configuration" -> go to "Arguments" tab.
Look for variable definition like this:
-Dcatalina.base="/Users/dirtyaffairs/Documents/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0"