Chapter 13. Host and Engine

Two topics of discussion in this chapter are hosts and engines. You use a host if you want to run more than one context in the same Tomcat deployment. In theory, you do not need a host if you only have one context, as stated in the description of the org.apache.catalina.Context interface:

The parent Container attached to a Context is generally a Host, but may be some other implementation, or may be omitted if it is not necessary.