The Adapter

• For Apache to communicate with Tomcat, and forward requests as necessary, it needs some extra software—an “adapter”.

• An adapter will be implemented as an Apache module.

  • An Apache module is a piece of code that can be optionally linked in to (or left out of) the main server code.
  • Non-standard, plug-in, modules will typically be shared-object libraries (DLLs under Windows).
  • These live in a directory called /usr/local/apache/libexec.

• Apache modules generally have names of the form mod_XXXX

  • For example, mod_perl.

• There are two Tomcat adapter modules in common use: mod_jserv and mod_jk.

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