Yes, there are two complementary approaches. We can include other
struts.xml-format files from a bootstrap
struts.xml file, or we can package a
struts.xml files in a JAR. Or both.
<include> element documentation.
You can use
<include> elements in your
struts.xml interchangeably with
<package> elements. The configuration objects will be loaded in the order of appearance. The framework reads the configuration from top to bottom and adds objects as they are referenced.
A "module" can be added to an application by placing a
struts.xml and related classes into a JAR on the classpath. FreeMarker and Velocity templates can also be provided by JAR, making it possible to distribution a module in a single, self-contained JAR that is automatically configured on startup.