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Set the "actionPackages" filter init param to a comma-separated list of packages containing Action classes in web.xml. The packages and their subpackages will be scanned. All classes in the designated packages that implement Action or end in "Action" are examined. The latter is to allow for POJO Actions that don't implement the Action interface.

<filter>
  <filter-name>struts2</filter-name>
  <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
  <init-param>
    <param-name>actionPackages</param-name>
    <param-value>com.foo.bar,com.baz.quux</param-value>
  </init-param>
</filter>

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