core/src/test/resources/com/opensymphony/xwork2/config/providers/xwork-test-interceptor-defaultref.xml

<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
        "https://struts.apache.org/dtds/struts-2.5.dtd">
<struts>
    <!-- this package has a default interceptor ref - so actions with no refs should have the default ref -->
    <package name="default">
        <interceptors>
            <interceptor name="noop" class="org.apache.struts2.interceptor.NoOpInterceptor"/>
            <interceptor name="logging" class="com.opensymphony.xwork2.interceptor.LoggingInterceptor"/>
        </interceptors>

        <default-interceptor-ref name="noop" />
        <action name="ActionWithOwnRef" class="com.opensymphony.xwork2.SimpleAction">
            <interceptor-ref name="logging"/>
        </action>
        <action name="ActionWithDefaultRef" class="com.opensymphony.xwork2.SimpleAction" />
    </package>

    <!-- this package has no default interceptor ref - so actions with no refs should inherit the default interceptor -->
    <!-- this tests that default interceptor refs are inherited -->
    <package name="subpackage" extends="default">
        <action name="ActionWithNoRef" class="com.opensymphony.xwork2.SimpleAction" />

        <action name="AnotherActionWithOwnRef" class="com.opensymphony.xwork2.SimpleAction">
            <interceptor-ref name="logging"/>
        </action>
    </package>
</struts>