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Interceptors are implemented as Java classes, so each Interceptor has a class name. To make it easier to reference Interceptors, each class can be registered with the framework and given a unique, simpler name.
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<interceptors>
<interceptor name="security" class="com.company.security.SecurityInterceptor"/>
<interceptor-stack name="secureStack">
<interceptor-ref name="security"/>
<interceptor-ref name="defaultStack"/>
</interceptor-stack>
</interceptors>
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but any action may also define its own local stack.
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<action name="VelocityCounter" class="org.apache.struts2.example.counter.SimpleCounter">
<result name="success">...</result>
<interceptor-ref name="defaultComponentStack"/>
</action>
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