Struts.xml file

<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>
    <package name="default" extends="struts-default">
        <action name="numberCheck" class="NumberCheckAction">
            <result name="success">/success.jsp</result>
            <result name="failure">/failure.jsp</result>
        </action>
    </package>
</struts>

Actions in struts are grouped into packages. Struts.xml file contains more than one package.

<package name="default" extends="struts-default">

A package must extends the struts-default package that defined in struts-default.xml. struts-default.xml configured with various features like interceptors (to instantiate action object by using request parameters, result types etc.,). So by extending struts-default.xml, we are inheriting the features of struts-default.xml into current package.

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