portlet/src/main/resources/struts-edit.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
	"-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
	"https://struts.apache.org/dtds/struts-2.5.dtd">

<struts>
	<package name="edit" extends="struts-portlet-default"
		namespace="/edit">
		<action name="index"
			class="com.opensymphony.xwork2.ActionSupport">
			<result name="success">/WEB-INF/edit/index.jsp</result>
		</action>
		<action name="test"
			class="com.opensymphony.xwork2.ActionSupport">
			<result name="success">/WEB-INF/edit/test.jsp</result>
		</action>
		<action name="formExampleEdit"
			class="org.apache.struts2.portlet.example.FormExample" method="input">
			<result name="input">
				/WEB-INF/edit/formExampleInput.jsp
			</result>
		</action>

		<action name="processFormExampleEdit"
			class="org.apache.struts2.portlet.example.FormExample">
			<result name="input">
				/WEB-INF/edit/formExampleInput.jsp
			</result>
			<result name="success">
				/edit/processFormExampleForward.action?firstName=${firstName}&amp;lastName=${lastName}
			</result>
		</action>

		<action name="processFormExampleForward"
			class="org.apache.struts2.portlet.example.FormExample">
			<result name="success">
				/WEB-INF/edit/formExample.jsp
			</result>
		</action>
	</package>

	<package name="editTest" extends="edit" namespace="/edit/dummy/test">
		<action name="testAction"
			class="com.opensymphony.xwork2.ActionSupport">
			<result name="success">/WEB-INF/edit/namespaceTest.jsp</result>
		</action>
	</package>
</struts>