generator-liferay-portlet-template/generators/app/templates/WEB-INF/jboss-deployment-structure.xml

Generated liferay portlet is a yeoman generator. This generator make a portlet with a specific configuration.

<?xml version="1.0"?>
<jboss-deployment-structure xmlns="urn:jboss:deployment-structure:1.0">
	<deployment>
		<dependencies>
			<module name="org.apache.log4j"/>
			<module name="com.liferay.portal" />
			<module name="com.liferay.util" />
		</dependencies>
	</deployment>
</jboss-deployment-structure>