There are some duplicated jars in the lib sub-package after installing the maven poms, because the artifactId in the pom file is different with the jar name in the build.xml, %mvn_artifact install the pom with the artifactId name, Here are the duplicated jars:
tomcat-annotations-api.jar
tomcat-catalina-ant.jar
tomcat-catalina-ha.jar
tomcat-catalina.jar
tomcat-jasper-el.jar
tomcat-jasper.jar
tomcat-jaspic-api.jar
tomcat-ssi.jar
tomcat-storeconfig.jar
tomcat-tribes.jar
tomcat-websocket-api.jar

Reproducible: Always