You need to build war file with:
ant war
However, you may get:
java.lang.ClassNotFoundException: org.apache.tools.ant.taskdefs.optional.TraXLiaison
Your ant may not be installed right. Just download binaries (not use yum) from ant.apache.org set classpath to the jars within, e.g.
export CLASSPATH=/opt/ant/apache-ant-1.8.2/lib/ant-antlr.jar:/opt/ant/apache-ant-1.8.2/li b/ant-apache-bcel.jar:/opt/ant/apache-ant-1.8.2/lib/ant-apache-bsf.jar:/opt/ant/apache-an t-1.8.2/lib/ant-apache-log4j.jar:/opt/ant/apache-ant-1.8.2/lib/ant-apache-oro.jar:/opt/an t/apache-ant-1.8.2/lib/ant-apache-regexp.jar:/opt/ant/apache-ant-1.8.2/lib/ant-apache-res olver.jar:/opt/ant/apache-ant-1.8.2/lib/ant-apache-xalan2.jar:/opt/ant/apache-ant-1.8.2/l ib/ant-commons-logging.jar:/opt/ant/apache-ant-1.8.2/lib/ant-commons-net.jar:/opt/ant/apa che-ant-1.8.2/lib/ant-jai.jar:/opt/ant/apache-ant-1.8.2/lib/ant-javamail.jar:/opt/ant/apa che-ant-1.8.2/lib/ant-jdepend.jar:/opt/ant/apache-ant-1.8.2/lib/ant-jmf.jar:/opt/ant/apac he-ant-1.8.2/lib/ant-jsch.jar:/opt/ant/apache-ant-1.8.2/lib/ant-junit4.jar:/opt/ant/apach e-ant-1.8.2/lib/ant-junit.jar:/opt/ant/apache-ant-1.8.2/lib/ant-launcher.jar:/opt/ant/apa che-ant-1.8.2/lib/ant-netrexx.jar:/opt/ant/apache-ant-1.8.2/lib/ant-swing.jar:/opt/ant/ap ache-ant-1.8.2/lib/ant-testutil.jar:$CLASSPATH AND make sure ANT_HOME is set, i.e.: export ANT_HOME=/opt/ant/apache-ant-1.8.2