tomcat/conf/tomcat-users.xml

<!--
  NOTE:  By default, no user is included in the "manager" role required
  to operate the "/manager" web application.  If you wish to use this app,
  you must define such a user - the username and password are arbitrary.
-->
<tomcat-users>
  <user name="tomcat" password="tomcat" roles="tomcat" />
  <user username="j2deployer" password="j2deployer" roles="admin,manager,tomcat"/>
</tomcat-users>