Listato 2. Sezione di server.xml dove sono contenuti gli elementi di tipo realm

<!--
  This Realm uses the UserDatabase configured in the global JNDI
      resources under the key "UserDatabase". Any edits
      that are performed against this UserDatabase are immediately
      available for use by the Realm.
  -->
  <Realm className="org.apache.catalina.realm.UserDatabaseRealm" resourceName="UserDatabase" />
<!--
  Comment out the old realm but leave here for now in case we
      need to go back quickly
  -->
<!--
      <Realm className="org.apache.catalina.realm.MemoryRealm" />

  -->
<!--
  Replace the above Realm with one of the following to get a Realm
      stored in a database and accessed via JDBC
  -->
<!--
      <Realm className="org.apache.catalina.realm.JDBCRealm"
              driverName="org.gjt.mm.mysql.Driver"
              connectionURL="jdbc:mysql://localhost/authority"
              connectionName="test" connectionPassword="test"
              userTable="users" userNameCol="user_name" userCredCol="user_pass"
          userRoleTable="user_roles" roleNameCol="role_name" />

  -->
<!--
      <Realm className="org.apache.catalina.realm.JDBCRealm"
              driverName="oracle.jdbc.driver.OracleDriver"
              connectionURL="jdbc:oracle:thin:@ntserver:1521:ORCL"
              connectionName="scott" connectionPassword="tiger"
              userTable="users" userNameCol="user_name" userCredCol="user_pass"
          userRoleTable="user_roles" roleNameCol="role_name" />

  -->
<!--
      <Realm className="org.apache.catalina.realm.JDBCRealm"
              driverName="sun.jdbc.odbc.JdbcOdbcDriver"
              connectionURL="jdbc:odbc:CATALINA"
              userTable="users" userNameCol="user_name" userCredCol="user_pass"
          userRoleTable="user_roles" roleNameCol="role_name" />

  -->