select value$ from props$ where name = 'global_db_name'

<Context antiResourceLocking="true" crossContext="true" path="/taquillas">
    <Resource auth="Container" driverClassName="oracle.jdbc.OracleDriver"
              factory="org.apache.tomcat.jdbc.pool.DataSourceFactory"
              jdbcInterceptors="org.apache.tomcat.jdbc.pool.interceptor.ConnectionState;org.apache.tomcat.jdbc.pool.interceptor.StatementFinalizer"
              jmxEnabled="true" url="jdbc:oracle:thin:@yyy.yyy.yyy.yyy:zzzz:ANNI"
              username="xxxxxxxxx" name="jdbc/andrea" password="xxxxxxx"
              type="javax.sql.DataSource" validationInterval="30000"
              maxActive="50" minIdle="1" maxWait="10000" defaultAutoCommit="false"
              initialSize="1" removeAbandonedTimeout="60"
              removeAbandoned="true" validationQuery="SELECT 1 FROM DUAL"/>
</Context>

public dbutilsHandler()
            throws ClassNotFoundException, SQLException, NamingException {
        this.gson = new GsonBuilder()
                .setDateFormat("yyyy-MM-dd")
                .serializeNulls().create();
        InitialContext cxt;
        cxt = new InitialContext();
        this.ds = (DataSource) cxt.lookup("java:/comp/env/jdbc/andrea");
        this.query = new QueryRunner(ds);
        this.con = this.query.getDataSource().getConnection();
    }