Context ctx = new InitialContext();
DataSource ds = ( DataSource) ctx.lookup( Parameters.PGSQL_CONTEXT_UTR);
Connection conn = ds.getConnection();
Statement stmt = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.FETCH_REVERSE);

<datasource jta="true" jndi-name="java:jboss/PostgresDS" pool-name="postgresDS" enabled="true" use-java-context="true" use-ccm="true">
                    <connection-url>jdbc:postgresql://localhost:5432/my_db?charSet=UTF-8</connection-url>
                    <driver>org.postgresql</driver>
                    <transaction-isolation>TRANSACTION_READ_COMMITTED</transaction-isolation>
                    <pool>
                        <min-pool-size>10</min-pool-size>
                        <max-pool-size>1800</max-pool-size>
                        <prefill>false</prefill>
                    </pool>
                    <security>
                        <user-name>db_admin</user-name>
                        <password>pwd</password>
                    </security>
                    <statement>
			<track-statements>true</track-statements>
                        <prepared-statement-cache-size>16</prepared-statement-cache-size>
                    </statement>
		    <timeout>
			<idle-timeout-minutes>1</idle-timeout-minutes>
		    </timeout>
</datasource>
<drivers>
                    <driver name="org.postgresql" module="org.postgresql">
                        <driver-class>org.postgresql.Driver</driver-class>
                    </driver>
</drivers>