@Singleton
@Startup
public class FooEJB {

    @Schedule(hour = "*", minute = "*", second = "*/5", info ="foo timer",persistent=true)
    public void printDate() {
    System.out.println("It is " + new java.util.Date().toString());
    }
}

<datasource jta="true" jndi-name="java:/jdbc/fooDS" pool-name="pgre" enabled="true" use-ccm="true">
    <connection-url>jdbc:postgresql://db_host/foodb</connection-url>
    <transaction-isolation>TRANSACTION_SERIALIZABLE</transaction-isolation>
    <driver>postgresql</driver>
    <security>
        <user-name>foo</user-name>
        <password>pwd/password>
    </security>
    <validation>
        <validate-on-match>false</validate-on-match>
        <background-validation>false</background-validation>
    </validation>
    <timeout>
        <set-tx-query-timeout>false</set-tx-query-timeout>
        <blocking-timeout-millis>0</blocking-timeout-millis>
        <idle-timeout-minutes>0</idle-timeout-minutes>
        <query-timeout>0</query-timeout>
        <use-try-lock>0</use-try-lock>
        <allocation-retry>0</allocation-retry>
        <allocation-retry-wait-millis>0</allocation-retry-wait-millis>
    </timeout>
    <statement>
        <share-prepared-statements>false</share-prepared-statements>
    </statement>
</datasource>


<timer-service thread-pool-name="default" default-data-store="clustered-store">
        <data-stores>
            <database-data-store name="clustered-store" datasource-jndi-name="java:/jdbc/fooDS" database="postgresql" partition="timer" refresh-interval="10000"/>
        </data-stores>
    </timer-service>