@Component
@Transactional
public class FmTrfUtil {
    static int returnVal;

    @PersistenceContext
    private EntityManager em;
    public int insertFmTrfs(List<String> trfs, String source) {
        Session session = em.unwrap( Session.class );
        final String[] trfArray = trfs.toArray(new String[trfs.size()]);
        final String src = source;
        session.doWork( new Work(){
            public void execute(Connection conn) throws SQLException {
                CallableStatement stmt = null;
                OracleConnection oraCon = conn.unwrap(OracleConnection.class);
                Array array = oraCon.createARRAY("VARCHAR2_TAB_T", trfArray);
                stmt = conn.prepareCall("{? = call FM_TRF_UTIL.process_fm_trf(?,?)}");
                stmt.registerOutParameter(1, Types.INTEGER);
                stmt.setArray(2, array);
                stmt.setString(3, src);
                stmt.execute();
                returnVal = stmt.getInt(1);
            }
        });
        return returnVal;
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<Context crossContext="true">
    <WatchedResource>WEB-INF/web.xml</WatchedResource>
    <Resource auth="Container" driverClassName="oracle.jdbc.OracleDriver" maxActive="10" maxIdle="10" maxWait="-1"
              name="jdbc/ristoredb" password="ristoreowner987" type="javax.sql.DataSource" username="ristore_owner"
              url="jdbc:oracle:thin:@ldap://mdaoid.xxx.org:389/risdev3,cn=OracleContext,dc=ac,,dc=org"
            />
</Context>