java.sql.SQLException: Closed Resultset: next

[vaishnaviparthasarathy5]

I have a webapp I am migrating from weblogic to tomcat.I have the app deployed on the Tomcat, after adding the EclipseLink jars.

The JPA entities and the Database queries that get the result set work perfectly fine.
But I have few queries that invoke Oracle DB functions which return REF CURSORS. I am running into the below exception in such cases.

java.sql.SQLException: Closed Resultset: next
at oracle.jdbc.driver.InsensitiveScrollableResultSet.ensureOpen(InsensitiveScrollableResultSet.java:112)
at oracle.jdbc.driver.InsensitiveScrollableResultSet.next(InsensitiveScrollableResultSet.java:400)

Code snippet that is failing.

Query query = em.createNativeQuery("SELECT rse_parameter_calc.get_run_type_overview() from dual");
rs_lst =query.getResultList();
rs = rs_lst.get(0);
}
while (rs.next()) --> The code fails here.

The same code works perfectly fine weblogic.
I am using the same ojdb8 drivers in both the servers .Any pointers would be helpful
Tried with both the versions: EclipseLink 2.6 , EclipseLink 2.7.13