create or replace PROCEDURE MY_STORED_PROC(customerName IN VARCHAR2, customerAge IN number)
  AS
  BEGIN
--Some code that does not return anything here
END MY_STORED_PROC;

Session session = entityManager.getEntityManagerFactory().createEntityManager().unwrap(Session.class);
    StoredProcedureQuery myProc= session.createStoredProcedureQuery(
        QueryConstants.MY_STORED_PROC);
    myProc.registerStoredProcedureParameter("customerName", String.class, ParameterMode.IN);
    myProc.registerStoredProcedureParameter("customerAge", Integer.class, ParameterMode.IN);
    myProc.setParameter("customerName", "Terwilliger");
    myProc.setParameter("customerAge", 23);
    myProc.execute();

javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: Error calling CallableStatement.getMoreResults

Caused by: org.hibernate.exception.GenericJDBCException: Error calling CallableStatement.getMoreResults

Caused by: java.sql.SQLException: The number of parameter names does not match the number of registered praremeters