What object type does Spring Hibernate Template execute method return for a counting query on Oracle?
Turns out that the ClassCastException may be due to a bug in the Hibernate standard query cache.
Solution is to add a scalar to the query:
String sql = "select count(*) as result from table";BigDecimal count = (BigDecimal) ht.execute(new HibernateCallback() { public Object doInHibernate(Session session) throws HibernateException { SQLQuery query = session.createSQLQuery(sql); // Add scalar to avoid bug in Hibernate query cache. query.addScalar("result", Hibernate.BIG_DECIMAL); return query.uniqueResult(); }});References:
- ClassCastException with SQLQuery and setCacheable(true)
- Martin Schaaf's Blog: ClassCastException with SQLQuery and setCacheable(true)
- Caching a raw sql count with Hibernate and EhCache
- HHH-5163 Bug when applying a ResultTransformer on a cacheable projection based criteria
- ClassCastException when Hibernate tries to cache results using ResultTransformer