Re: [hibernate-dev] Immutable entities
Hi,
It seems changing an immutable entity does not throw an exception. Instead
the update statements just gets ignored. However additions/removals to an
immutable collection throws a HibernateException. Is this correct?
I also changed my test code to do something like this:
public void testImmutableEntity() throws Exception {
Session s = openSession();
Transaction tx = s.beginTransaction();
Country country = new Country();
country.setName("Germany");
s.persist(country);
tx.commit();
s.close();
// try changing the entity
s = openSession();
tx = s.beginTransaction();
Country germany = (Country) s.get(Country.class, country.getId());
assertNotNull(germany);
germany.setName("France");
assertEquals("Local name can be changed", "France",
germany.getName());
s.save(germany);
tx.commit();
s.close();
// retrieving the country again - it should be unmodified
s = openSession();
tx = s.beginTransaction();
germany = (Country) s.get(Country.class, country.getId());
assertNotNull(germany);
assertEquals("Name should not have changed", "Germany",
germany.getName());
s.close();
// // try deletion
// s = openSession();
// tx = s.beginTransaction();
// s.delete(germany);
// tx.commit();
// s.close();
//
// s = openSession();
// tx = s.beginTransaction();
// germany = (Country) s.get(Country.class, country.getId());
// assertNotNull(germany);
// assertEquals("Name should not have changed", "Germany",
germany.getName());
// s.close();
}
Changes to the entity seem to be properly ignored, but if I comment out
the attempt to delete an entity the test fails. Personally I think it
should be possible to delete the entity, however the documentation says:
"may not be updated or deleted by the application".
So my questions really are:
1. Is it correct that an immutable entity behaves differently than an
immutable collection? For the former update statements just get ignored,
for the latter a HibernateException is thrown.
2. Is the documetnation of immutable wrong - an immutable entity can be
deleted?
--Hardy