[hibernate-dev] immutable can be deleted? and should readonly cache throw exception?
Hi There,
is an immutable entity can be deleted?
according to http://docs.jboss.org/hibernate/core/4.0/manual/en-US/html_single/
"12.1.1. Entities of immutable classes"
"An entity of an immutable class can created and deleted the same as an entity of a
mutable class."
but "5.1.1 Entity" saying:
"Some entities are not mutable. They cannot be updated or deleted by the application.
This allows Hibernate to make some minor performance optimizations.. Use the @Immutable
annotation."
the reason i'm asking this is this test
org.hibernate.test.annotations.entity.BasicHibernateAnnotationsTest#testPolymorphism.
when running testsuite on jdk 7, the order of methods returned by getDeclaredMethods
changed and can vary from run to run
(http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7023180), so, the order of each test
case in a test class can't be guaranteed.
so, we need each test case independent.
clearly, this test case depends on the order.
I added a cleanupTest method
@Override
protected void cleanupTest() throws Exception {
Session s = openSession();
s.beginTransaction();
List list = s.createQuery( "from java.lang.Object" ).list();
for(Object obj : list){
s.delete( obj );
}
s.getTransaction().commit();
s.close();
}
and get this exception:
java.lang.UnsupportedOperationException: Can't write to a readonly object
at
org.hibernate.testing.cache.ReadOnlyEntityRegionAccessStrategy.lockItem(ReadOnlyEntityRegionAccessStrategy.java:68)
at org.hibernate.action.internal.EntityDeleteAction.execute(EntityDeleteAction.java:84)
at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:362)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:354)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:280)
at
org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:326)
at
org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:52)
at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1127)
at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:325)
at
org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.beforeTransactionCommit(JdbcTransaction.java:101)
at
org.hibernate.engine.transaction.spi.AbstractTransactionImpl.commit(AbstractTransactionImpl.java:175)
at
org.hibernate.test.annotations.entity.BasicHibernateAnnotationsTest.cleanupTest(BasicHibernateAnnotationsTest.java:105)
btw, i'm also seeing this jira https://hibernate.onjira.com/browse/HHH-6329
change the cleanupTest to use hql (s.createQuery("delete
java.lang.Object").executeUpdate();) runs successfully and no test failure.
-------------------------
Best Regards,u
Strong Liu <stliu at hibernate.org>
http://about.me/stliu/bio