Hi there
I really don't understand what's going on, or what to do.
identity seems to be the only valid generator, and It seems it gives back a Serializable object.
When I use type="serializable" I can't create the table because it tries to create a tinyblog with auto_increment.
any ideas ?
Thank you !

Hibernate version:3.2.0.ga

Mapping documents:
@OneToMany(cascade = CascadeType.ALL)
@CollectionId(columns = @Column(name="id"),type=@Type(type="long"),generator = "identity")



Code between sessionFactory.openSession() and session.close():

Full stack trace of any exception that occurs:
java.lang.ClassCastException: org.hibernate.id.IdentifierGeneratorFactory$2 cannot be cast to java.lang.Long
at org.hibernate.type.LongType.set(LongType.java:42)
at org.hibernate.type.NullableType.nullSafeSet(NullableType.java:83)
at org.hibernate.type.NullableType.nullSafeSet(NullableType.java:65)
at org.hibernate.persister.collection.AbstractCollectionPersister.writeIdentifier(AbstractCollectionPersister.java:807)
at org.hibernate.persister.collection.AbstractCollectionPersister.insertRows(AbstractCollectionPersister.java:1359)
at org.hibernate.action.CollectionUpdateAction.execute(CollectionUpdateAction.java:56)
at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:248)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:232)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:142)
at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:298)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.hibernate.context.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:301)
at $Proxy14.flush(Unknown Source)
at com.newco.leadmachine.action.AddWebSite.execute(AddWebSite.java:52)
at org.apache.struts.chain.commands.servlet.ExecuteAction.execute(ExecuteAction.java:58)
at org.apache.struts.chain.commands.AbstractExecuteAction.execute(AbstractExecuteAction.java:67)
at org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51)
at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
at org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:304)
at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
at org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)


Name and version of the database you are using:Mysql 5

I have found something that seems to work, though I still don't understand what was the previous problem ...

you have to use a GenericGenerator something like :

@GenericGenerator(name = "gg1",strategy = "increment")
@CollectionId(columns = @Column(name="id"),type=@Type(type="long"),generator = "gg1")

Hope it will help someone else !

Cheers.

Using increment is wroking fine, But i want to know why it's not working with native or sequence. For my Mysql database
i want to use native. don't want incriment and my mapping code is

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.ssis.model.Item2" table="item2">
<id name="itemId">
<generator class="native"></generator>
</id>
<idbag name="images" table="timage2">
<collection-id type="long" column="imageid" >
<generator class="native"></generator>
</collection-id>
<key column="itemId"></key>
<element type="string" column="filename"></element>
</idbag>
<property name="name"></property>
<property name="price"></property>
</class>
</hibernate-mappinv>

Can any one please answer . why I'm getting

Hibernate: insert into item2 (name, price) values (?, ?)
Hibernate: insert into timage2 (itemId, imageid, filename) values (?, ?, ?)
Exception in thread "main" java.lang.ClassCastException: org.hibernate.id.IdentifierGeneratorFactory$2 cannot be cast to java.lang.Long
at org.hibernate.type.LongType.set(LongType.java:65)
at org.hibernate.type.NullableType.nullSafeSet(NullableType.java:154)
at org.hibernate.type.NullableType.nullSafeSet(NullableType.java:136)
at org.hibernate.persister.collection.AbstractCollectionPersister.writeIdentifier(AbstractCollectionPersister.java:829)
at org.hibernate.persister.collection.AbstractCollectionPersister.recreate(AbstractCollectionPersister.java:1160)
at org.hibernate.action.CollectionRecreateAction.execute(CollectionRecreateAction.java:58)
at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:279)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:263)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:171)
at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1028)
at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:366)
at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:137)
at ItemTest.main(ItemTest.java:24)