idBag Generator Class Cast Exception - mysql

Question

I've been trying to get an idbag working in hibernate. I been trying it against a MySql DB and a HSQLDB and I have also tried a couple different versions of Hibernate. Hibernate 4 and Hibernate 3 are giving slightly different information as to the cause of the error but both say the same thing in the main: Class Cast Exception.
I hosted all my code on bitbucket in a public repo and everything is there to include the DDL for creating a MySql or HSQL DB with the relevant tables. My HSQLDB version is 2.2.9 and the MySql version is 5.1.66 - My preference is to get it working on MySql.
Git Clone Command:
git clone https://pphi#bitbucket.org/pphi/idbag.git
Web Page:
https://pphi#bitbucket.org/pphi/idbag.git
When using Hibernate 4.0.1 I get this stack trace:
Hibernate: insert into idBagTest.Team (nickname, mascot) values (?, ?)
Hibernate: insert into idBagTest.Famous_Fan (first_name, last_name) values (?, ?)
Hibernate: insert into idBagTest.famous_fan_team (Team_id, team_fan_id, Famous_Fan_id ) values (?, ?, ?)
Exception in thread "main" java.lang.ClassCastException: org.hibernate.id.IdentifierGeneratorHelper$2 cannot be cast to java.lang.Long
at org.hibernate.type.descriptor.java.LongTypeDescriptor.unwrap(LongTypeDescriptor.java:36)
at org.hibernate.type.descriptor.sql.BigIntTypeDescriptor$1.doBind(BigIntTypeDescriptor.java:57)
at org.hibernate.type.descriptor.sql.BasicBinder.bind(BasicBinder.java:92)
at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:280)
at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:275)
at org.hibernate.persister.collection.AbstractCollectionPersister.writeIdentifier(AbstractCollectionPersister.java:919)
at org.hibernate.persister.collection.AbstractCollectionPersister.recreate(AbstractCollectionPersister.java:1252)
at org.hibernate.action.internal.CollectionRecreateAction.execute(CollectionRecreateAction.java:58)
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:279)
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:1213)
at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:402)
at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.beforeTransactionCommit(JdbcTransaction.java:101)
at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.commit(AbstractTransactionImpl.java:175)
at com.intertech.dao.TeamDaoHibernateImpl.saveTeam(TeamDaoHibernateImpl.java:19)
at com.intertech.Main.main(Main.java:22)
When using the Hibernate 3.1 I get this slightly different stack trace:
Hibernate: insert into Team (id, nickname, mascot) values (null, ?, ?)
Hibernate: insert into Famous_Fan (id, first_name, last_name) values (null, ?, ?)
Hibernate: insert into famous_fan_team (Team_id, team_fan_id, Famous_Fan_id ) values (?, ?, ?)
5120 [main] INFO org.hibernate.type.LongType - could not bind value 'POST_INSERT_INDICATOR' to parameter: 2; org.hibernate.id.IdentifierGeneratorFactory$2 cannot be cast to java.lang.Long
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:1027)
at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:365)
at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:137)
at com.intertech.dao.TeamDaoHibernateImpl.saveTeam(TeamDaoHibernateImpl.java:19)
at com.intertech.Main.main(Main.java:22)

Answer 1

https://hibernate.onjira.com/browse/HHH-397
The use of identity for a generator class in the idBag is apparently not supported when using MySql and Hibernate. Replaced the generator class with increment and got this:
Hibernate: insert into idBagTest.Team (nickname, mascot) values (?, ?)
Hibernate: insert into idBagTest.Famous_Fan (first_name, last_name) values (?, ?)
Hibernate: select max(team_fan_id) from idBagTest.Famous_Fan_Team
Hibernate: insert into idBagTest.Famous_Fan_Team (Team_id, team_fan_id, Famous_Fan_id ) values (?, ?, ?)
The Repository has been updated with the working code.

Answer 2

I have came across the same error,
After some research I came to conclusion that it is depends on two things.
What DB you are using plus
What #GenericGenerator - what strategy you are using.
I was able to resolved issue with following configuration.
DB - MySQL
Changed strategy to increment from native
My code looks like:
#ElementCollection
#JoinTable(name="USERS_ADDRESSES", joinColumns=#JoinColumn(name="USER_ID"))
#GenericGenerator(name="hilogen",strategy="increment")
#CollectionId(columns={#Column(name="ADDR_ID")},generator="hilogen",type=#Type(type="long"))
private List addressList = new ArrayList();
Hope this help.
Thank,
Sagar Vyas