Hibernate generates negative id values when using a sequence

Question

I have a class with the following definition:

@Id
@SequenceGenerator(name = \"SEQ_ACE_WORKERS_QUEUE_STATS_ID\", sequenceName = \"SEQ_ACE_WORKERS_QUEUE_STATS_         


        

Answer 1

I just ran into this issue when migrating from JBoss 6.1 to JBoss 7.1.

According to the JBoss AS 7.1 JPA documentation ( https://docs.jboss.org/author/display/AS71/JPA+Reference+Guide#JPAReferenceGuide-Persistenceunitproperties),

JBoss 7.1 automatically sets several hibernate properties. One of the properties being set is hibernate.id.new_generator_mappings which activates new ID generators that use different algorithms and are not backwards compatible. Setting this property to false in your persistence.xml file will restore the old ID generator behavior.

The hibernate 4 documentation also has information regarding the new ID generators: http://docs.jboss.org/hibernate/core/4.0/manual/en-US/html_single/#mapping-declaration-id-generator.

The hibernate documentation clearly states that the new ID generators are not enabled by default, but, as noted above, JBoss 7.1 is automatically enabling them.