I have updated the hiberate version from 4.0.1.Final to 5.0.7.Final (porting from Jboss 7 to Wildfly 10)
The hibernate framwork uses hibernate_sequence for the id generation instead of mySequence.
In order to maintain the backward compatibility, hibernate.id.new_generator_mappings is configured as false value.
The id field is annotated with the following JPA API:
The MY_GENERATOR_SEQ sequence is defined with the "INCREMENT BY 1" option.
The problem occurs for both H2 and Oracle DB.
I have analyzed the implementation and I don't know if it could be a BUG of Hibernate or any possible bad configuration i did for the backward compatibility???
Hibernate during server startup gets some initialization:
SequenceStyleGenerator.configure method defines the QualifiedName sequenceName as "hibernate_sequence", because it tried to get the value from the Properties params.
At this point I noticed that the MY_GENERATOR_SEQ sequenceName was present into the Properties params at runtime with the "sequence" key (sequence=MY_GENERATOR_SEQ) but the retrieve strategy (determineSequenceName) needs the "sequence_name" as key.
So the key used to set the sequence name into the Properties params is from the deprecated class org.hibernate.id.SequenceGenerator.SEQUENCE because of hibernate.id.new_generator_mappings=false,
but the SequenceStyleGenerator class needs the org.hibernate.id.enhanced.SequenceStyleGenerator.SEQUENCE_PARAM key in order to get "MY_GENERATOR_SEQ".
1. set on SequenceGenerator allocationSize=1 (without setting hibernate.id.new_generator_mappings=false)
2. create the sequence MY_GENERATOR_SEQ on the DB with INCREMENT BY 50 (without setting hibernate.id.new_generator_mappings=false)
Both the solutions are not applicable into my context.
So the only applicable "solution" is this one:
Extend the Dialect used for Oracle and H2 and override the getNativeIdentifierGeneratorClass method in this way:
H2 and Oracle
An easier workaround is to use:
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "myGenerator")
Unfortunately the problem is strongly related to the impossibility of update the Entity classes in my context. The suggested solution works and also the posted potential solution 1 and 2, but I can't update the Entities.
I can confirm this is also happening (not surprisingly) with 5.0.6.Final
It seems fixed with HHH-10876