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Make UUID generation the default (AUTO) for UUID type

Description

Report from the discussion started here
http://lists.jboss.org/pipermail/hibernate-dev/2015-January/012082.html

The idea was to support UUID generation when @GeneratedValue(AUTO) is set on a UUID property. I proposed String too but Steve is more skeptical.

Another aspect is to bind the UUID property to the native UUID type in the database. This is related to and

A final and related aspect is to make the AUTO/IDENTITY/SEQUNCE generation mapping to be customizable based on data like the (OGM) dialect and the type. For example OGM would plug an implementation that uses MongoDB ObjectId generation for IDENTITY.

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AL October 27, 2016 at 2:49 PM

I believe I found the solution. I needed to mark my UUID types with type "uuid-binary". Verified that this generates they type as bytea in Postgres and that i can read records from my existing database.

@Id
@GeneratedValue(generator = "uuid2")
@GenericGenerator(name = "uuid2", strategy = "uuid2")
@Type(type = "uuid-binary")
private UUID id;

AL October 26, 2016 at 10:05 PM

For those of us upgrading from Hibernate 4 to 5, how are we supposed to keep the Hibernate 4 behavior as right now the upgrade is not backwards compatible with the existing schema.

See: http://stackoverflow.com/questions/40272819/hibernate-5-breaks-legacy-handling-of-java-uuid-in-postgresql

Thank you.

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Created January 20, 2015 at 3:32 PM
Updated October 27, 2016 at 2:49 PM
Resolved March 21, 2015 at 7:45 PM