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gustavofarias
 Post subject: Hibernate 5: generator class="sequence" not working anymore
PostPosted: Tue Dec 29, 2015 2:43 pm 
Newbie

Joined: Fri Aug 01, 2014 5:54 am
Posts: 13
Location: Brazil
I've always used this in Hibernate 4.3.x:
Code:
<id name="id" column="MY_COLUMN">
   <generator class="sequence">
      <param name="sequence">MY_SEQUENCE</param>
   </generator>
</id>

I migrated to Hibernate 5, and now the query is not referencing my mapping. Here is the SQL that is always generated no matter what sequence I reference:
Code:
select
  hibernate_sequence.nextval
from
  dual

Obviously, the result of this is: "The sequence doesn't exist"

The Hibernate 5.0 Migration Guide says:
Quote:
Deprecated org.hibernate.id.SequenceGenerator and its subclasses

Does it have anything to do with this deprecation?
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vlad
 Post subject: Re: Hibernate 5: generator class="sequence" not working anymore
PostPosted: Wed Dec 30, 2015 2:04 am 
Hibernate Team
Hibernate Team

Joined: Thu Sep 11, 2014 2:50 am
Posts: 1628
Location: Romania
You have to options:

1. You set the hibernate.id.new_generator_mappings configuration property to false and switch back to the old identifier generators
2. You change the mapping as follows:

From this:

Code:
<generator class="sequence">
    <param name="sequence">MY_SEQUENCE</param>
</generator>


to:

Code:
<generator class="org.hibernate.id.enhanced.SequenceStyleGenerator">
    <param name="optimizer">none</param>
    <param name="increment_size">1</param>
    <param name="sequence_name">MY_SEQUENCE</param>
</generator>
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gustavofarias
 Post subject: Re: Hibernate 5: generator class="sequence" not working anymore
PostPosted: Wed Dec 30, 2015 7:53 am 
Newbie

Joined: Fri Aug 01, 2014 5:54 am
Posts: 13
Location: Brazil
It's quite a change not to be documented anywhere. I guess you won't document anything on legacy XML mappings.

It must be something related to version 5.0 because when I was using version 4.3 I had hibernate.id.new_generator_mappings already set to true and it worked fine.

Thanks.
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vlad
 Post subject: Re: Hibernate 5: generator class="sequence" not working anymore
PostPosted: Wed Dec 30, 2015 8:19 am 
Hibernate Team
Hibernate Team

Joined: Thu Sep 11, 2014 2:50 am
Posts: 1628
Location: Romania
I think you should open a Jira issue for this because apart from the enhanced identifiers which have been changed and documented, the old XML definitions are not backward compatible like the annotation ones.

Post a link to this discussion to.
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