ianroberts opened a new issue, #16665:
URL: https://github.com/apache/grails-core/issues/16665
### Expected Behavior
Given a set of domain classes like the following:
```groovy
// Role.groovy
class Role {
String authority
}
// Tag.groovy
class Tag {
String name
String description
}
// Item.groovy
class Item {
String name
static hasMany = [roles: Role, tags: Tag]
}
```
the following sequence of method calls should 1. create an item, 2. create a
role, 3. add a row to the `item_role` join table linking the two
```groovy
def item = new Item(name: "Example item")
item.save(flush: true)
def role = new Role(authority: "ROLE_EXAMPLE")
item.addToRoles(role)
item.save(flush: true)
```
### Actual Behaviour
With Hibernate 5 the join table insert happens as expected, but with
Hibernate 7 it does not - the `Item` and `Role` are created and the second
`item.save` issues the expected SQL `UPDATE` to the `item` table, but it does
_not_ persist the `addToRoles` in the join table.
If I remove the `tags` entry from `hasMany` (so the `Item` class only has
_one_ unidirectional one-to-many association rather than two) then the correct
behaviour is observed on both Hibernate versions.
### Steps To Reproduce
See my [example
repository](https://github.com/ianroberts/grails-h7-multiple-hasmany) - this
has two Grails applications that are identical except that one uses Hibernate 5
and the other uses Hibernate 7. They declare two versions of the `Item` class,
one as above with `static hasMany = [roles: Role, tags: Tag]` and the other
(`UntaggedItem`) with just `static hasMany = [roles: Role]`, and perform the
above steps in `BootStrap` with Hibernate SQL logging enabled
- create the item
- `findOrCreate` the role
- `addToRoles`
- save and flush
On Hibernate 5 both `Item` and `UntaggedItem` log the correct join table
inserts
```
2026-10-17T19:00:35.544+01:00 INFO 1214 --- [ restartedMain]
com.example.BootStrap : ======== Creating Item =========
2026-10-17T19:00:35.628+01:00 DEBUG 1214 --- [ restartedMain]
org.hibernate.SQL : insert into item (id, version, name)
values (default, ?, ?)
2026-10-17T19:00:35.652+01:00 INFO 1214 --- [ restartedMain]
com.example.BootStrap : Created com.example.Item : 1
2026-10-17T19:00:35.653+01:00 INFO 1214 --- [ restartedMain]
com.example.BootStrap : findOrCreate example role
2026-10-17T19:00:35.658+01:00 WARN 1214 --- [ restartedMain]
org.hibernate.orm.deprecation : HHH90000022: Hibernate's legacy
org.hibernate.Criteria API is deprecated; use the JPA
jakarta.persistence.criteria.CriteriaQuery instead
2026-10-17T19:00:35.676+01:00 DEBUG 1214 --- [ restartedMain]
org.hibernate.SQL : select this_.id as id1_3_0_,
this_.version as version2_3_0_, this_.authority as authorit3_3_0_ from role
this_ where (this_.authority=?) limit ?
2026-10-17T19:00:35.679+01:00 INFO 1214 --- [ restartedMain]
com.example.BootStrap : Add role to item
2026-10-17T19:00:35.680+01:00 INFO 1214 --- [ restartedMain]
com.example.BootStrap : Save and flush
2026-10-17T19:00:35.684+01:00 DEBUG 1214 --- [ restartedMain]
org.hibernate.SQL : insert into role (id, version,
authority) values (default, ?, ?)
2026-10-17T19:00:35.736+01:00 DEBUG 1214 --- [ restartedMain]
org.hibernate.SQL : update item set version=?, name=?
where id=? and version=?
2026-10-17T19:00:35.738+01:00 DEBUG 1214 --- [ restartedMain]
org.hibernate.SQL : insert into item_role
(item_roles_id, role_id) values (?, ?)
2026-10-17T19:00:35.740+01:00 INFO 1214 --- [ restartedMain]
com.example.BootStrap : ======== Creating UntaggedItem
=========
2026-10-17T19:00:35.742+01:00 DEBUG 1214 --- [ restartedMain]
org.hibernate.SQL : insert into untagged_item (id,
version, name) values (default, ?, ?)
2026-10-17T19:00:35.743+01:00 INFO 1214 --- [ restartedMain]
com.example.BootStrap : Created com.example.UntaggedItem : 1
2026-10-17T19:00:35.743+01:00 INFO 1214 --- [ restartedMain]
com.example.BootStrap : findOrCreate example role
2026-10-17T19:00:35.743+01:00 WARN 1214 --- [ restartedMain]
org.hibernate.orm.deprecation : HHH90000022: Hibernate's legacy
org.hibernate.Criteria API is deprecated; use the JPA
jakarta.persistence.criteria.CriteriaQuery instead
2026-10-17T19:00:35.744+01:00 DEBUG 1214 --- [ restartedMain]
org.hibernate.SQL : select this_.id as id1_3_0_,
this_.version as version2_3_0_, this_.authority as authorit3_3_0_ from role
this_ where (this_.authority=?) limit ?
2026-10-17T19:00:35.745+01:00 INFO 1214 --- [ restartedMain]
com.example.BootStrap : Add role to item
2026-10-17T19:00:35.745+01:00 INFO 1214 --- [ restartedMain]
com.example.BootStrap : Save and flush
2026-10-17T19:00:35.746+01:00 DEBUG 1214 --- [ restartedMain]
org.hibernate.SQL : update untagged_item set version=?,
name=? where id=? and version=?
2026-10-17T19:00:35.746+01:00 DEBUG 1214 --- [ restartedMain]
org.hibernate.SQL : insert into untagged_item_role
(untagged_item_roles_id, role_id) values (?, ?)
```
On Hibernate 7 only the `UntaggedItem` logs the join table inserts:
```
2026-10-17T19:01:52.908+01:00 INFO 1446 --- [ restartedMain]
com.example.BootStrap : ======== Creating Item =========
2026-10-17T19:01:52.989+01:00 DEBUG 1446 --- [ restartedMain]
org.hibernate.SQL : insert into item (name,version,id)
values (?,?,default)
2026-10-17T19:01:53.019+01:00 INFO 1446 --- [ restartedMain]
com.example.BootStrap : Created com.example.Item : 1
2026-10-17T19:01:53.019+01:00 INFO 1446 --- [ restartedMain]
com.example.BootStrap : findOrCreate example role
2026-10-17T19:01:53.120+01:00 DEBUG 1446 --- [ restartedMain]
org.hibernate.SQL : select
r1_0.id,r1_0.authority,r1_0.version from role r1_0 where r1_0.authority=?
2026-10-17T19:01:53.129+01:00 INFO 1446 --- [ restartedMain]
com.example.BootStrap : Add role to item
2026-10-17T19:01:53.130+01:00 INFO 1446 --- [ restartedMain]
com.example.BootStrap : Save and flush
2026-10-17T19:01:53.135+01:00 DEBUG 1446 --- [ restartedMain]
org.hibernate.SQL : insert into role
(authority,version,id) values (?,?,default)
2026-10-17T19:01:53.157+01:00 DEBUG 1446 --- [ restartedMain]
org.hibernate.SQL : update item set name=?,version=?
where id=? and version=?
2026-10-17T19:01:53.162+01:00 INFO 1446 --- [ restartedMain]
com.example.BootStrap : ======== Creating UntaggedItem
=========
2026-10-17T19:01:53.164+01:00 DEBUG 1446 --- [ restartedMain]
org.hibernate.SQL : insert into untagged_item
(name,version,id) values (?,?,default)
2026-10-17T19:01:53.165+01:00 INFO 1446 --- [ restartedMain]
com.example.BootStrap : Created com.example.UntaggedItem : 1
2026-10-17T19:01:53.165+01:00 INFO 1446 --- [ restartedMain]
com.example.BootStrap : findOrCreate example role
2026-10-17T19:01:53.166+01:00 DEBUG 1446 --- [ restartedMain]
org.hibernate.SQL : select
r1_0.id,r1_0.authority,r1_0.version from role r1_0 where r1_0.authority=?
2026-10-17T19:01:53.166+01:00 INFO 1446 --- [ restartedMain]
com.example.BootStrap : Add role to item
2026-10-17T19:01:53.167+01:00 INFO 1446 --- [ restartedMain]
com.example.BootStrap : Save and flush
2026-10-17T19:01:53.168+01:00 DEBUG 1446 --- [ restartedMain]
org.hibernate.SQL : update untagged_item set
name=?,version=? where id=? and version=?
2026-10-17T19:01:53.169+01:00 DEBUG 1446 --- [ restartedMain]
org.hibernate.SQL : insert into untagged_item_role
(untagged_item_roles_id,role_id) values (?,?)
```
and you can verify with the scaffolded `ItemController` whether the
associations have been saved.
> Note: the test is one `hasMany` vs two, but I am seeing the same issue in
my real app for classes that have three different `hasMany` links, so it does
look like an issue of one vs more-than-one, rather than two vs not-two
### Environment Information
- Operating system: macOS Tahoe 26.6.2
- JDK: Azul Zulu JDK 21
```
openjdk version "21.0.12.1" 2026-08-18 LTS
OpenJDK Runtime Environment Zulu21.52+203-CA (build 21.0.12.1+1-LTS)
OpenJDK 64-Bit Server VM Zulu21.52+203-CA (build 21.0.12.1+1-LTS, mixed
mode, sharing)
```
### Example Application
https://github.com/ianroberts/grails-h7-multiple-hasmany
### Version
8.0.0
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