davidkron opened a new issue, #14521:
URL: https://github.com/apache/grails-core/issues/14521
I wanted to create a hierarchy of classes with the **table per subclass**
strategy (see example below). Since we have common functionality in our domain
classes, we have an **abstract base class** that is extended by all other
domain classes.
Note: if I remove the abstract base class from the hierarchy, the
application starts and works as expected.
### Task List
- [x] Steps to reproduce provided
- [x] Stacktrace (if present) provided
- [x] Example that reproduces the problem uploaded to Github
- [x] Full description of the issue provided (see below)
### Steps to Reproduce
Put the following classes in the grails domain folder.
```
abstract class BaseEntity {
// common behavior for all entities in the application
}
class X extends BaseEntity {
static mapping = {
tablePerHierarchy false
}
}
class A extends X {
static hasMany = [bs: B]
}
class B extends X {
A a
}
```
### Expected Behaviour
I think the given class hierarchy is not that complex and pretty common and
should just work.
### Actual Behaviour
An exception is thrown during application boot.
```
Caused by: org.hibernate.MappingException: Entities [example.A] and
[example.B] are mapped with the same discriminator value 'null'.
at
org.hibernate.persister.entity.SingleTableEntityPersister.addSubclassByDiscriminatorValue(SingleTableEntityPersister.java:450)
at
org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:424)
... 57 common frames omitted
```
### Environment Information
- **Operating System**: Windows 10
- **GORM Version:** 7.0.1
- **Grails Version (if using Grails):** Grails 3.3.10
- **JDK Version:** 8
### Example Application
The 4 given classes under "Steps to Reproduce" are sufficient to reproduce
the exception in a newly created grails application.
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