matrei opened a new issue, #16483:
URL: https://github.com/apache/grails-core/issues/16483
### Expected Behavior
As with GORM for Hibernate 5, `Domain.proxy(id)` returns an uninitialized
proxy attached to the current session. The proxy loads its state the first time
a property is accessed.
### Actual Behaviour
Accessing any property of the proxy throws, even inside a transaction:
```
org.hibernate.LazyInitializationException: Could not initialize proxy
[app.Book#1] - no session
at
org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:178)
at
org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:348)
at
org.hibernate.proxy.pojo.bytebuddy.ByteBuddyInterceptor.call(ByteBuddyInterceptor.java:45)
at
org.hibernate.proxy.pojo.BasicLazyInitializer.invoke(BasicLazyInitializer.java:88)
at
org.grails.orm.hibernate.proxy.ByteBuddyGroovyInterceptor.intercept(ByteBuddyGroovyInterceptor.java:88)
...
```
`HibernateGormStaticApi.proxy(Serializable)` delegates to
`HibernateProxyHandler.createProxy(Session, Class, Serializable)`, which
returns `Hibernate.createDetachedProxy(sessionFactory, type, key)`. A detached
proxy is not associated with any session, so it can never initialize itself.
In GORM for Hibernate 5, `proxy()` goes through
`AbstractHibernateSession.proxy()`, which calls `hibernateTemplate.load(type,
key)` and returns a proxy attached to the current session. GORM for Hibernate 7
originally did the same (`Session#getReference`), but switched to
`createDetachedProxy` in 1fb626ba18 ("hibernate 7: Partial ByteBuddy
implementation").
The existing tests that access properties on a proxy
(`Hibernate7GroovyProxySpec`) switch to `GroovyProxyFactory` first, so the
default `HibernateProxyHandler` path is not covered.
### Steps To Reproduce
```groovy
class Book {
String title
}
```
```groovy
@Integration
class ProxySpec extends Specification {
@Rollback
void 'proxy can be initialized inside a transaction'() {
given:
def id = new Book(title: 'Grails').save(flush: true).id
Book.withSession { it.clear() }
when:
def book = Book.proxy(id)
then:
book.title == 'Grails' // LazyInitializationException on Hibernate
7, passes on Hibernate 5
}
}
```
### Environment Information
- JDK 21 (Liberica 21.0.12)
- Hibernate 7.4.10.Final
- H2 database
### Example Application
Found by the integration tests of the
[grails-logical-delete](https://github.com/grails-plugins/grails-logical-delete)
plugin, which run against both GORM for Hibernate 5 and Hibernate 7
(`examples/app1-hibernate7`).
### Version
8.0.0-RC2
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