jamesfredley commented on PR #15548:
URL: https://github.com/apache/grails-core/pull/15548#issuecomment-4180133056

   @jdaugherty 
   
   You're right - Groovy proxies 
(`GroovyProxyFactory`/`ProxyInstanceMetaClass`) are not the default proxy 
mechanism for Hibernate. The TCK `GroovyProxySpec` is `@IgnoreIf` for both H5 
and H7 with the comment: *"this test is ignored because Groovy proxies are not 
used with Hibernate"*.
   
   Hibernate uses its own proxy mechanism (ByteBuddy/Javassist `HibernateProxy` 
instances). H7's `ByteBuddyGroovyProxyFactory` creates Hibernate proxies 
enhanced with Groovy-aware interception - these are NOT "Groovy proxies" in the 
`GroovyProxyFactory` sense.
   
   However, H5's `HibernateProxyHandler.isInitialized()` already had a 
defensive `ProxyInstanceMetaClass` check 
([here](https://github.com/apache/grails-core/blob/spring-boot-4/grails-data-hibernate5/core/src/main/groovy/org/grails/orm/hibernate/proxy/HibernateProxyHandler.java))
 to handle the edge case where someone overrides the `proxyFactory` (as 
`Hibernate7GroovyProxySpec` demonstrates by manually setting `proxyFactory = 
new GroovyProxyFactory()`). Without this check, `Hibernate.isInitialized()` 
returns `true` for any non-`HibernateProxy` object - silently giving wrong 
answers for Groovy proxies.
   
   This PR restores that same defensive behavior in H7's handler for parity.


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