borinquenkid opened a new pull request, #16784:
URL: https://github.com/apache/grails-core/pull/16784

   Fixes #16783. Port of #16763 to grails-data-hibernate5 on 7.0.x.
   
   ### Changes
   - Pre-acquire outer session physical connection before entering 
`executeWithNewSession`, ensuring that lazy-loaded associations on entities 
managed by the outer session do not borrow an inner transaction's connection.
   - Register a `TransactionSynchronization` at `SESSION_SYNCHRONIZATION_ORDER` 
(-100) when synchronization is active to disconnect the session prior to 
Spring's JDBC `ConnectionSynchronization` cleanup (order 1000).
   - Fall back to `SessionFactoryUtils.convertHibernateAccessException` when 
`convertJdbcAccessException` returns `null` in 
`convertHibernateAccessException`.
   - Promote `isTransactional` in `GrailsDataHibernate5TckManager` to an 
instance property to support testing non-transactional OSIV request sessions.
   - Add test coverage in `WithNewSessionLazyLoadSpec` and 
`GrailsHibernateTemplateSpec`.


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