We ran into an issue with the 2.4.0 release because it replaced DataSourceTransactionManager with JdbcTransactionManager. The latter does exception translation:

• Use JdbcTransactionManager in favor of DatasourceTransactionManager #23572 / 9293b26
• DataSourceTransactionManager does not consider SQLExceptionTranslator on commit spring-framework#24064 (comment)

This led to a DuplicateKeyException exception being thrown rather than a TransactionSystemException. We didn't expect this because we had explicitly disabled exception translation:

spring.dao.exceptiontranslation.enabled=false

Perhaps DataSourceTransactionManager should continue to be used if this property is set to false?