JpaSystemException v TransactionTimedOutException超时

Question

我试图了解两种例外之间的区别

1: org.springframework.orm.jpa.JpaSystemException: transaction timeout expired; nested exception is org.hibernate.TransactionException: transaction timeout expired

似乎在超过@Transactional（... timeout = n）值时发生，并且

2: org.springframework.transaction.TransactionTimedOutException: Transaction timed out: deadline was <date>

我重试了一次多次（1）超时的交易，从而引起了这种情况。