Hibernate 为什么以下代码在org.springframework.dao.DuplicateKeyException中失败

以下代码在带有的最后一行失败

//following code is executed from non-transactional service
Member member = Member.get(1)
try{
    Member.withNewTransaction {
        throw new RuntimeException("error")
    }
}catch(Exception e) {
    //handle exception
}
member.username = "Fred"
member.save()

我不认为这段代码会失败，因为异常会导致TX回滚，但它被捕获，因此流会传递到下一个语句。实际情况是，从发生异常和回滚的点开始，任何后续保存都会失败，并出现

DuplicateKeyException

我认为这与hibernate会话有关，当回滚发生时，hibernate会话会被破坏，并且hibernate无法再持久化任何附加到此会话的内容（错误是误导性的）

有人能更详细地解释一下到底发生了什么，以及处理这起案件的最佳做法是什么吗？

到目前为止，我找到了3种解决方案：

解决方案#1-将事务置于其自己的会话中

org.springframework.dao.DuplicateKeyException: a different object with the same identifier value was already associated with the session: [com.test.Member#1]; nested exception is org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session: [com.test.Member#1]

解决方案#2-在回滚发生后重新选择成员

Member.withNewSession {
    Member.withNewTransaction {
        throw new RuntimeException("error")
    }
}

解决方案#3启动主事务

member = Member.get(member.id)
member.username = "Fred"
member.save()

Member.withTransaction {
    Member member = Member.get(1)
    try {
        Member.withNewTransaction {
            throw new RuntimeException("error")
        }
    } catch(Exception e) {
        //handle exception
    }
    member.username = "Fred"
    member.save()
}