解决Transaction is already completed - do not call commit or rollback more than once per transaction问题

问题         在看《Spring揭秘》事务章节内容,调试代码过程当中,出现如下异常:html 19/01/29 14:41:31 [main]: DEBUG datasource.DataSourceTransactionManager: Creating new transaction with name [ChansonTransaction]: PROPAGATION_REQUIRE
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