前言

• 使用Spring事務時，出現異常：org.springframework.transaction.UnexpectedRollbackException: Transaction rolled back because it has been marked as rollback-only
• 這個錯誤正確的理解應為：在提交事務時，發現該事務已經回滾了！！！
• 通常該錯誤發生在事務嵌套時，異常被中途捕獲，導致上層的事務提交時失敗。

部分錯誤日志

19:29:37.202 [http-nio-80-exec-11] ERROR c.o.f.w.e.GlobalExceptionHandler - [notFount,64] - 運行時異常: org.springframework.transaction.UnexpectedRollbackException: Transaction rolled back because it has been marked as rollback-onlyat org.springframework.transaction.support.AbstractPlatformTransactionManager.processRollback(AbstractPlatformTransactionManager.java:873)at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:710)at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:533)at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:304)at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98)

分析代碼

異常拋出的代碼片段（org.springframework.transaction.support.AbstractPlatformTransactionManager.processRollback）：

/*** Process an actual rollback.* The completed flag has already been checked.* @param status object representing the transaction* @throws TransactionException in case of rollback failure*/private void processRollback(DefaultTransactionStatus status, boolean unexpected) {try {boolean unexpectedRollback = unexpected;try {triggerBeforeCompletion(status);if (status.hasSavepoint()) {if (status.isDebug()) {logger.debug("Rolling back transaction to savepoint");}status.rollbackToHeldSavepoint();}else if (status.isNewTransaction()) {if (status.isDebug()) {logger.debug("Initiating transaction rollback");}doRollback(status);}else {// Participating in larger transactionif (status.hasTransaction()) {if (status.isLocalRollbackOnly() || isGlobalRollbackOnParticipationFailure()) {if (status.isDebug()) {logger.debug("Participating transaction failed - marking existing transaction as rollback-only");}doSetRollbackOnly(status);}else {if (status.isDebug()) {logger.debug("Participating transaction failed - letting transaction originator decide on rollback");}}}else {logger.debug("Should roll back transaction but cannot - no transaction available");}// Unexpected rollback only matters here if we're asked to fail earlyif (!isFailEarlyOnGlobalRollbackOnly()) {unexpectedRollback = false;}}}catch (RuntimeException | Error ex) {triggerAfterCompletion(status, TransactionSynchronization.STATUS_UNKNOWN);throw ex;}triggerAfterCompletion(status, TransactionSynchronization.STATUS_ROLLED_BACK);// Raise UnexpectedRollbackException if we had a global rollback-only markerif (unexpectedRollback) {throw new UnexpectedRollbackException("Transaction rolled back because it has been marked as rollback-only");}}finally {cleanupAfterCompletion(status);}}

通過這段代碼，可以看出，出現了非預期的回滾（unexpectedRollback）。

似懂非懂了。

再看看調用processRollback方法的org.springframework.transaction.support.AbstractPlatformTransactionManager.commit方法中的代碼片段：

/*** This implementation of commit handles participating in existing* transactions and programmatic rollback requests.* Delegates to {@code isRollbackOnly}, {@code doCommit}* and {@code rollback}.* @see org.springframework.transaction.TransactionStatus#isRollbackOnly()* @see #doCommit* @see #rollback*/@Overridepublic final void commit(TransactionStatus status) throws TransactionException {if (status.isCompleted()) {throw new IllegalTransactionStateException("Transaction is already completed - do not call commit or rollback more than once per transaction");}DefaultTransactionStatus defStatus = (DefaultTransactionStatus) status;if (defStatus.isLocalRollbackOnly()) {if (defStatus.isDebug()) {logger.debug("Transactional code has requested rollback");}processRollback(defStatus, false);return;}if (!shouldCommitOnGlobalRollbackOnly() && defStatus.isGlobalRollbackOnly()) {if (defStatus.isDebug()) {logger.debug("Global transaction is marked as rollback-only but transactional code requested commit");}processRollback(defStatus, true);return;}processCommit(defStatus);}

這段代碼的中心思想，是要提交事務。但，陰差陽錯的沒有提交事務。
調用processRollback前有這樣一句話：Global transaction is marked as rollback-only but transactional code requested commit(全局事務標記為僅回滾，但事務代碼請求提交)。

結合上下文理解為：在提交事務時，發現該事務已經回滾了。所以，必須拋出錯誤。

總結

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