nested exception is javax.persistence.RollbackException: Error while commiting the transaction
2017-05-06 09:30
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org.springframework.transaction.TransactionSystemException: Could not commit JPA transaction; nested exception is javax.persistence.RollbackException: Error while commiting the transaction
遇到这个问题，网上找了半天，还是没有解决，然后又出现这个问题。
更换了 xwork-core-2.1.6.jar为更新版本后，更是出现版本兼容问题，只好又还原回2.1.6。
最后只好逐个排除。代码段全部注释掉，通过，逐个恢复，也通过，最后发现竟然是 @Transactional 对应函数 传入参数时传入了空值。。。
调用上面函数时，传入 vipCars时， 赋值错误，下面是错误赋值，改为正确赋值后，就没有问题了。
遇到这个问题，网上找了半天，还是没有解决，然后又出现这个问题。
更换了 xwork-core-2.1.6.jar为更新版本后，更是出现版本兼容问题，只好又还原回2.1.6。
最后只好逐个排除。代码段全部注释掉，通过，逐个恢复，也通过，最后发现竟然是 @Transactional 对应函数 传入参数时传入了空值。。。
调用上面函数时，传入 vipCars时， 赋值错误，下面是错误赋值，改为正确赋值后，就没有问题了。
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