Spring transaction REQUIRED vs REQUIRES NEW Rollback Transaction

Question

I have a method that has the propagation   Propagation REQUIRES NEW transactional property    Transactional propagation   Propagation REQUIRES NEW  public void createUser final UserBean userBean          Some logic here that requires modification in DB       This method can be called multiple times simultaneously  and for every transaction if an error occurs than it s rolled back  independently from the other transactions    The problem is that this might force Spring to create multiple transactions  even if another one is available  and may cause some performance problems     Java doc of propagation   Propagation REQUIRED says  Support a current transaction  create a new one if none exists   This seems to solve the performance problem  doesn t it   What about the rollback issue   What if a new method call rolls back while using an existing transaction   won t that rollback the whole transaction even the previous calls     EDIT  I guess my question wasn t clear enough   We have hundreds of clients connected to our server    For each client we naturally need to send a feedback about the transaction  OK or exception -  rollback     My question is  if I use REQUIRED  does it mean only one transaction is used  and if the 100th client encounters a problem the 1st client s transaction will rollback as well

User · Accepted Answer

Using REQUIRES NEW is only relevant when the method is invoked from a transactional context  when the method is invoked from a non-transactional context  it will behave exactly as REQUIRED - it will create a new transaction    That does not mean that there will only be one single transaction for all your clients - each client will start from a non-transactional context  and as soon as the the request processing will hit a  Transactional  it will create a new transaction    So  with that in mind  if using REQUIRES NEW makes sense for the semantics of that operation - than I wouldn t worry about performance - this would textbook premature optimization - I would rather stress correctness and data integrity and worry about performance once performance metrics have been collected  and not before    On rollback - using REQUIRES NEW will force the start of a new transaction  and so an exception will rollback that transaction  If there is also another transaction that was executing as well - that will or will not be rolled back depending on if the exception bubbles up the stack or is caught - your choice  based on the specifics of the operations   Also  for a more in-depth discussion on transactional strategies and rollback  I would recommend    Transaction strategies  Understanding transaction pitfalls    Mark Richards

User · Answer

If you really need to do it in separate transaction you need to use REQUIRES NEW and live with the performance overhead  Watch out for dead locks   I d rather do it the other way    Validate data on Java side  Run everyting in one transaction  If anything goes wrong on DB side -  it s a major error of DB or validation design  Rollback everything and throw critical top level error  Write good unit tests

[java] Spring transaction REQUIRED vs REQUIRES_NEW : Rollback Transaction

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