concurrency - @Version in hibernate, when running in cluster env does not work...(Optimistic Lock) -

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i have entity uses @version on 1 of fields, want achieve if 2 transactions modify entity in same time, 1 fail(and optimistic lock exception) , other succeed.

when run test on single jvm works fine, when run in cluster env, 2 transactions succeed , no optimistic lock thrown. 

public class deploymentlock  {      @column(name = "deployment_counter")     private long deploymentcounter;      @version     @column(name = "entity_version")     private long version;     ... }

am missing something? need use "@generated(generationtime.always)" under @version?

im using spring , hibrnate in app way... idea?

if have 2 instances of deploymentlock inside of 2 different hibernate sessions (usually in 2 different jvms or on 2 different hosts) each same version value, 2nd of updates call should throw hibernateoptimisticlockingfailureexception.

basically hibernate doing like:

update deploymentlock set deploymentcounter = ..., version = 2 version = 1

then if update did not change row exception thrown.

are sure 2 different jvms (or 2 sessions) have same instance same version value? there refresh() somewhere don't expect or maybe race conditions causing 2nd instance query return updated deploymentlock?

maybe add logging or println debugging print version value right before update. if show versions same can edit post show how making update call?


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