Bug: GlobalIdPK cache is not clear when transaction rollback has been performed

[YaraslauBarysenka]

Expectations versus reality

Preconditions

• We use Javers 2.7.1 version.
• A database have already populated with data.
• Transaction has been started.
• Audit has happened.
• The transaction is failed and the transaction rollback was performed.

Expected Result

• The globalIdPkCache (in GlobalIdRepository class) should be cleared when a transaction rollback was performed.

Current Result

• Necessary rows were rollbacked from jv_global_id table, but globalId is present in cache(GlobalIdRepository class). When we try to make audit with an entity from previoust transaction and javers commit operation get globalId from cashe, the globalId is not present in database. If that Javers tries to create new snapshot then we receive an exception(see exception here: exception.txt), because Javers inserts not existing primary key.

Runnable test case

The application to reproduce issue here: javers-bug-example.zip

Please, read an instruction about how to reproduce the issue using the application here: instrution.txt

P. S.

If you have questions, please let's me know.
Guys, thank you for your work. It is very helpful for us.
Thank you in advance.

[bartoszwalacik]

First, thanks for a high quality bug report. You are right, this cache is simply non-transactional. Did you looked at javers source ? Maybe you are eager to contribute a Pull Request with a fix?

[bartoszwalacik]

Making this cache transactional could be hard. Maybe good error handling is enough, cache clean + retry

[YaraslauBarysenka]

Sorry, we don't have enough resources to make a pull request.
As workaround, could you please provide possibility set custom cashe to storage GlobalIdPK?

Provide method to set custom cache by interface when we build Javers object and make public method to get this cashe?

Like this:
interface Cache {
// .. methods
}

Cache customCache = new CustomCacheImpl();
JaversBuilder.javers().setCache(customCache).build();

[bartoszwalacik]

I will provide a method to evict the cache, you will be calling this method after doing rollback, ok?

[edmallia]

Would it be possible to expose configuration to configure the cache including disabling it ?

[YaraslauBarysenka]

It is nice to make possibility to evict a cache, but would be great to make a cache configurable.

[bartoszwalacik]

ok, disable switch for the cache seems reasonable

[bartoszwalacik]

The easy part is done, now we should configure Spring Transaction Manager to call our new cache evict() method when a SQL transaction is rolled back.
I don't know how to do it. I've posted a question on stack: http://stackoverflow.com/questions/40812130/how-application-can-be-notified-when-spring-transaction-manager-rollbacks-a-sql
Maybe someone from you Guys can help?