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https://issues.apache.org/jira/browse/IGNITE-3429?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15673619#comment-15673619
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Fred commented on IGNITE-3429:
------------------------------

That hurts pushing it to 2.0, I havent found a solid way of getting Hibernate 
L2 cache working:
http://stackoverflow.com/questions/38132263/apache-ignite-as-hibernate-l2-cache-storing-duplicate-entities
http://stackoverflow.com/questions/40140645/apache-ignite-hibernate-sessionfactory-serialization-issue
https://issues.apache.org/jira/browse/IGNITE-1794
http://apacheignite.gridgain.org/docs/binary-marshaller

> org.hibernate.cache.spi.CacheKey not properly serialized by binary marshaller
> -----------------------------------------------------------------------------
>
>                 Key: IGNITE-3429
>                 URL: https://issues.apache.org/jira/browse/IGNITE-3429
>             Project: Ignite
>          Issue Type: Bug
>          Components: cache
>    Affects Versions: 1.6
>            Reporter: Valentin Kulichenko
>            Priority: Critical
>             Fix For: 2.0
>
>
> {{org.hibernate.cache.spi.CacheKey}} is a class used as a key for all entries 
> in the Hibernate L2 cache. This class contains {{type}} field and custom 
> {{equals}} logic where the type is used as a helper and does not participate 
> in comparison. Instances of the same type are producing different hash codes 
> in different JVMs, which actually breaks comparison when binary format is 
> used, where byte arrays are compared.
> The issue is described in more detail here: 
> http://stackoverflow.com/questions/38132263/apache-ignite-as-hibernate-l2-cache-storing-duplicate-entities



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