[IGNITE-9201] Immutables derived values aren't properly set on deserialization

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Not A Problem
• Affects Version/s: 2.6
• Component/s: cache
• Ignite Flags: Docs Required
• Assignee: Unassigned
• Reporter: Glen Takahashi
• Created: 06/Aug/18 23:31
• Updated: 07/Aug/18 18:08
• Resolved: 07/Aug/18 18:08

Description

When using the @Value.Derived annotation for an Immutables class, the Immutables-generated class implementation sets those values as `transient` because they are meant to be constructed by the builder. 

Because Ignite ignores transient variables when marshalling to a BinaryObject, and also because Ignite uses reflection to unmarshal from a BinaryObject, those transient variables are left uninitialized in the returned Immutables object from the cache.

One idea would be instead to use an ObjectMapper and store a string/json representation in the cache and deserialize manually with the ObjectMapper, but was hoping there would be a better way to natively support Immutables and/or Jackson-serializable objects by not using Reflection in some cases.