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https://issues.apache.org/jira/browse/IGNITE-5444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16061579#comment-16061579
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William Do commented on IGNITE-5444:
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I believe the issue is to do with the serialized form, which in this case the
desired outcome is to be stored as a {{SingletonList}} of binary objects.
The same issue also occurs for {{Collections.unmodifiableList}}. I think
ideally we want to add these types to both {{BinaryUtils.knownCollection}} and
{{BinaryUtils.isSpecialCollection}}. The latter is the one being used to
identify serialization of collection types.
However both of these are private static classes within {{Collections}} and I
am not quite sure how to proceed yet.
> Collections.singletonList is not properly serialized by binary marshaller
> -------------------------------------------------------------------------
>
> Key: IGNITE-5444
> URL: https://issues.apache.org/jira/browse/IGNITE-5444
> Project: Ignite
> Issue Type: Bug
> Components: general
> Affects Versions: 2.0
> Reporter: Valentin Kulichenko
> Assignee: William Do
> Fix For: 2.1
>
> Attachments: BinaryObjectSingletonList.java
>
>
> Test attached. {{Collections.singletonList}} is apparently serialized by
> optimized marshaller, because when deserialized, it doesn't return collection
> of binary objects, but rather collection of deserialized objects.
> Most likely the reason for this is that {{Collections.singletonList}} is not
> recognized by {{BinaryUtils.knownCollection}} method.
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