[jira] [Updated] (IGNITE-13639) .NET: Type cast exception on cache.Get with an array of empty Lists

["Pavel Tupitsyn (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-13639?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Pavel Tupitsyn updated IGNITE-13639:
------------------------------------
    Summary: .NET: Type cast exception on cache.Get with an array of empty Lists  (was: .NET: No coercion operator is defined between types 'System.Int32' and 'swagger.Models.IndexParameter[]'.)

> .NET: Type cast exception on cache.Get with an array of empty Lists
> -------------------------------------------------------------------
>
>                 Key: IGNITE-13639
>                 URL: https://issues.apache.org/jira/browse/IGNITE-13639
>             Project: Ignite
>          Issue Type: Bug
>          Components: platforms
>    Affects Versions: 2.9
>         Environment: Apache Ignite: v2.9.0
> JDK: v1.8
> .NET Core: v3.1
>            Reporter: Danut Radoaica
>            Assignee: Pavel Tupitsyn
>            Priority: Critical
>              Labels: .NET, 2.9.1-rc
>             Fix For: 2.11
>
>         Attachments: BotXEntityDto.cs, ConsoleApp1.zip, exception.txt, stream_dump.txt
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> [^exception.txt] contains the stack trace
> [^stream_dump.txt]  contains the stream that fails, dumped using System.Text.Encoding.UTF8.GetString
> [^BotXEntityDto.cs] contains the dto definition
> Minimal reproducer:
> {code}
> using System.Collections.Generic;
> using Apache.Ignite.Core;
> var ignite = Ignition.Start();
> var cache = ignite.GetOrCreateCache<int, Entity[]>("c");
> cache.Put(1, new[]
> {
>     new Entity {Inner = new List<object>()},
>     new Entity {Inner = new List<object>()}
> });
> cache.Get(1);
> class Entity
> {
>     public IList<object> Inner { get; set; }
> }
> {code}
> Works on 2.8.0, fails on 2.9.1.
> The problem is that IGNITE-12827 has changed the detach semantics for arrays and collections, and this revealed the problem on .NET side: array and collection elements can share handles (same object references), which is a problem, because Java handles every element separately. And the bug occurs because an empty list has {{_items}} initialized to a shared empty array instance.
> *Workaround*: use {{List<Entity>}} instead of {{Entity[]}}



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