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https://issues.apache.org/jira/browse/FLINK-34996?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hugo Gu updated FLINK-34996:
----------------------------
Summary: Custom Deserializer can't be instantiated when connector-kafka
installed into Flink Libs (was: Deserializer can't be instantiated when
connector-kafka installed into Flink Libs)
> Custom Deserializer can't be instantiated when connector-kafka installed into
> Flink Libs
> ----------------------------------------------------------------------------------------
>
> Key: FLINK-34996
> URL: https://issues.apache.org/jira/browse/FLINK-34996
> Project: Flink
> Issue Type: Bug
> Components: Connectors / Kafka
> Reporter: Hugo Gu
> Priority: Minor
> Attachments: image-2024-04-03-17-34-00-120.png,
> image-2024-04-03-17-37-55-105.png
>
>
> The current implementation of the
> KafkaValueOnlyDeserializerWrapper Class instantiates Deserializer from the
> ClassLoader of the KafkaValueOnlyDeserializerWrapper itself as following
> figure shows.
>
> !image-2024-04-03-17-34-00-120.png|width=799,height=293!
>
> In case of both following conditions are met:
> 1. The connector-kafka get installed into Libs of Flink (rather than in the
> User Jar)
> 2. The user jar defines a customized Deserializer for Kafka Record.
>
> The instantiation of the custom deserializer will fail due to NoClassFound
> exception because it is indeed not available in the system class loader.
>
> As following figure illustrates
>
> !image-2024-04-03-17-37-55-105.png|width=413,height=452!
>
> It can be fixed by using either UserCodeClassLoader or the ClassLoader of
> current Thread.
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