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https://issues.apache.org/jira/browse/FLINK-25971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17488191#comment-17488191
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Francesco Guardiani commented on FLINK-25971:
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I don't think this is causing any leaks, as the {{OBJECT_MAPPER_INSTANCE}} is
clearly using only the [planner
classloader|https://github.com/apache/flink/blob/2e910a66a92c3bfec2dd4abfa8d0d7a01b727f4d/flink-table/flink-table-planner/src/main/java/org/apache/flink/table/planner/plan/nodes/exec/serde/JsonSerdeUtil.java#L97]
and, with FLINK-25385, it won't serialize user functions anymore.
> org.apache.flink.table.planner.plan.nodes.exec.serde.JsonSerdeUtil#OBJECT_MAPPER_INSTANCE
> might cause class leaks
> -----------------------------------------------------------------------------------------------------------------
>
> Key: FLINK-25971
> URL: https://issues.apache.org/jira/browse/FLINK-25971
> Project: Flink
> Issue Type: Sub-task
> Reporter: Yun Gao
> Priority: Major
>
> It might need a double check if
> JsonSerdeUtil#OBJECT_MAPPER_INSTANCE -> DefaultDeserializationContext
> _deserializationContext -> extends DeserializationContext ->
> DeserializerCache _cache -> _cachedDeserializers / _incompleteDeserializers
> might hold user ClassLoaders
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