[FLINK-9052] Flink complains when scala.Option is used inside POJO

• Type: Bug
• Status: Open
• Priority: Not a Priority
• Resolution: Unresolved
• Affects Version/s: 1.4.2
• Component/s: API / Type Serialization System
• Labels: auto-deprioritized-major auto-deprioritized-minor
• Assignee: Unassigned
• Reporter: Truong Duc Kien
• Created: 22/Mar/18 04:22
• Updated: 08/Dec/21 22:38

Description

According to the documentation, Flink has a specialized serializer for Option type. However, when an Option field is used inside a POJO, the following WARNING appears in TaskManagers' log.

 

No fields detected for class scala.Option. Cannot be used as a PojoType. Will be handled as GenericType