flutter type_error ai_generated true

Unhandled exception: IsolateSpawnException: Failed to deserialize message: type 'List<dynamic>' is not a subtype of type 'List<String>'

ID: flutter/isolate-deserialize-list-subtype

Also available as: JSON · Markdown · 中文
83%Fix Rate
81%Confidence
1Evidence
2024-03-05First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
Flutter 3.16+ active — — —
Dart 3.2+ active — — —

Root Cause

Sending a list with generic type information that gets lost during serialization across isolates, causing a type mismatch on deserialization.

generic

中文

发送带有泛型类型信息的列表，在跨隔离区序列化时类型信息丢失，导致反序列化时类型不匹配。

Official Documentation

https://api.dart.dev/stable/dart-isolate/SendPort/send.html

Workarounds

  1. 80% success Cast the list to the expected type after receiving it using List<String>.from() or .cast<String>() with proper error handling. 
    Cast the list to the expected type after receiving it using List<String>.from() or .cast<String>() with proper error handling.
  2. 85% success Use a custom serialization format like JSON encoding/decoding to preserve type information across isolates. 
    Use a custom serialization format like JSON encoding/decoding to preserve type information across isolates.

中文步骤

  1. Cast the list to the expected type after receiving it using List<String>.from() or .cast<String>() with proper error handling.
  2. Use a custom serialization format like JSON encoding/decoding to preserve type information across isolates.

Dead Ends

Common approaches that don't work:

  1. 50% fail

    Adding explicit type annotations to the list variable in the sending code does not guarantee type preservation during serialization.

  2. 30% fail

    Using .cast<String>() on the receiving end after receiving a List<dynamic> may throw if elements are not strings.