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parse error when listening to notifications #6
Description
This is what I call:
final NotificationPoller bucketNotificationPoller = _otpMinio.listenBucketNotification(
_userBucket,
prefix: 'Dido_otp/',
events: <String>['s3:ObjectCreated:*'],
);
This is the error I get:
[ERROR:flutter/lib/ui/ui_dart_state.cc(171)] Unhandled Exception: FormatException: Unexpected character (at character 1)
<?xml version="1.0" encoding="UTF-8"?>
^
#0 _ChunkedJsonParser.fail (dart:convert-patch/convert_patch.dart:1404:5)
#1 _ChunkedJsonParser.parseNumber (dart:convert-patch/convert_patch.dart:1271:9)
#2 _ChunkedJsonParser.parse (dart:convert-patch/convert_patch.dart:936:22)
#3 _parseJson (dart:convert-patch/convert_patch.dart:40:10)
#4 JsonDecoder.convert (dart:convert/json.dart:505:36)
#5 JsonCodec.decode (dart:convert/json.dart:156:41)
#6 NotificationPoller._checkForChanges (package:minio/src/minio_poller.dart:61:25)
<asynchronous suspension>
#7 NotificationPoller.start (package:minio/src/minio_poller.dart:30:13)
#8 Minio.listenBucketNotification (package:minio/src/minio.dart:432:14)
Activity
arrrrny commentedon Oct 22, 2026
Fixed in the fork. MinIO answers a notification listener with XML, and
upstream called
json.decodeon it:The poller understands both formats now — the XML that older MinIO servers
send and the JSON that current ones send — and it also drops the events the
server replays when the listener reconnects, which made every event arrive
twice.
arrrrny commentedon Oct 22, 2026
This ships in zuraffa_minio — the maintained fork of this package, which upstream has not touched since August 2025.
The fork keeps the API of the original package unchanged, so moving over is an import swap:
Source, the changelog and the sweep of the open issues of this tracker: https://github.com/arrrrny/zuraffa_minio