We have multiple workspaces that write to ArcGIS Online with multipart geometries. The old ARCGISONLINEFEATURES writer works and correctly writes the geometries. The new (2025) Esri ArcGIS Feature Service Writer returns an error rejecting the features and the following warning:
ArcGISFeatureServiceWriter: INSERT error for a feature in Project Stats by State. The error code from the server was '1000' and the message was 'Adding/updating geometries that result in SQL GeometryCollections is currently not supported (SQL Server performance).'
Using a Deaggregator seems to fix this in most cases. However, we want to retain the multipart geometries. In other cases, I see a similar warning and the following error after using a Deaggregator:
ArcGISFeatureServiceWriter: INSERT error for a feature in Terracon Offices Closest Areas. The error code from the server was '1000' and the message was 'Data is Null. This method or property cannot be called on Null values.'
I’ve tried a NullAttributeMapper and only writing a single column that I know has 0 NULLs and see the same error and warning. Has anyone ran into these issues with the new writer? If so, have you found a workaround?