Hello! Thanks for the MCVE -- I could reproduce your symptoms easily! Even when you're using JSON encoding, you should use a GenericDatumReader<> to read generic datum.
The Json.ObjectReader sounds correct but is actually for a different JSON use case (storing any arbitrary JSON snippet in a known, valid Avro schema). The error message is not very helpful, unfortunately, but points to the differences between the first UNION in your record and the Json.avsc that Json.ObjectReader implicitly assumes. I hope this helps! Ryan On Thu, Jul 30, 2020 at 7:30 PM Stefan Radu Popescu <[email protected]> wrote: > > Hello, > > I am having an issue with reading a GenericDatum from a json String written > with avro GenericDatumWriter. > > Exception as in title. > MCVE and details at: > https://gist.github.com/PopescuStefanRadu/cea799614ba49b753238b77ac4b242e5 > > Avro versions tested: > > 1.9.2, 1.10.0 > > Java runtime: > > openjdk 14.0.1 2020-04-14 > OpenJDK Runtime Environment (build 14.0.1+7-Ubuntu-1ubuntu1) > OpenJDK 64-Bit Server VM (build 14.0.1+7-Ubuntu-1ubuntu1, mixed mode, sharing) > > Compiled towards: java 11. > > I'd be very grateful if you could help me out. > > Thank you, > Stefan Popescu
