Abstract type for Converted values

[fedorov (Sergey Fedorov)]

Hi Otabek,

You need to properly declare a datatype class, e.g.:
ComplexPojoTypeDatatype implements Datatype<ComplexPojoType>
etc.
Jmix cannot recognise your class as a datatype and considers it as an entity, which leads to the error.

You can check out the docs on custom types here:

Support for Custom Java Type - Datatype Interface :: Jmix Documentation

Also you can look for solution in previous forum topics, for example:

How to write custom DataType and Converter

Hi Nurmuhammad, Thank you for the test project. Your converter is incorrect, the DB type should not be String. Try the following implementation, it works for me: @Converter(autoApply = true) public class JsonAttributeConverter implements AttributeConverter<JsonPojo, PGobject> { private Gson gson = new GsonBuilder().setPrettyPrinting().create(); @Override public PGobject convertToDatabaseColumn(JsonPojo object) { if (object == null) return null; try { …

Regards,
Sergey.