Actually, if an enumDatasource is used as datasource of a combobox field, the error message: "Linking to enums is not supported" is thrown because the method getDefaultConverter is unimplemented.

For every particular enum that is used as the source of a Datasource, a subtype of EnumSelectFieldSupport has to be implemented providing a #defaultConverter() (so the enum values are converted into a presentation String)

It would be also useful to implement an interface translatableEnum with one method String getTranslationKey() which could be implemented/extended by EnumSelectFieldSupport to get the keys for the translations of enum values.

On some IDEs like IntelliJ, it is needed to include the annotation formatter:off - formatter_on between the implementationClass at the module descriptor regarding significant white spaces, it could be useful to include some java code control like trim for avoiding this issue