[dahauns]

Why would you write any of this yourself?

This is the classic use case for code generation. (And IMO one of the few justified ones.)

[anonymoushn]

It seems like the more common approach among people who use Java is to write the 300 LOC across the 8 files then use the library to generate JSON schema, rather than the other way around. I wrote it myself because I did not want to tell my team that they had been doing things wrong for years before trying their approach once.