Using JsonParser.Feature.* ?

[oschrenk]

Is there currently a way to enable features such as JsonParser.Feature.ALLOW_TRAILING_COMMA (this is how you know I have to deal with malformed json)?

[travisbrown]

@oschrenk It's not currently possible off the shelf, but it also wouldn't be terribly difficult. I think this is something we'll want to add at some point, so if you have ideas or would like to discuss an implementation, that would be excellent.

[netvl]

It is actually possible to do this, if you explicitly extend the necessary traits:

object CustomJacksonParser extends WithJacksonMapper with JacksonParser {
  mapper.configure(SomeFeatures.SOME_FEATURE, true)
}

Then you just use this object instead of the default io.circe.jackson object to parse JSON:

CustomJacksonParser.decode[YourType](input)

Although this does feel quite hacky.

[netvl]

Apparently my above code only works for deserializer features, because circe creates a separate JsonFactory specifically to do parsing and does not use the mapper's own factory to do the parsing (just curious, what is the reason for this?), and this separate JsonFactory does not use features enabled in the original mapper. I see no other way around right now except for reflection.

[travisbrown]

@netvl I'm not sure why there's a separate JsonFactory. I created this project as a port of Play JSON's Jackson parsing because there was demand for a Jackson-based circe parsing module, but I've never needed it for myself (or anyone who was paying me), so it's not received a huge amount of attention. I'll happily review any PRs, though.