jackson

(note: offshoot of #3455 -- read for background)

It looks like JDK's HttpURLConnection has unfortunate handling of some error cases, leading to leakage of not-fully-closed HTTP connections under some error conditions. See #3455 for details.

It seems like we might be able to handle some of those cases, specially readValue() variants of ObjectMapper / ObjectReader by using something li

Jsoniter project (https://github.com/plokhotnyuk/jsoniter-scala) has many impressive performance optimizations; linked f.ex from here:

https://www.reddit.com/r/java/comments/darehu/jackson_release_210/f1ysf1e/

Of ones included, number-parsing would be relevant for this repo.

EDIT: also see (from the comment below)

"Unrelated to jsoniter but this recent port of Lemire's Double parser:

Tools like jq are focused predominantly on their use on the command line, but have a lot of limitations (and bugs!) that jslt doesn't. This is a compliment to jslt btw. :)

To properly replace the usage of jq with jslt, we would like to be able to have some more flexibility with the ways of specifying the input parameters as well as the output.

• Specifying JSON input or JSLT transform input

With a file

---
description: 400 - The request was malformed or missing a required field.
content:
  application/json:
    schema: { $ref: '#definitions/BadRequestResponse' }

definitions:
  BadRequestResponse:
    description: Optional information about how the request was bad.
    type: object
    properties:
      fieldName:
        description: >-
          If this error

InstantSerializer doesn't respect any of the following standard Jackson configuration settings:

ObjectMapper#setDateFormat
@JsonFormat(pattern) on an Instant
others?

Instead, I have to create and manually override the default InstantSerializer registered by the module.

This isn't well documented and is definitely confusing when using the library.
Can we make InstantSerializer

It would be nice to have a CSV feature similar to JSON feature JsonGenerator.Feature.WRITE_NUMBERS_AS_STRINGS. Enabling of the feature by mapper.enable(JsonGenerator.Feature.WRITE_NUMBERS_AS_STRINGS) doesn't work for CSV.

I want to write an object of this class:

data class TestData(
        val integer: Int,
        val float: Float
}

as
"1","1.234"
not as
1,1.234