Jackson Work in Progress

Jackson WIP

This page is a "living document" of on-going work, mostly by @cowtowncoder (Tatu), although other committers are welcome to update it as well.

Contents are divided in 4 sections, of actionable (*) things:

1. Urgent things -- security problems, correctness (corruption), reliability (threading/concurrency)
2. Simple things -- low(er) hanging fruits that are likely easily fixable but also important (i.e. non-trivial)
3. Important -- things that important strategically, or highly "voted", but that are more involved to fix/implement.
4. Big Ideas

as well as one "Recently Completed" addendum.

(*) actionable meaning, in general, that progress is only/mostly limited by time available and not by inherent difficulty, or lack of design or ideas of how to tackle the need.

Last updates

• 15-Dec-2018, tatu: With release 2.9.8, trim down "recently completed"
• 29-Oct-2018, tatu: Create the initial version

Urgent things

Jackson 3.0: test failures for jackson-modules-base?

Jackson 2.10

• https://github.com/FasterXML/jackson-core/issues/479: rewrite BufferRecycler fix
• https://github.com/FasterXML/jackson-core/issues/498: better Java 9+ module name support with moditect Maven plug-in (https://github.com/moditect/moditect)

Simple Things

• Jackson 3.0
  • Streaming
    • Remove mutability of JsonGenerator
  • Databind
• Jackson 2.10
  • Streaming
    • Change JsonGenerator.Feature.ESCAPE_NON_ASCII to be based on JsonWriteFeature.ESCAPE_NON_ASCII
    • https://github.com/FasterXML/jackson-core/issues/464: Add "maximum unescaped char" limit option in CharacterEscapes
  • Databind
    • https://github.com/FasterXML/jackson-databind/pull/2196: Type safety wrt TypeReference, ObjectMapper.readValue()
  • Dataformats
    • https://github.com/FasterXML/jackson-dataformats-binary/issues/73: References to nested types
  • Other
    • (java 8 date/time) https://github.com/FasterXML/jackson-modules-java8/pull/92: (Java 8 date/time) format support for Duration (maybe?)
    • https://github.com/FasterXML/jackson-dataformat-xml/issues/311: (XML) namespace binding issue
    • https://github.com/FasterXML/jackson-dataformat-xml/issues/325: (XML) polymorphic ids
• Jackson 2.9
  • Other:

Important Things

• Jackson 3.0:
  • https://github.com/FasterXML/jackson-databind/issues/2177: Change parent type of JsonProcessingException to be RuntimeException (maybe UncheckedIOException?)
  • Finish partial rewrite of JsonFormat.Shape handling to support ALL changes (POJO to/from non-POJO), for types AND properties
• Jackson 2.10:
  • https://github.com/FasterXML/jackson-databind/issues/2189: Bounds checks (int, long) for TreeTraversingParser (and verify TokenBuffer's too)
  • https://github.com/FasterXML/jackson-core/issues/500: allow "optional padding" for base64 (not just required/not-allowed choices)

Big Ideas

We should have something like "Jackson Big Ideas", maybe similar to Kafka KIPs. Not unlike IETF RFCs, but bit smaller documents.

Ideas are listed on [Jackson3+Changes)]

1. JsonNode revamp
2. JacksonException to replace JsonProcessingException; unchecked not checked
3. Major version upgrade details (Maven, Java package)
4. Jackson 3.x default setting changes (Features esp)

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Recently completed

Here are things since December 2018, after release of 2.9.8 (except for 3.0 some earlier too)

2.9

2.10

Jackson 3.0

• https://github.com/FasterXML/jackson-databind/issues/2176: add JsonMapper.shared() (and ditto for other mappers) (10-Dec-2018)