Here are people who have contributed to development Jackson JSON processor
databind core component, version 2.x
(version numbers in brackets indicate release in which the problem was fixed)

(note: for older credits, check out release notes for 1.x versions)

Tatu Saloranta, tatu.saloranta@iki.fi: author

Pascal Glinas:
  * Contributed fixes to 'MappingIterator' handling (Pull#58 and Pull#59)
   (2.1.0)
  * Reported #220: ContainerNode missing 'createNumber(BigInteger)'
   (2.2.2)

Joern Huxhorn:
  * Suggested [JACKSON-636]: Add 'SerializationFeature.ORDER_MAP_ENTRIES_BY_KEYS' to allow
    forced sorting of Maps during serialization
   (2.0.0)

James Roper:
 * Requested [JACKSON-732]: Allow 'AnnotationIntrospector.findContentDeserializer()'
    (and similar) to return instance, not just Class<?> for instance
  (2.0.0)
 * Suggested [JACKSON-800]: Adding a method for letting modules register
    DeserializationProblemHandlers
  (2.0.0)

Casey Lucas:
 * Reported [JACKSON-798]: Problem with external type id, creators
  (2.0.0)

Tammo van Lessen:
 * Reported [JACKSON-811]: Problems with @JsonIdentityInfo, abstract types
  (2.0.0)
 * Reported [JACKSON-814]: Parsing RFC822/RFC1123 dates failes on non-US locales
  (2.0.0)

Raymond Myers:
 * Suggested [JACKSON-810]: Deserialization Feature: Allow unknown Enum values via
    'DeserializationFeature.READ_UNKNOWN_ENUM_VALUES_AS_NULL'
  (2.0.0)

Ryan Gardner:
 * Contributed [pull-5] -- Add support for maps with java.util.Locale keys
    to the set of StdKeyDeserializers
  (2.0.1)

Razvan Dragut:
 * Suggested [JACKSON-850]: Allow use of zero-arg factory methods as "default creator"
  (2.1.0)

Duncan Atkinson:
 * Reported [JACKSON-851]: State corruption with ObjectWriter, DefaultPrettyPrinter
  (2.1.0)

Mark Wolfe:
 * Suggested [Issue#45]: Add `@JsonNaming()` for per-class naming strategy overrides
  (2.1.0)

Dmitry Katsubo:
 * Contributed patch for [Issue#65]: Add getters to `ObjectMapper`, DeserializationContext,
   DeserializationFactory.
  (2.1.0)

Francis Galiegue:
 * Reported [Issue#93] (and suggested fix): bug in `ObjectMapper.setAll(...)'
  implementation
  (2.1.1)

kelaneren@github:
 * Reported [Issue#157], contributed unit test: NPE when registering same module twice.
  (2.1.4)

Eric Tschetter (cheddar@github):
  * Reported issues #166, #167, #170 (regressions from 1.9.x to 2.x)
   (2.1.4)

Thierry D (thierryd@github)
  * Reported #214: Problem with LICENSE, NOTICE, Android packaging
   (2.2.2)

Luke G-H (lukegh@github)
  * Reported #223: Duplicated nulls with @JsonFormat(shape=Shape.ARRAY)
   (2.2.2)

Karl Moore (karldmoore@github)
  * Reported #217: JsonProcessingExceptions not all wrapped as expected
   (2.2.2)
