Here are people who have contributed to the development of Jackson JSON processor
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 G�linas:
  * Reported [JACKSON-827]: 2.0.0 was accidentally requiring JDK 1.6
    (should still be 1.5)
   (2.0.1)

Ben Gertzfield (bgertzfield@github):
  * Contributed [Issue#49]: Improvements to VersionUtil to more efficiently
    read dynamically generated/embedded version information, to improve
    Android startup time
   (2.2.0)

Klaus Brunner (KlausBrunner@github)
  * Reported [Issue#48]: Problem with URLs, spaces

Eugene Brevdo (ebrevdo@github)
  * Contributed #84: Support 'Infinity' as alternative (no leading plus)
   (2.2.3)

Marcin Zukowski (eruure@github)
  * Reported #115: JsonGenerator writeRawValue problem with surrogate UTF-8 characters
   (2.3.0)

Steve van Loben Sels
  * Reported #116: WriterBasedJsonGenerator produces truncated Unicode escape sequences
   (2.3.0)

Shay Banon
  * Reported #145: NPE at BytesToNameCanonicalizer
   (2.4.2)

rjmac@github
  * Reported #146: Error while parsing negative floats at the end of the input buffer
   (2.4.2)
  * Reported #148: BytesToNameCanonicalizer can mishandle leading null byte(s).
   (2.5.0)

Alex Soto: (lordofthejars@github)
  * Reported #173: An exception is thrown for a valid JsonPointer expression
   (2.4.5)

Aaron Digulla:
  * Contributed #166: Allow to configure line endings and indentation
   (2.5.0)

Derek Clarkson (drekka@github)
  * Reported #184: WRITE_NUMBERS_AS_STRINGS disables WRITE_BIGDECIMAL_AS_PLAIN
   (2.4.6 / 2.5.2)

Masaru Hasegawa (masaruh@github):
  * Reported, contributed fix for#182: Inconsistent TextBuffer#getTextBuffer behavior
   (2.6.0)

Ruediger Moeller (RuedigerMoeller@github)
  * Requested #195: Add `JsonGenerator.getOutputBuffered()` to find out amount of content buffered,
     not yet flushed.
   (2.6.0)

Florian Schoppmann (fschopp@github@github)
  * Reported #207: `ArrayIndexOutOfBoundsException` in `ByteQuadsCanonicalizer`
   (2.6.1)

Iskren Ivov Chernev (ichernev@github)
  * Reported #213: Parser is sometimes wrong when using CANONICALIZE_FIELD_NAMES
   (2.6.2)

Michael Lehenbauer (mikelehen@github)
  * Reported #37: JsonParser.getTokenLocation() doesn't update after field names
   (2.7.0)

Lokesh Kumar N (LokeshN@github)
  * Contributed #209: Make use of `_allowMultipleMatches` in `FilteringParserDelegate`
   (2.7.4)
  * Contributed fix for #117: Support for missing values (non-compliant JSON)
   (2.8.0)
  * Contributed implementation for #86: Allow inclusion of request body for JsonParseException
   (2.8.0)
  * Contributed implementation for #285: Allow inclusion of request body for JsonParseException
   (2.8.0)

Tanguy Leroux (tlrx@github)
  * Reported, contributed fix for #280: FilteringGeneratorDelegate.writeUTF8String()
    should delegate to writeUTF8String()
   (2.7.5)

Mike Naseef (mtnaseef@github)
  * Reported #307: JsonGenerationException: Split surrogate on writeRaw() input thrown for
   input of a certain size
   (2.7.7)

Allar Haav (haav@github)
  * Reportef #317: ArrayIndexOutOfBoundsException: 200 on floating point number with exactly
  200-length decimal part
   (2.7.8)

Mikael Staldal (mikaelstaldal@github)
  * Contributed fix for #265: `JsonStringEncoder` should allow passing `CharSequence`
   (2.8.0)

Kevin Gallardo (newkek@github)
  * Reported #296: JsonParserSequence skips a token on a switched Parser
   (2.8.0)

Alessio Soldano (asoldano@github)
  * Contributed #322: Trim tokens in error messages to 256 byte to prevent attacks
   (2.8.6)

Arnaud Roger (arnaudroger@github)
  * Contributed #359: FilteringGeneratorDelegate does not override writeStartObject(Object forValue)
   (2.8.8)

Alex Yursha (AlexYursha@github)
  * Contributed #312: Add `JsonProcessingException.clearLocation()` to allow clearing
    possibly security-sensitive information
   (2.9.0)

Brad Hess (bdhess@github)
  * Contributed #323: Add `JsonParser.ALLOW_TRAILING_COMMA` to work for Arrays and Objects
   (2.9.0)
  * Reported #325: `DataInput` backed parser should handle `EOFException` at end of doc
   (2.9.0)

Logan Widick (uhhhh2@github)
  * Contributed #17: Add 'JsonGenerator.writeString(Reader r, int charLength)'
   (2.9.0)

Michael Sims (MichaelSims@github)
  * Reported, contributed fix for #372: JsonParserSequence#skipChildren() throws exception
   when current delegate is TokenBuffer.Parser with "incomplete" JSON
   (2.9.0)