Here are people who have contributed to development Jackson JSON process 
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

Bill Burke:

* Reported #11: ContextResolvers don't work for ObjectMapper due over-aggressive caching
 (and provided samples that show how to fix it)
 (2.2.2)

Matt Bishop:

* Reported #12: Missing OSGi imports
 (2.2.2)

Michael Brackx (brackxm@github.com)

* Requested #19: Add `InputStream` as unwritable class
 (2.2.3)

Dain Sundstrom:

* Suggested #6: Add `JaxRSFeature.ADD_NO_SNIFF_HEADER` to automatically add
  X-Content-Type-Options header (works with IE)
 (2.2.3)
