Here are people who have contributed to development of JSON Schema generator
module of Jackson JSON processor 
(version numbers in brackets indicate release in which the problem was fixed)

Ignacio del Valle Alles (idelvall@github):

#24: Improved Schema generation for Maps
 (2.3.0)

Anton O (mavarazy@github)

#35: Add annotation based support for HyperSchema to JsonSchema
 (2.4.1)

Greg Adams (gadams00@github)

#47: VisitorContext results in incomplete json schema output
 (2.4.4)
