Jackson

Raised as a usability problem by 3 people on Hacker News over 7 years (2019–2025), in 4 threads.

People raised many different problems with Jackson, but no single problem has yet been raised by 3 people in 3 different months and threads.

Unreviewed issues were grouped by machine: Claude Haiku labelled each comment as a usability complaint, named what it's about and summed up the problem in a line, and a small model grouped similar problems. Nobody has checked them by hand. Expect mistakes.

The newest 4 complaints

No official documentation; users must hunt scattered third-party tutorials to learn it2025-04-09
Annotations are hard to research; docs don't explain how combined options interact2022-03-01
Serialization silently fails on type-erased generics; the compiler gives no warning until runtime2022-01-18
Annotation errors are hard to track down; adding a field needs lots of trial and error2019-02-01