Feign makes writing java http clients easier
Java JsonPath implementation
A fast JSON parser/generator for Java.
A reference implementation of a JSON package in Java.
Generate Java types from JSON or JSON Schema and annotate those types for data-binding with Jackson, Gson, etc
A JSON Schema validation implementation in pure Java, which aims for correctness and performance, in that order
JSON to JSON transformation library written in Java.
JSON Schema validator for java, based on the org.json API