Zappos-json is a Java library that can be used to convert plain old Java objects (POJO) into their JSON representation, and vice versa. It uses code generation technique to improve the performance by inlining serialization-related code into a generated class file.
An incremental Json-to-Json transformation library written in Java
A Java centric library to transform and map JSON documents
Jsonification is a JSON processing library for Java.
EasyGson is a wrapper for Gson that allows near-native, pure JSON handling for Java applications
A Java8 library used to parse and generate json