On this EclipseLink MOXy Example explains about converting a java object to JSON string and JSON string to java Object Using EclipseLink MOXy library.

EclipseLink MOXy component enables Java developers to efficiently bind Java classes to XML Schemas. MOXy implements JAXB allowing developers to provide their mapping information through annotations as well as providing support for storing the mappings in XML format. The many advanced mappings enable developers to handle the complex XML structures without having to mirror the schema in their Java class model.

Reference -> www.eclipse.org/eclipselink/moxy.php

Here I am showing an example about How to convert a Java Object to JSON string and vice versa using EclipseLink MOXy.