1.
gson
https://sites.google.com/site/gson/gson-user-guide
2.
<dependency>
<groupId>org.glassfish</groupId>
<artifactId>javax.json</artifactId>
<version>1.0.4</version>
</dependency>
<dependency>
<groupId>javax.json</groupId>
<artifactId>javax.json-api</artifactId>
<scope>provided</scope>
<version>1.0</version>
</dependency>
http://www.oracle.com/technetwork/articles/java/json-1973242.html
3.
JSON-LIB