update JAVA client using Gson instead of org.json that has a dubious license
update JAVA client using Gson instead of org.json that has a dubious license

julien6387/supervisors,julien6387/supvisors,julien6387/supvisors,julien6387/supervisors,julien6387/supervisors,julien6387/supvisors,julien6387/supvisors,julien6387/supervisors