Bug in describe sensor and insert sensor

[rahulworld]

Actual Behaviour
at the time of sensor registration, Describe sensor, Insert observation, Get observation(java core istSOS methods) in service getting error in android-demo where json object are using for data transmitting and having null values.

Expected Behaviour
for the expected behaviour of any service user can get information using describe sensor(get Name, Assigned Id, Description, keywords),get observation(observation data), register sensor,insert observation.

Steps to reproduce it
for fixing this bug i am working on java core istSOS. where json object are using for data transmiting and
parsing having null values.