Hi Suresh,
sorry my bad, I read "remove" instead of "retrieve" :(
Currently you cannot get all the properties of a Task through the REST api. What you can get is the task key for an individual task instance:
GET /task/{id}/form
We are currenlty working on the "BPMN Model API" which we plan on releasing along with alpha3.
The BPMN Model API can be found here:
Additional Documentation is here:
Once we add JSON support and REAST Api integration for the BPMN model api I will be very straight forward to get access to all the properties of a task using the rest API.
In the meantime you would have to write your custom REST service in which you could leverage the BPMN model API.
Cheers,
Daniel Meyer