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Calling a rest service with spring rest + json jackson Presenting to you step by step a tutorial about the use of some apis that leverage the logic for calling to a rest service and also the json parting and marshalling process
First Step Importing required libs:

You will need to import spring for droid there are the files:
spring-android-auth-1.0.0.M4.jar
spring-android-core-1.0.0.M4.jar
spring-android-rest-template-1.0.0.M4.jar

You will need to import jackson lib there is the file:
jackson-all-1.9.4.jar

Second Step : Declaring variables
You will need these three variables to do the trick. I will recomend to declare them as fields and instantiate them later on class constructor.

RestTemplate restTemplate = new RestTemplate();
ObjectMapper objectMapper = new ObjectMapper();
JsonFactory jsonFactory = new JsonFactory();

Third step: Calling rest service:

Just call this method of rest template and the api will call the service and will encapsulate all the stream stuff and present you the response as a string file in this example.

String url = "yourjsonrestserviceurl");
String result = restTemplate.getForObject(url, String.class);

Fourth Step: Creating json parser and marshalling the json result into an object

JsonParser jp = jsonFactory.createJsonParser(result);
MappingIterator list = objectMapper.readValues(jp, YourBean[].class);

Finally Some recomendations:
You should get some errors depending of the format of your json. Here are some workarounds:

to map a field with different names:
Add anotation @JsonProperty("yourJSONfield") to the POJO field you want to map.
To ignore a POJO field on marshalling process: @JsonIgnore