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Do we need to stub the other micro service in Spring cloud contract

#marcin
I am doing a pilot on implementing the spring cloud contract for Micro services which has around 50+ services talking to each other. I have few questions which I haven't found the answer precisely in your document.
The service which I am building has controller which processes and transforms my input payload to the desired output in json format. This json is used to build desired structure that should match the response in groovy (Our contract). However the controller, is sending json to another services with some URL as shown below.
request_url=http://localhost:8090/services/rest/transact/v2/pay/validate/0000118228/new response_body=null
Basically it is expecting the Response back from the other service by making use of this json and now response_body=null
My question is do I need to create a stub or mock the service? to make use of this response as an input to produce expected output from the response. Basically the microservice is expecting a ServiceResponse.
Another question is do we need to load in-memory data while doing the contract testing or do we need to just test the controller itself?

I don't really follow your description... "The service which I am building has controller which transforms my input payload sent from groovy and giving the desired output in json format" . Sent from which groovy? Groovy application? Can you explain that in more depth?
But I guess I can try to answer the question anyways...
My question is do I need to create a stub or mock the service? to make use of this response as input to produce expected output from the response. It is expecting a ServiceResponse.
If I understand correctly - service you mean a class not an application? If that's the case then, yes, in the controller I would inject a stubbed service.
Another question is do we need to load in-memory data while doing the contract testing or do we need to just test the controller itself?
That's connected with the previous answer. Your controller doesn't delegate work to any real implementation of a service, so no access to the DB takes place. If you check out the samples (https://github.com/spring-cloud-samples/spring-cloud-contract-samples/blob/master/producer/src/test/java/com/example/BeerRestBase.java) you'll see that the base class has mocks injected to it and no real integration takes place
EDIT:
"The service which I am building has controller which transforms my input payload sent from groovy and giving the desired output in json format" is actually the description of what is done via the Spring Cloud Contract generated test. The next sentence was
However the controller, is sending json to another services with some URL as shown below.
In Contract testing, I don't care what your controller further on does. If it's in the controller where you send the request to some other application then you should wrap it in a service class. Then such a service you would mock out in your contract tests. What we care about in the Contract tests is whether we can communicate. Not whether the whole end to end functionality is working correctly.

Mock request/response to/from external REST service

One of my application's methods uses javax.ws.rs.Client to POST a request with an XML payload to an external REST service and receive back an XML response. I then convert this response to JSON and return it to the method caller. How do I write a unit test that mocks out the external REST service, so I can focus on sending an XML payload, receiving back an XML response which is converted to JSON, so I can look for a specific property in the JSON to pass the test? I need to use Mockito testing framework.
I imagine the test method would need access to sample XML request and XML response strings (w/ hard coded values). If so, where would I store these strings which are a bit lengthy, particularly the response?

Restful web service to take complex object as input

How can i pass a complex object like Person class as an input parameter in restful web service??
I have gone through many links but didnt find the solution. Please help

Transform the object into JSON or XML (or any other format, but these are the most common), and send it into the body of the request.

There are Restful Client api's available in java
1.JAX-RS-API-->JersyImpl,Resteasy(Jboss) Impl etc
You can use any of these and can pass any java object as input to restful resource.

Pass object as arument in RESTful web service

I am creating a simple RESTful web service with simple types successfully. Now I want to pass an object as argument for web service and get the object as response. My scenario is, Parse the XML message as object by using Jaxb and send the object as request for web service. After that in server side it process the requested object and generates the response xml file and send back it as object.
In URL path i give
"http://localhost:8080/SampleWS/rest/checkXML/username=visolve&password=visolve"
for simple type. But in object I don't know how to give the object reference in URL. Please help me how to solve my problem..
Regards
Bathakarai

Just define a very good-looking domain object. JAXB and JAX-RS will do the rest.
JAXB.
#XmlRootElement
class Regards {
#XmlElement
private long sincerely;
}
JAX-RS.
#Consumes({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
#POST
#Path("/sincerely")
#Produces({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
public Response sincerely(final Regards regards) {
regards.setSincerely(System.currentTimeMillis());
return Response.ok(regards).build();
}

Though you could certainly include the entire XML content in your URL, I would probably shy away from it.
Think of it this way: if you encode the XML in the URL you're potentially adding more work on both ends. Now the server and client will both need to know how to build the URL properly, and check to make sure everything lines up correctly. What if, in the future, you need to offer a JSON or YAML view of the same content? Now your URL might need to include the content-type as well. What about character-encoding?
All this to say, HTTP provides a terrific transport mechanism which already addresses these concerns. Include the XML as the entity body of the HTTP message, and use the HTTP header to identify what content-type you're sending, character-encoding, etc. This will work both ways (the server and client both can send the XML back/forth), and makes better use of HTTP.
Here's a related link which might help with some of the details. And another.
On a side note, please, please, please tell me you don't plan on sending user-credentials in plain text across an unencrypted link.

How to obtain data from a webservice in a JSF action method?

I'm trying to determine the correct API calls on FacesContext to do the following when processing a backing bean action:
Within the action method construct a URL of dynamic parameters
Send the constructed URL to service
Parse the returned service response parameters
Continue with action method processing based on reponse string from request.
Any suggestions on the highlevel API calls for steps 2 and 3 to send me in the right direction would be very appreicated. Note, the service I'm calling is external to this application in a blackbox. Instructions are: send URL in specified format, parse response to see what happened.

This problem is not specific to JSF in particular, so you'll find nothing in JSF API. The standard Java API offers java.net.URL or, which allows more fine grained control, java.net.URLConnection to fire HTTP requests and obtain the response as an InputStream which you can then freely parse the usual Java way.
InputStream response = new URL("http://google.com").openStream();
// ...
Depending on the content type of the response, there may be 3rd party API's which ease the parsing. For example, Google Gson if it's JSON or Jsoup if it's HTML/XML.