If you want to consume the RestFul services you can check Wei Zhou’s posts in the documents section of the documentum developer network (Documentum) or check EMC RestFul Services — Clients JAVA by astone to see an example of how to consume the JSON directly from JAVA.

However, while developing the Android app I found that it was way easier to go the old Java-objects way, and you can do this by using GSON (or any other similar library).

First, you’ll need to create the POJOs/Beans for the classes; as we don’t have those (thanks EMC…) you’ll have to code them by yourself from the JSON responses (or use something like http://www.jsonschema2pojo.org/ to autogenerate them).

Once you have those (and the Gson libraries in your project) it is quite straightforward:

Reading a JSON response as an object:

DefaultHttpClient httpClient = new DefaultHttpClient();  
      
//documentum user and password  
String authorizationString = "Basic " + Base64.encodeToString((strUser + ":" + strPass).getBytes(), Base64.NO_WRAP);  
      
//request the page, here we get the main repository page  
HttpGet getRequest = new HttpGet(currentServer +"/repositories");  
//don't forget the credentials  
getRequest.setHeader("Authorization", authorizationString);  
//get the response  
HttpResponse getResponse = httpClient.execute(getRequest);  
HttpEntity getResponseEntity = getResponse.getEntity();  
Reader reader = new InputStreamReader(getResponseEntity.getContent());  
      
//use gson to get the object  
Gson gson=new Gson();  
RepositoryList repoList = (RepositoryList)gson.fromJson(reader, RepositoryList.class);  

Modify some property by sending a POST request:

DefaultHttpClient httpClient = new DefaultHttpClient();  
  
//documentum user and password  
String authorizationString = "Basic " + Base64.encodeToString((strUser + ":" + strPass).getBytes(), Base64.NO_WRAP);  
  
//setting up the POST request  
HttpPost postRequest = new HttpPost(currentServer+"/repositories/"+currentRepo+"/objects/"+strId);  
//don't forget the credentials  
postRequest.setHeader("Authorization",authorizationString);  
  
//Create the object with the property you want to modify  
RepositoryObject ro=new RepositoryObject();  
Attribute props=new Attribute();  
  
props.setSubject("new Subject");  
ro.setProperties(props);  
  
//set the header to the POST request  
postRequest.setHeader("Content-Type", "application/vnd.emc.documentum+json; charset=utf-8");  
//convert the object to json using gson  
Gson gson=new Gson();  
postRequest.setEntity(new StringEntity(gson.toJson(ro)));  
  
//do the POST  
HttpResponse postResponse = httpClient.execute(postRequest);

Note: As you can see, I’m not using service discovery although that would be the right way to do it, however, this was faster and it works as a how-to