Here is the snippet to connect to UCM from java

// create the IDC Client Manager manager
IdcClientManager manager = new IdcClientManager();

// build a client that will communicate using the HTTP protocol
IdcClient idcClient;

try {
//context with ucm username and password
IdcContext user = new IdcContext ("webadmin", "passw0rd");
//ucm link
idcClient = manager.createClient("idc://ucmwebcenterqa01.group.com:4444");

// get the binder
DataBinder binder = idcClient.createBinder();

// populate the binder with the parameters
binder.putLocal ("IdcService", "GET_FILE");
binder.putLocal("dDocName", "UCM_CLUSTER1001204");
binder.putLocal("RevisionSelectionMethod", "Latest");

try {
ServiceResponse response = idcClient.sendRequest (user, binder);

// get the response as a string
String responseString = response.getResponseAsString ();
//dispaly the content of the file
System.out.println ("" + responseString);

} catch (IdcClientException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
} catch (IdcClientException e) {
e.printStackTrace();
}
}