how to connect a Java app ( java code ) to cloudant? - cloudant

Question

I've java code in eclipse and I've done all the set up required between eclipse and IBM bluemix cloudant service
I am not sure how to update my code to enable cloudant in eclipse
can someone please help ?

Answer 1

you need to add a piece of code in CloudantClient.java file under source directory of your project.
Please add these lines in CloudantClient class:
String VCAP_SERVICES = System.getenv("VCAP_SERVICES");
JSONObject vcap;
vcap = (JSONObject) JSONObject.parse(VCAP_SERVICES);
cloudant = (JSONArray) vcap.get("cloudantNoSQULDB");
cloudantInstance = (JSONObject) cloudant.get(0);
cloudantCredentials = (JSONObject) cloudantInstance.get("credentials");
you can also put this piece of code in a try catch loop as well.
try {
String VCAP_SERVICES = System.getenv("VCAP_SERVICES");
JSONObject vcap;
vcap = (JSONObject) JSONObject.parse(VCAP_SERVICES);
cloudant = (JSONArray) vcap.get("cloudantNoSQULDB");
cloudantInstance = (JSONObject) cloudant.get(0);
cloudantCredentials = (JSONObject) cloudantInstance.get("credentials");
}
catch (IOException e) {
e.printStackTrace();
}
I hope it works!

Answer 2

You may use the Bluemix config parser library to automatically parse the VCAP_SERVICES env variable (https://github.com/icha024/bluemix-config-parser)
It simplifies the messy code into...
String username = BluemixConfigStore.getConfig().getCloudantNoSQLDB()
.getCredentials().getUsername();
String password = BluemixConfigStore.getConfig().getCloudantNoSQLDB()
.getCredentials().getPassword();
Then you can create a Cloudant client from it as usual:
CloudantClient cloudantClient = ClientBuilder.account(username)
.username(username)
.password(password)
.build();

Answer 3

You need to use VCAP_SERVICES env variable used in bluemix like below:
private JSONArray cloudant;
private JSONObject cloudantInstance;
private JSONObject cloudantCredentials;
public CloudantClient()
{
this.httpClient = null;
try {
String VCAP_SERVICES = System.getenv("VCAP_SERVICES");
JSONObject vcap;
vcap = (JSONObject) JSONObject.parse(VCAP_SERVICES);
cloudant = (JSONArray) vcap.get("cloudantNoSQLDB");
cloudantInstance = (JSONObject) cloudant.get(0);
cloudantCredentials = (JSONObject) cloudantInstance.get("credentials");
} catch (IOException e) {
e.printStackTrace();
}
this.port = Config.CLOUDANT_PORT;
this.host = (String) cloudantCredentials.get("host");
this.username = (String) cloudantCredentials.get("username");
this.password = (String) cloudantCredentials.get("password");
this.name = Config.CLOUDANT_NAME;
this.dbc = this.createDBConnector();
}