Sample Webdriver Java example with custom-data / rest call public job: https://saucelabs.com/tests/bfb53744b3474162bf3cf3f6f4b1cb8d

WebdriverSample.java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import org.apache.commons.codec.binary.Base64;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.remote.RemoteWebDriver;
import org.openqa.selenium.support.ui.ExpectedCondition;
import org.openqa.selenium.support.ui.Wait;
import org.openqa.selenium.support.ui.WebDriverWait;
import org.openqa.selenium.remote.DesiredCapabilities;

public class WebdriverSample {

    public WebDriver driver;
    public Wait<WebDriver> wait;
    public static String username = "SAUCE-USERNAME";
    public static String key = "SAUCE-KEY";
    public String jobId;
    
    public void setUp() throws MalformedURLException{
    	

    	DesiredCapabilities caps = DesiredCapabilities.firefox();
    	caps.setCapability("name", "Java ♥");
		caps.setCapability("platform", "Linux");
		caps.setCapability("version", "21");
		
		this.driver = new RemoteWebDriver(
			new URL("http://" + username + ":" + key + "@ondemand.saucelabs.com:80/wd/hub"),
			caps);
		this.wait = new WebDriverWait(driver, 30);
		this.jobId = ((RemoteWebDriver) this.driver).getSessionId().toString();
    }


    public static void main(String[] args) throws MalformedURLException {
    	WebdriverSample sample = new WebdriverSample();
    	sample.setUp();
        sample.driver.get("http://www.google.com/");

        boolean result;
        try {
            result = sample.firstPageContainsSauce();
        } catch(Exception e) {
            e.printStackTrace();
            result = false;
        } finally {
        	sample.driver.quit();
        }

        System.out.println("Test " + (result? "passed." : "failed."));
    	sample.updateJobData(result);
        if (!result) {
            System.exit(1);
        }
    }

    public boolean firstPageContainsSauce() {
        //type search query
    	this.driver.findElement(By.name("q")).sendKeys("sauce labs\n");
        // click search
    	this.driver.findElement(By.name("btnG")).click();
        // Wait for search to complete
        this.wait.until(new ExpectedCondition<Boolean>() {
            public Boolean apply(WebDriver webDriver) {
                System.out.println("Searching ...");
                return webDriver.findElement(By.id("resultStats")) != null;
            }
        });
        // Look for saucelabs.com in the results
        return driver.findElement(By.tagName("body")).getText().contains("saucelabs.com");
    }
    
    public void updateJobData(boolean result) {
    	try {
    		URL url = new URL("http://saucelabs.com/rest/v1/" + username + "/jobs/" + this.jobId);
    		HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    		conn.setDoOutput(true);
    		conn.setRequestMethod("PUT");
    		conn.setRequestProperty("Content-Type", "application/json");

    		byte[] authEncBytes = Base64.encodeBase64((username + ":" + key).getBytes());
    		conn.setRequestProperty("Authorization", "Basic " + new String(authEncBytes));
     
    		String input = "{\"passed\":" + result +
    				", \"custom-data\": {\"java-test\": {\"failed\": 0, \"total\": 5, \"passed\": 5, \"runtime\": 20}}}";
     
    		OutputStream os = conn.getOutputStream();
    		os.write(input.getBytes());
    		os.flush();
     
    		if (conn.getResponseCode() != HttpURLConnection.HTTP_OK) {
    			throw new RuntimeException("Failed : HTTP error code : "
    				+ conn.getResponseCode());
    		}
    		BufferedReader br = new BufferedReader(new InputStreamReader(
    				(conn.getInputStream())));
    		String output;
    		System.out.println("Output from Server .... \n");
    		while ((output = br.readLine()) != null) {
    			System.out.println(output);
    		}
    		conn.disconnect();
    	  } catch (MalformedURLException e) {
    		e.printStackTrace();
    	  } catch (IOException e) {
    		e.printStackTrace();
    	 }
    }
    
}