How to configure Extent Reports for Appium Parallel execution? Am getting null pointer exception !

Implementing Appium grid when am performing parallel execution the application and catching null pointer exception

Summary

Expected Behavior

Current Behavior

It was working perfectly when I was working to execute single test case but when am doing the same for parallel it's throwing me null pointer exception

Sample

// Sample code goes here

public class AppiumTestBase {

public static final Logger log = Logger.getLogger(AppiumTestBase.class.getName());
static AppiumDriverLocalService services;
public static AndroidDriver<MobileElement> driver;
public static String destDir;
public static String srcPath;

Capablities caP;
static AppiumServer aS;

public static ExtentReports extent;
public static ExtentTest test;
public ITestResult result;
public static String newFileName;
public ExtentReports reo =ExtentManager.getInstance();
public static ExtentTest tst;

static {
Calendar calendar = Calendar.getInstance();
SimpleDateFormat formater = new SimpleDateFormat("dd_MM_yyyy_hh_mm_ss");
extent = new ExtentReports(System.getProperty("user.dir") + "\target\surefire-reports\html\"+ formater.format(calendar.getTime()) + ".html", false);

	extent.loadConfig(new File(System.getProperty("user.dir") + Configration.ReportsConfig));
}

public String captureScreen(String fileName) {
if (fileName == "") {
fileName = "blank";
}
File destFile = null;
Calendar calendar = Calendar.getInstance();
SimpleDateFormat formater = new SimpleDateFormat("dd_MM_yyyy_hh_mm_ss");
File scrFile = ((TakesScreenshot) driver).getScreenshotAs(OutputType.FILE);
try {
String reportDirectory = new File(System.getProperty("user.dir")) + "\target\surefire-reports\html\";

		destFile = new File(
				(String) reportDirectory + fileName + "_" + formater.format(calendar.getTime()) + ".png");
		newFileName = fileName + "_" + formater.format(calendar.getTime()) + ".png";
		FileUtils.copyFile(scrFile, destFile);
		Reporter.log("<a href='" + destFile + "'> <img src='" + "_" + fileName + formater.format(calendar.getTime())
				+ ".png" + "' height='100' width='100'/> </a>");

	}

public void log(String data) {
log.info(data);
Reporter.log(data);
}
public void getresult(ITestResult result) {
if (result.getStatus() == ITestResult.SUCCESS) {
test.log(LogStatus.PASS, result.getName() + "test is pass");
captureScreen("");
test.log(LogStatus.PASS, test.addScreenCapture(newFileName));

	} else if (result.getStatus() == ITestResult.SKIP) {
		test.log(LogStatus.SKIP,
				result.getName() + " test is skipped and skip reason is:-" + result.getThrowable());
		captureScreen("");
		test.log(LogStatus.SKIP, test.addScreenCapture(newFileName));
	} else if (result.getStatus() == ITestResult.FAILURE) {
		test.log(LogStatus.ERROR, result.getName() + " test is failed" + result.getThrowable());
		captureScreen("");
		test.log(LogStatus.FAIL, test.addScreenCapture(newFileName));
	} else if (result.getStatus() == ITestResult.STARTED) {
		test.log(LogStatus.INFO, result.getInstanceName() + "test is started" + result.getThrowable());

	}
}
@Parameters({ "deviceName_","UDID_","platformVersion_" })

// @BeforeMethod()
// public void beforeMethod(Method result) throws MalformedURLException {
//AppiumServer.start();
//driver =Capablities.setAndroidCapablities(driver);

	@BeforeMethod
	public AndroidDriver<MobileElement>  beforeMethod(String deviceName_,String UDID_,String platformVersion_) throws MalformedURLException, InterruptedException {
		
		
		DesiredCapabilities capabilities = new DesiredCapabilities();
		capabilities.setCapability(CapabilityType.BROWSER_NAME, "");
		capabilities.setCapability("deviceName", deviceName_);
		capabilities.setCapability("udid", UDID_);
		capabilities.setCapability("platformVersion", platformVersion_);
		capabilities.setCapability("platformName", "Android");
		
		capabilities.setCapability("appPackage", "com.hitesh_sahu.retailapp");
		capabilities.setCapability("appActivity", "com.hitesh_sahu.retailapp.view.activities.LoginActivity");
		driver = new AndroidDriver<MobileElement>(new URL("http://127.0.0.1:4444/wd/hub"), capabilities);
		driver.manage().timeouts().implicitlyWait(80, TimeUnit.SECONDS);
		

test = extent.startTest(result.getName()); 
test.log(LogStatus.INFO, "open Application");
return driver;

}

@AfterClass(alwaysRun = true)
public void endTest() {
	
	extent.endTest(test);
	extent.flush();
}
 public void reportLog(String message) {    
	 	captureScreen("");
	    test.log(LogStatus.INFO, message+ test.addScreenCapture(newFileName));// at this ponit am getting nullpointer execption 
	    log.info("Message: " + message);
	    Reporter.log(message);

	}
}

This is my test case

public class Test_FireCart_Dashboard_module extends AppiumTestBase{

Dashboard_module dM;
@Test(priority = 1)
public void testMenuFunctionality() throws InterruptedException {
	try {
		dM = new Dashboard_module(driver);
		PageFactory.initElements(new AppiumFieldDecorator(driver), dM);
		reportLog("Verify Fire Cart Application is launched");
		dM.signUp_with_google();
		dM.googleacc();
		reportLog("Verify Sign in with google button is clicked");
		new WebDriverWait(driver, 1000l)
				.until(ExpectedConditions.visibilityOfElementLocated(By.id("com.hitesh_sahu.retailapp:id/header")));
		reportLog("Verify user sucessfully login to Fire Cart dashboard");
		dM.clickOnMenu();
		reportLog("Verify menu button is clicked");
		for(int i =2;i<=6;i++) {
			reportLog("Verify user clicked" + dM.clickMenuItems().get(i).getText());
		dM.clickMenuItems().get(i).click();
		dM.clickOnBack();
		dM.clickOnMenu();
		}
		new WebDriverWait(driver, 1000l)
				.until(ExpectedConditions.visibilityOfElementLocated(By.xpath("//*[@text='Logout']")));
		dM.clickOnLogout();
		reportLog("Verify Logout option is clicked");
	} catch (Exception e) {
		reportLog("Failed to launch Fire cart application");
	}
	try {
		String act_text = HardAssertions.textassertion(dM.validateLoginScreen());
		Assert.assertEquals(act_text, "LOGIN");

	} catch (Exception e) {
		captureScreen("");
		test.log(LogStatus.FAIL, "Filed to logout from Fire cart dashbord", test.addScreenCapture(newFileName));
	}

}

Environment Details

• Extent report Version used: 2.41.2
• Operating System and version: Windows 10 pro
• JDK Version: java version "1.8.0_161"
  

Screenshots

java.lang.NullPointerException