Answer Posted / suresh vemula

First we have to create a method of screen shot using java.

After that we have annotation in testng to identify the failure test case or methods using "iTestResult"

This iTestResult using only where annotation in aftermethod

@Aftermethod
Public void test(iTestResult.FAILURE==result.getStatus()){

Utility.screenshot(driver,result.getname());
}

Here utility.screenshot is java class to created for screenshot

Here getName() returns the failure test case name
Then you have to identify the failure test easily

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