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ReportNG does not capture Selenium screenshots for you. To attach one to a failed test, capture it in a TestNG listener while the WebDriver is still available, copy Selenium’s temporary image file into a durable location beside the report, and log a link whose relative path resolves from the generated ReportNG page. Then verify the link in the actual report: listener timing, HTML escaping and report relocation can all affect whether it works.
How the screenshot-to-report workflow works
Treat this as two connected jobs: capture and preserve the image, then expose it in the test’s report output. Selenium provides the capture API; TestNG supplies lifecycle callbacks and logging; ReportNG displays TestNG reporter output. The project assembles the link between them. ReportNG documentation describes reporter configuration, not native screenshot capture.
- Configure ReportNG and register it with the project’s TestNG run.
- In a failure callback, get the WebDriver instance associated with the failing test and capture a screenshot.
- Copy the returned temporary file into a stable directory that will travel with the report.
- Log a report-relative link and inspect the generated HTML to confirm that it renders and opens the image.
The Selenium Java API describes TakesScreenshot as an interface for a driver or HTML element that can capture a screenshot and store it in different ways. This guide uses the WebDriver form. A separate option is to capture a particular element through an element that supports the interface.
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Configure ReportNG and TestNG
Use the setup instructions for the project’s actual build system and dependency versions. The TestNG-hosted ReportNG documentation covers Maven configuration, service-provider wiring for its HTML and JUnit XML reporters, and Ant listener configuration. It directs command-line, IDE and other build-system users to register custom listeners or reporters through TestNG. Follow the configuration for your environment rather than copying a build snippet that may not match your dependency tree.
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The TestNG-hosted page labels ReportNG 1.2.2 as its current stable version and says it was tested with TestNG 6.14.3. That is a documented tested combination, not a guarantee of compatibility with every later TestNG or Selenium release. A legacy ReportNG site describes 1.1.4 and TestNG 6.2; prefer the TestNG-hosted documentation and validate the versions actually resolved by your build.
TestNG distinguishes real-time lifecycle callbacks in ITestListener from IReporter, which runs after suites complete. A failure callback is useful for screenshots because it can run before teardown closes the browser—but only if your driver lifecycle leaves that test’s driver available at that point. See TestNG and its logging and results documentation.
Capture and copy the failure screenshot
Call getScreenshotAs(OutputType.FILE) on the failing test’s driver. The OutputType API also documents Base64 and byte-array output forms. The file form is convenient for copying, but Selenium documents it as temporary and deleted when the JVM exits. Do not put its temporary path in a report and expect the image to remain available; copy it to the report’s artifact directory first. Selenium’s documentation example also demonstrates Java screenshot capture and copying.
The following listener shows the integration shape using Java NIO. Replace DriverManager.getDriver() with the project’s own driver lookup, and register the listener using the project’s TestNG configuration. This is an illustrative implementation, not a claim that it has been built against your dependency versions. The output directory and report-relative link must be adjusted to the location of the generated HTML page.
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import java.io.File;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
import org.openqa.selenium.OutputType;
import org.openqa.selenium.TakesScreenshot;
import org.openqa.selenium.WebDriver;
import org.testng.ITestListener;
import org.testng.ITestResult;
import org.testng.Reporter;
public class ScreenshotListener implements ITestListener {
@Override
public void onTestFailure(ITestResult result) {
WebDriver driver = DriverManager.getDriver(); // Replace with your driver lookup.
if (driver == null || !(driver instanceof TakesScreenshot)) {
Reporter.log("Failure screenshot unavailable: no screenshot-capable driver.");
return;
}
try {
Path directory = Paths.get("test-output", "screenshots");
Files.createDirectories(directory);
String name = safeName(result) + "-" + System.nanoTime() + ".png";
File temporary = ((TakesScreenshot) driver)
.getScreenshotAs(OutputType.FILE);
Path destination = directory.resolve(name);
Files.copy(temporary.toPath(), destination,
StandardCopyOption.REPLACE_EXISTING);
// This path assumes the ReportNG HTML page is in test-output/html.
String reportRelativePath = "../screenshots/" + name;
Reporter.log("Failure screenshot: <a href="" + reportRelativePath
+ "">Open image</a>");
} catch (Exception e) {
Reporter.log("Failure screenshot could not be saved: "
+ e.getClass().getSimpleName());
}
}
private static String safeName(ITestResult result) {
String value = result.getTestClass().getRealClass().getSimpleName()
+ "-" + result.getMethod().getMethodName()
+ "-" + result.getStartMillis();
return value.replaceAll("[^A-Za-z0-9._-]", "_");
}
}In the example, the logged anchor is HTML-escaped as < and > in the Java string, so it will display as literal markup if the report treats it as text. If the generated ReportNG page supports rendered HTML log content, use the markup form appropriate to that version and configuration, then verify the result; do not assume that escaping behavior. The ReportNG page warns that disabling escaping is not recommended because raw log text can become HTML or XML. Keep escaping enabled unless there is a carefully reviewed reason not to, and do not put untrusted test data into raw markup.
The safeName method combines class, method and start time, strips characters unsafe for a simple filename, and adds a nanosecond suffix to reduce collisions. For a parallel or data-driven suite, use a naming scheme that uniquely identifies each invocation; method name alone is not enough. If your project already assigns a unique test or invocation ID, use it instead of relying on a timestamp. Avoid placing credentials, customer data or other sensitive values in a filename or logged link.
Make the link survive report generation and archiving
A link that works from one HTML file may fail from another. The example assumes a report page under test-output/html and images under test-output/screenshots; the relative URL is therefore ../screenshots/.... Your ReportNG output may use a different layout. Open the generated page, inspect the link’s resolved URL, and click it after copying or extracting the complete report directory to a different location.
- Create the image directory before copying; the code does this with
Files.createDirectories. - Archive or publish the screenshots directory along with the report HTML. A link is not an attachment if the image file is omitted.
- Use a unique filename for every parallel or repeated test invocation to prevent overwriting another failure’s capture.
- Test the renderer’s escaping behavior with a generated report. A link printed literally is not a clickable link.
- Handle capture or copy errors without masking the original test failure. The listener above logs a short failure message instead of throwing from the callback.
TestNG’s ReportNG sample output identifies displayed log output as a combination of calls to TestNG Reporter methods. Use Reporter.log(...) to add test-associated output, but confirm the markup and relative URL behavior in the report produced by your own ReportNG version.
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Choose capture timing and output format deliberately
Capture in the failure callback
Use ITestListener.onTestFailure when the browser should still show the state at failure time. This only works if teardown has not already quit the driver and the listener can retrieve the correct instance. If driver cleanup runs earlier, change the lifecycle ordering or capture before cleanup. Do not defer capture to an after-suite reporter and assume a live browser will still exist.
Use Base64 or bytes only when the storage path calls for it
OutputType.FILE is a straightforward choice when the report links to a separate image file. Base64 or byte output can be useful when another component needs to handle the image data directly, but it does not by itself make the image durable or attach it to ReportNG. The report still needs a usable representation or link and a reliable way to serve the image.
Keep report-relative artifacts portable
A relative link avoids binding the report to one machine’s absolute filesystem path, but only if the report and screenshot retain their relative layout when published. If a CI system stores HTML and images as separate artifacts, make sure the link points to the location in the published artifact, not only to a local build directory.
Troubleshooting
The callback reports a null driver or throws after teardown
The driver may be stored in a thread-local or test-context object that the listener cannot access, or teardown may have quit it already. Make the driver lookup use the same test context as the test itself and ensure capture runs before that context is cleared. In parallel runs, never use a shared mutable driver field that can return another test’s browser.
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The link appears as literal HTML
ReportNG or TestNG may be escaping log output, so the browser displays the anchor characters instead of rendering a link. Check the generated HTML and the escaping-related Reporter properties documented by ReportNG. Do not turn off escaping casually: ReportNG cautions that unescaped log content becomes HTML/XML. If rendered links are not appropriate for your configuration, log a plain path or use a reviewed custom report/template approach.
The link opens a missing file
Check that the screenshot was copied successfully, then compute the URL from the directory containing the specific ReportNG HTML page—not from the project root. Confirm the screenshot directory was included when the report was moved, archived or uploaded. A relative path can be valid in a local workspace and invalid in a published artifact with a different layout.
One test’s screenshot replaces another’s
Parallel tests or data-provider invocations may share a filename if it is based only on the method name. Include a unique invocation identifier or timestamp and sanitize it for filesystem use. Ensure each callback gets the WebDriver belonging to its own test execution.
No screenshot file is produced
Check that the driver implements TakesScreenshot, that the browser session remains active at callback time, and that the test process can write to the destination. Log capture failures without replacing the original test result, then inspect the listener output and filesystem permissions.
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The report stops working after a dependency upgrade
Inspect the resolved Maven or other build dependency tree, confirm ReportNG registration, and create a clean report build. The ReportNG documentation’s stated tested combination is not blanket compatibility assurance for later TestNG versions; verify listener execution, report generation, escaping and artifact paths after version changes.
Or skip the browser setup
For a screenshot of a public page by URL—not the live browser state, cookies or authenticated session of a Selenium test—ScreenshotNeo offers a one-request website screenshot API. It does not replace the listener workflow above or automatically attach an image to ReportNG.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpSee the ScreenshotNeo API documentation for request options. ScreenshotNeo accepts cookie and consent banners like a visitor and removes more than 60 known consent platforms, newsletter popups and chat widgets before capture; each step can be turned off. Bot checks, blank pages, timeouts, failed loads and cache hits are not billed, and responses identify the page verdict and billing status in headers. Its MCP server exposes screenshot tools for AI agents. The Free plan includes 1,000 screenshots per month without a card; paid plans start at $5 for 3,000 shots. It is made by Yorker Media. Learn about ScreenshotNeo or sign up free for 1,000 screenshots a month, with no card.
Validate the finished integration
- Run a deliberately failing test in a non-production test environment and confirm the listener executes before the driver closes.
- Check that a screenshot file appears in the intended artifact directory and can be opened.
- Open the generated ReportNG HTML and verify whether the log appears as a clickable link or escaped text.
- Move or extract the complete report artifact elsewhere and open the link again.
- Repeat with parallel or data-driven tests to confirm each failure gets a distinct image and the correct driver state.
Frequently Asked Questions
Can ReportNG capture a screenshot by itself?
No. The screenshot is captured through Selenium and the project connects it to ReportNG output through TestNG logging or a custom reporting approach.
Should I use TestNG IReporter instead of ITestListener?
Use ITestListener when capture needs to happen during a failure while the browser may still be open. IReporter runs after suites complete and is not a substitute for capturing a live browser before teardown.
Can ScreenshotNeo attach a Selenium failure screenshot to ReportNG?
Not by itself. It captures a website from a URL through its API; it does not access a Selenium session or wire an image into a ReportNG report.
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