How to do logging integration with logback and testng in report portal

Image Attribution: Report portal logo, logback logo, Gradle logo — wikipedia

Hi there, friend 👋,

Report portal is a quite unique open-source reporting solution available and seamlessly integrates with the test runner of youR choice

I’ve been using Report portal in my current company and have quite recently started looking into its features in more detail.

If you new to Report portal and want to get started with setting up a basic instance on docker and play around then you might find my earlier post on this topic useful

Check out: How to setup ReportPortal on a local docker instance

Once you have setup Report portal, and have started pushing some test runs into it, you would want to get more detail about the test execution. While report portal will display the stack trace for a failed assertion, it won’t really give you all the console logs of the sequence of action that happened above

As a simple example, let’s say an API request fails wit a 500 and you have written an assertion on the response code, while Report portal will let you know about the mismatch, it won’t give you the API request ,etc even though that might have been printed into the console with a TestNG Reporter.log() message

So how do we push logs into Report portal? Let’s see how to set this up.

Setup logging using logback

On a high level, we need to do 4 steps

  1. Add desired logger dependency into gradle
  2. Add listener in your tests job in gradle
  3. Add .xml properties file with the ReportPortalAppender specified
  4. Add the class level logger and then write some messages to it.

Add Maven/Gradle dependencies

Add below dependencies in your build.gradle file

compile group: 'com.epam.reportportal', name: 'agent-java-testng', version: '5.0.7'
compile group: 'com.epam.reportportal', name: 'logger-java-logback', version: '5.0.3'
compile group: 'ch.qos.logback', name: 'logback-core', version: '1.2.3'
compile group: 'org.slf4j', name: 'slf4j-api', version: '1.7.30'
testCompile group: 'ch.qos.logback', name: 'logback-classic', version: '1.2.3'

Add Report portal listener to you tests job

task runTests(type: Test) {
useTestNG {
testLogging.showSt)ndardStreams = true
useDefaultListeners = false
listeners << 'com.epam.reportportal.testng.ReportPortalTestNGListener'
listeners << 'listeners.ExtentReporterNG'
includeGroups System.getProperty('tag', 'NONE')

Add a logging configuration file

Logback basically has different destinations that it could write logs to called appenders

Here is how a sample configuration file would look like:

This has 3 appenders defined

  • STDOUT which uses ConsoleAppender from logback to write any logs to the command line
  • (Optional) FILE which uses RollingFileAppender from logback to write logs to a physical file and then rotates these in a daily basis so that every new day, you would get a new log file while also keeping a history of max 30 days
  • ReportPortalAppender which pushes logs to the Report portal

To understand how logback works in detail, refer to this excellent guide on Baeldung

Add some loggers

@Test(groups = [TestGroups.ALL])
class LogbackTests {
private val logger: Logger = LoggerFactory.getLogger(

// This test can be flaky and non deterministic
// Done on purpose to see variation in report portal history
fun simpleLoggingTest() {"Example log from ${}")
val random = ThreadLocalRandom.current().nextInt(30000)
val limit = 20000

logMessage(random, limit)
Assert.assertTrue(random > limit, "No was greater than $limit")

private fun logMessage(random: Int, limit: Int) {
if (random > limit) {"$random is > $limit")
} else {"$random is < $limit")

Basically we want to add static final logger as a class member

private val logger: Logger = LoggerFactory.getLogger(

And then use any of the available methods to log at different log levels

Below are the available log levels that you can use

fun differentLogLevelsTest() {
logger.trace("OMG trace level detail")
logger.debug("Minute level detail")"This is just an info")
logger.warn("Something bad happened")
logger.error("Something catastropic happened")

Once you run this test you would see logs show up in report portal under the log message section, you can also filter between the level of detail that you need for your logs using the slider control given


If you found this post useful, Do share it with a friend or colleague. Until next time. Happy Testing/Coding ☮️


Originally published at on September 25, 2020.

Lead SDET at Gojek, Bengaluru, I ❤️ to code in Kotlin, Python 🐍, and Java to build scalable test automation frameworks. Blog at 🇮🇳

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store