Selenium 4 – Chrome DevTools Log Entry Listeners

In Selenium 4, you can listen Chrome Console logs using “Devtools” interface. Let’s see with an example.

admin Posted on 30/04/2019

Selenium-4-Chrome-DevTools-Log-Entry-Listeners

Sometimes, logs from Chrome are useful to understand application’s issues. However, when the Selenium is being executed, we can’t capture and verify Chrome logs.

In Selenium 4, you can listen Chrome Console logs using “Devtools” interface. In this blog, you will learn how to listen Chrome console logs using Selenium 4.0 (Alpha).

Selenium 4.0 (Alpha) Maven Dependency

<dependency>
<groupId>org.seleniumhq.selenium</groupId>
<artifactId>selenium-java</artifactId>
<version>4.0.0-alpha-1</version>
</dependency>

Sample Code

DevTools devTools = ((ChromeDriver)driver).getDevTools();

devTools.createSession();
devTools.send(Log.enable());

devTools.addListener(Log.entryAdded(), entry -> System.out.println(entry.asSeleniumLogEntry()));

Using the above code, Chrome DevTools Console logs can be published in Log4j or LogBack files.

Full Code

import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.devtools.DevTools;
import org.openqa.selenium.devtools.Log;
import org.slf4j.*;

public class Selenium4Devtools {
    final static Logger logger = LoggerFactory.getLogger(Selenium4Devtools.class);

    public static void main(String args[]){

        System.setProperty("webdriver.chrome.driver", "drivers/chromedriver.exe");
        WebDriver driver = new ChromeDriver();

        try{

            DevTools devTools = ((ChromeDriver)driver).getDevTools();

            devTools.createSession();
            devTools.send(Log.enable());

            devTools.addListener(Log.entryAdded(), entry -> logger.error(entry.asSeleniumLogEntry().getMessage()));

            driver.get("http://www.codoid.com");

        }
        catch(Exception e){
            e.printStackTrace();
        }
        finally {
            driver.quit();
        }
    }
}