Effective Strategies for Catching JavaScript Errors with Selenium's Java WebDriver

Attempting to utilize Java Selenium WebDriver to capture all JavaScript errors on a webpage.

Below is a snippet of the code I am using:

import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.firefox.FirefoxOptions;
import org.openqa.selenium.logging.LogEntries;
import org.openqa.selenium.logging.LogType;

public class MainExample {
    public static void main(String[] args) {
        System.setProperty("webdriver.gecko.driver", "path_to_driver/geckodriver");
        FirefoxOptions options = new FirefoxOptions();
        WebDriver driver = new FirefoxDriver(options);
        driver.get("https://www.google.com");
        LogEntries entries = driver.manage().logs().get(LogType.BROWSER);
    }
}

Utilizing geckodriver version 0.30.0-linux64.tar.gz for the Firefox driver.

Here's my Selenium version:

<dependency>
    <groupId>org.seleniumhq.selenium</groupId>
    <artifactId>selenium-java</artifactId>
    <version>4.1.1</version>
</dependency>

Encountering an exception when running the code above:

Driver info: driver.version: RemoteWebDriver at org.openqa.selenium.json.JsonInput.peek(JsonInput.java:122) at org.openqa.selenium.json.JsonTypeCoercer.lambda$null$6(JsonTypeCoercer.java:140) at org.openqa.selenium.json.JsonTypeCoercer.coerce(JsonTypeCoercer.java:126) at org.openqa.selenium.json.Json.toType(Json.java:69) at org.openqa.selenium.json.Json.toType(Json.java:55) at org.openqa.selenium.json.Json.toType(Json.java:50) at org.openqa.selenium.remote.http.W3CHttpResponseCodec.decode(W3CHttpResponseCodec.java:87) at org.openqa.selenium.remote.http.W3CHttpResponseCodec.decode(W3CHttpResponseCodec.java:49) at org.openqa.selenium.remote.HttpCommandExecutor.execute(HttpCommandExecutor.java:158) at org.openqa.selenium.remote.service.DriverCommandExecutor.execute(DriverCommandExecutor.java:83) at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:552) at org.openqa.selenium.remote.RemoteExecuteMethod.execute(RemoteExecuteMethod.java:35) at org.openqa.selenium.remote.RemoteLogs.getRemoteEntries(RemoteLogs.java:81) at org.openqa.selenium.remote.RemoteLogs.get(RemoteLogs.java:77) at MainExample.main(MainExample.java:17)

JavaScript errors are visible in the logs while running the code on a custom page with Java script errors, but cannot retrieve them using:

driver.manage().logs().get(LogType.BROWSER);

Attempted various solutions from this related subject, but consistently encountering the same error.

Tried downgrading Selenium version to 3.141.59, however still facing the issue.

javascriptjavaseleniumselenium-webdriver

Answer №1

WebDriver Logging Endpoints (Not Yet Supported)

The W3C WebDriver does not currently have a get-logs endpoint defined.

https://www.w3.org/TR/webdriver/#endpoints

Additionally, this issue is still unresolved:

https://github.com/w3c/webdriver/issues/406

Unfortunately, the method driver.manage().logs() is not supported in Firefox.

A statement from the geckodriver team:

As this feature is not currently part of the W3C specification, support for it has been postponed until further clarity on behavior is provided. However, your request has been acknowledged.

References to related issues are as follows:

Using DevTools (Working Solution)

I successfully retrieved console output using selenium-4.1.1 and devtools.v85

package org.example.getlogs

import org.openqa.selenium.WebDriver
import org.openqa.selenium.devtools.DevTools
import org.openqa.selenium.devtools.v85.log.Log
import org.openqa.selenium.firefox.FirefoxDriver
import org.openqa.selenium.firefox.FirefoxOptions

class GetLogsTest {

    public static void main(String[] args) {
        FirefoxOptions options = new FirefoxOptions();
        WebDriver driver = new FirefoxDriver(options);
        DevTools devTools = driver.getDevTools();
        devTools.createSession();
        devTools.send(Log.enable());
        devTools.addListener(Log.entryAdded(),
                logEntry -> {
                    System.out.println("" + logEntry.getLevel()+ ": " + logEntry.getText());
                });
        driver.get("https://stackoverflow.com/questions/70787924/how-to-capture-java-script-errors-using-selenium-java-webdriver");
        driver.quit();
    }
}

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