FluentTest not able to instantiate WebDriver instance, problem with (absence of) Capabilities

[jlannoy]

Trying to reuse old tests with the last version of FluentLenium, we encountered a blocking error.

org.openqa.selenium.WebDriverException: Browser failed to start, test [ ... ] execution interrupted.
Caused by: [ Index 0 out of bounds for length 0]
Build info: version: '4.9.0', revision: 'd7057100a6'
System info: os.name: 'Mac OS X', os.arch: 'aarch64', os.version: '13.4.1', java.version: '19.0.2'
Driver info: driver.version: unknown

Further :

Caused by: java.lang.ArrayIndexOutOfBoundsException: Index 0 out of bounds for length 0
	at io.fluentlenium.configuration.DefaultWebDriverFactories$ChromeWebDriverFactory.newInstance(DefaultWebDriverFactories.java:64)

Looking deeply at what happens, it comes from the DefaultWebDriverFactories.

    /**
     * Chrome WebDriver factory.
     */
    @FactoryPriority(64)
    @DefaultFactory
    public static class ChromeWebDriverFactory extends ReflectiveWebDriverFactory {

        /**
         * Creates a new chrome WebDriver factory.
         */
        public ChromeWebDriverFactory() {
            super("chrome", "org.openqa.selenium.chrome.ChromeDriver");
        }

        @Override
        protected WebDriver newInstance(Class<? extends WebDriver> webDriverClass, ConfigurationProperties configuration, Object... args) throws InvocationTargetException, NoSuchMethodException, InstantiationException, IllegalAccessException {

            Capabilities oCaps = (Capabilities) args[0];
            ChromeOptions chromeOptions = new ChromeOptions();
            chromeOptions = chromeOptions.merge(oCaps);

            return super.newInstance(webDriverClass, configuration, chromeOptions);
        }
    }

The (Capabilities) args[0]; fails because when we are using default FluentTest configuration, the newInstance function is called from ReflectiveWebDriverFactory with a null array of args, that array being the third constructor parameter from the driver factory...

            DesiredCapabilities defaultCapabilities = newDefaultCapabilities();
            if (defaultCapabilities != null) {
                defaultCapabilities.merge(capabilities);
                capabilities = defaultCapabilities;
            }

            if (capabilities != null && !capabilities.asMap().isEmpty()) {
                ArrayList<Object> argsList = new ArrayList<>(Arrays.asList(args));
                argsList.add(0, capabilities);
                try {
                    return newInstance(webDriverClass, configuration, argsList.toArray());
                } catch (NoSuchMethodException e) { // NOPMD EmptyCatchBlock
                    // Ignore capabilities.
                }
            }
            return newInstance(webDriverClass, configuration, args);

The args on the last line here is a local attribute of a WebDriver factory, which are taken form the third+ arguments of the factory constructor. super("chrome", "org.openqa.selenium.chrome.ChromeDriver");... Which doesn't exist, leading in an empty array.

How to reproduce?

The Basic FluentLenium test on the quickstart page will simply fail the same way, in a new empty project.

Current fix

To fix our tests, we override a method to have default (unused) capabilities and skip the line looking at the empty array :

   @Override
    public Capabilities getCapabilities() {
        return new MutableCapabilities(Map.of("cloud:options", Map.of("name", this.getClass().getSimpleName())));
    }

I don't know if the WebDriverFactories should simply pay attention to the fact that the args array can be empty. I would assume something as change in a recent version of FluentLenium.

[jlannoy]

Thank you for reporting the issue, and your current fix ; I came here looking for the same one...