不存在类型变量 V 的实例，因此 ExpectedCondition<Boolean> 符合功能<? super WebDriver, V>

Question

This compile-time error is thrown:

No instance(s) of type variable(s) V exist so that ExpectedCondition<Boolean> 
conforms to Function<? super WebDriver, V>

For this code:

ExpectedCondition<Boolean> expectation = new
    ExpectedCondition<Boolean>() {
        public Boolean apply(WebDriver driver) {
            return ((JavascriptExecutor) driver).executeScript("return window.value").(true);
        }
    };
new WebDriverWait(driver, timeout)
    .until(expectation);

Whereas, the ExpectedCondition conform to conforms to Function<? super WebDriver, V> conforms to Function<? super WebDriver, V>

I'm baffled by the error, any ideas what could be wrong here?

Answer 1

The issue was there is a Guava version 18.0 in the dependency, then changing it back to version 22.0 solved the problem:

    <dependency>
        <groupId>com.google.guava</groupId>
        <artifactId>guava</artifactId>
        <version>22.0</version>
    </dependency>

Answer 2

也许您可以将依赖项（selenium-java）先放在依赖项中，然后再重新加载 maven