GhostDriver在对现有元素执行javascript时引发陈旧异常“Cache中元素不存在”

Question

by = getBy_A001();  
List<WebElement> welCollecN1 = myLibWorks.findElements(driver, timeOutInSeconds, pollingForSecond, by);  
if (welCollecN1 != null) {  
    WebElement wel01 = welCollecN1.iterator().next();  
    if(wel01 != null)  
    {  
        by = getBy_A002();  
        List<WebElement> welCollecN2 = myLibWorks.findElements(wel01, timeOutInSeconds, pollingForSecond, by);  
        if (welCollecN2 != null) {  
            WebElement wel02 = welCollecN2.iterator().next();  
            if(wel02 != null)  
            {  
                String value = null;  
                value = elm.getText();  
                if(value.length() == 0) {  
                    //-------------------------------------------------  
                    // REACH here then i think its ok above, this works almost of time too  
                    // THIS line throws "Element does not exist in cache"  
                    value = (String) ((JavascriptExecutor) driver).executeScript(driver, "return arguments[0].innerHTML", wel02);   // <<== ERROR  
                    //-------------------------------------------------  
                }  
            }  
        }  
    }  
}  

/**  
 * Retrieves an element from the cache. Will verify that the element is
 * still attached to the DOM before returning.
 * @param {string} key The element's key in the cache.
 * @param {Document=} opt_doc The document whose cache to retrieve the element
 *     from. Defaults to the current document.
 * @return {Element|Window} The cached element.
 */
bot.inject.cache.getElement = function(key, opt_doc) {
  key = decodeURIComponent(key);
  var doc = opt_doc || document;
  var cache = bot.inject.cache.getCache_(doc);
  if (!goog.object.containsKey(cache, key)) {
    // Throw STALE_ELEMENT_REFERENCE instead of NO_SUCH_ELEMENT since the
    // key may have been defined by a prior document's cache.
    throw new bot.Error(bot.ErrorCode.STALE_ELEMENT_REFERENCE,
        'Element does not exist in cache');
  }

  var el = cache[key];

  // If this is a Window check if it's closed
  if (goog.object.containsKey(el, 'setInterval')) {
    if (el.closed) {
      delete cache[key];
      throw new bot.Error(bot.ErrorCode.NO_SUCH_WINDOW,
          'Window has been closed.');
    }
    return el;
  }

  // Make sure the element is still attached to the DOM before returning.
  var node = el;
  while (node) {
    if (node == doc.documentElement) {
      return el;
    }
    node = node.parentNode;
  }
  delete cache[key];
  throw new bot.Error(bot.ErrorCode.STALE_ELEMENT_REFERENCE,
      'Element is no longer attached to the DOM');
};

Answer 1

在包含GhostDriver依赖项和运行Chrome Driver测试时，我也遇到了同样的问题。将这两个附加依赖项添加到pom.xml中解决了这个问题：

```

<dependency>
        <groupId>org.seleniumhq.selenium</groupId>
        <artifactId>selenium-remote-driver</artifactId>
        <version>2.53.0</version>
    </dependency>
    <dependency>
        <groupId>org.seleniumhq.selenium</groupId>
        <artifactId>selenium-server</artifactId>
        <version>2.53.0</version>
    </dependency>

```