Maven/Java爬虫-StaleElementReferenceException

我收到一个StaleElementReferenceException，但我不知道为什么？爬虫程序工作正常，并在排队的URL中循环，但由于StaleElementReferenceException错误而失败

任何帮助都将不胜感激

下面是代码和错误

代码

package com.crawlerr.pageObjects；
导入java.util.ArrayList；
导入java.util.HashSet；
导入java.util.LinkedList；
导入java.util.List；
导入java.util.Queue；
导入org.openqa.selenium.By；
导入org.openqa.selenium.WebDriver；
导入org.openqa.selenium.WebElement；
导入com.crawler.common.ExcelUtils；
导入com.crawler.common.System_常量；
公共类爬虫器4扩展了基类
{
public static HashSet alreadyListed=new HashSet（）；
public static Queue=new LinkedList（）；
公共爬虫4（WebDriver）{
超级司机；
}
公共静态void Execute（int iTestCaseRow）引发异常{
爬网（ExcelUtils.getCellData（iTestCaseRow，System_Constants.Col_BaseURL），iTestCaseRow）；
//System.out.println（“存储的”+Arrays.toString（alreadyListed.toArray（））；
}
公共静态无效爬网（字符串起始URL，int-iTestCaseRow）
{
添加（起始URL）；
字符串新地址；
而（（newAddress=queue.poll（））！=null）
{
processPage（新地址、起始URL、iTestCaseRow）；
//在这里，您可以添加代码来对页面执行任何操作
}
}
受保护的静态void processPage（字符串url、字符串startingUrl、int-iTestCaseRow）
{
试一试{
System.out.println（“当前URL-”+URL）；
获取（url）；
列表爬网列表=新的ArrayList（）；
爬行列表=FindAllinks（）；
字符串href；
System.out.println（“找到的元素总数”+crawlist.size（））；
对于（int i=0；i

输出：

FAILED: main
org.openqa.selenium.StaleElementReferenceException: Element not found in the cache - perhaps the page has changed since it was looked up
Command duration or timeout: 20.06 seconds
For documentation on this error, please visit: http://seleniumhq.org/exceptions/stale_element_reference.html
Build info: version: '2.48.2', revision: '41bccdd', time: '2015-10-09 19:59:12'
System info: host: 'DESKTOP-PCD960U', ip: '192.168.1.3', os.name: 'Windows 10', os.arch: 'amd64', os.version: '10.0', java.version: '1.8.0_65'
Driver info: org.openqa.selenium.firefox.FirefoxDriver
Capabilities [{applicationCacheEnabled=true, rotatable=false, handlesAlerts=true, databaseEnabled=true, version=42.0, platform=WINDOWS, nativeEvents=false, acceptSslCerts=true, webStorageEnabled=true, locationContextEnabled=true, browserName=firefox, takesScreenshot=true, javascriptEnabled=true, cssSelectorsEnabled=true}]
Session ID: 164b1efc-9098-43b1-ad44-45da58b71f3c
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:206)
    at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:158)
    at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:647)
    at org.openqa.selenium.remote.RemoteWebElement.execute(RemoteWebElement.java:326)
    at org.openqa.selenium.remote.RemoteWebElement.getAttribute(RemoteWebElement.java:149)
    at com.crawlerr.pageObjects.Crawler4.processPage(Crawler4.java:52)
    at com.crawlerr.pageObjects.Crawler4.crawl(Crawler4.java:36)
    at com.crawlerr.pageObjects.Crawler4.Execute(Crawler4.java:25)
    at com.crawler.Tests.Crawler_Test.main(Crawler_Test.java:52)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:85)
    at org.testng.internal.Invoker.invokeMethod(Invoker.java:639)
    at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:821)
    at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1131)
    at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:124)
    at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:108)
    at org.testng.TestRunner.privateRun(TestRunner.java:773)
    at org.testng.TestRunner.run(TestRunner.java:623)
    at org.testng.SuiteRunner.runTest(SuiteRunner.java:357)
    at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:352)
    at org.testng.SuiteRunner.privateRun(SuiteRunner.java:310)
    at org.testng.SuiteRunner.run(SuiteRunner.java:259)
    at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
    at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
    at org.testng.TestNG.runSuitesSequentially(TestNG.java:1185)
    at org.testng.TestNG.runSuitesLocally(TestNG.java:1110)
    at org.testng.TestNG.run(TestNG.java:1018)
    at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:111)
    at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:204)
    at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:175)
Caused by: org.openqa.selenium.StaleElementReferenceException: Element not found in the cache - perhaps the page has changed since it was looked up
For documentation on this error, please visit: http://seleniumhq.org/exceptions/stale_element_reference.html
Build info: version: '2.48.2', revision: '41bccdd', time: '2015-10-09 19:59:12'
System info: host: 'DESKTOP-PCD960U', ip: '192.168.1.3', os.name: 'Windows 10', os.arch: 'amd64', os.version: '10.0', java.version: '1.8.0_65'
Driver info: driver.version: unknown
    at <anonymous class>.fxdriver.cache.getElementAt(resource://fxdriver/modules/web-element-cache.js:9351)
    at <anonymous class>.Utils.getElementAt(file:///C:/Users/Craig/AppData/Local/Temp/anonymous8982667753843323416webdriver-profile/extensions/fxdriver@googlecode.com/components/command-processor.js:8978)
    at <anonymous class>.WebElement.getElementAttribute(file:///C:/Users/Craig/AppData/Local/Temp/anonymous8982667753843323416webdriver-profile/extensions/fxdriver@googlecode.com/components/command-processor.js:12019)
    at <anonymous class>.DelayedCommand.prototype.executeInternal_/h(file:///C:/Users/Craig/AppData/Local/Temp/anonymous8982667753843323416webdriver-profile/extensions/fxdriver@googlecode.com/components/command-processor.js:12534)
    at <anonymous class>.fxdriver.Timer.prototype.setTimeout/<.notify(file:///C:/Users/Craig/AppData/Local/Temp/anonymous8982667753843323416webdriver-profile/extensions/fxdriver@googlecode.com/components/command-processor.js:621)


===============================================
    Default test
    Tests run: 1, Failures: 1, Skips: 0
===============================================


===============================================
Default suite
Total tests run: 1, Failures: 1, Skips: 0
===============================================

失败：主
org.openqa.selenium.StaleElementReferenceException:在缓存中找不到元素-可能页面在查找后已更改
命令持续时间或超时：20.06秒
有关此错误的文档，请访问：http://seleniumhq.org/exceptions/stale_element_reference.html
构建信息：版本：'2.48.2'，修订版：'41bccdd'，时间：'2015-10-09 19:59:12'
系统信息：主机：'DESKTOP-PCD960U'，ip:'192.168.1.3'，os.name:'Windows 10'，os.arch:'amd64'，os.version:'10.0'，java.version:'1.8.0_65'
驱动程序信息：org.openqa.selenium.firefox.FirefoxDriver
功能[{applicationCacheEnabled=true，rotatable=false，handlesAlerts=true，databaseEnabled=true，version=42.0，platform=WINDOWS，nativeEvents=false，acceptSslCerts=true，WebStorage Enabled=true，locationContextEnabled=true，browserName=firefox，takesScreenshot=true，javascriptEnabled=true，CSSSElectorEnabled=true}]
会话ID:164b1efc-9098-43b1-ad44-45da58b71f3c
位于sun.reflect.NativeConstructorAccessorImpl.newInstance0（本机方法）
位于sun.reflect.NativeConstructorAccessorImpl.newInstance（未知源）
位于sun.reflect.delegatingConstructor或AccessorImpl.newInstance（未知源）
位于java.lang.reflect.Constructor.newInstance（未知源）
位于org.openqa.selenium.remote.ErrorHandler.CreateTrowable（ErrorHandler.java:206）
位于org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed（ErrorHandler.java:158）
位于org.openqa.selenium.remote.RemoteWebDriver.execute（RemoteWebDriver.java:647）
位于org.openqa.selenium.remote.RemoteWebElement.execute（RemoteWebElement.java:326）
位于org.openqa.selenium.remote.RemoteWebElement.getAttribute（RemoteWebElement.java:149）
位于com.crawlerr.pageObjects.Crawler4.processPage（Crawler4.java:52）
位于com.crawlerr.pageObjects.Crawler4.crawl（Crawler4.java:36）
位于com.crawlerr.pageObjects.Crawler4.Execute（Crawler4.java:25）
位于com.crawler.Tests.crawler\u Test.main（crawler\u Test.java:52）
在sun.reflect.NativeMethodAccessorImpl.invoke0（本机方法）处
位于sun.reflect.NativeMethodAccessorImpl.invoke（未知源）
在sun.reflect.DelegatingMethodAccessorImpl.invoke处（未知源）
位于java.lang.reflect.Method.invoke（未知源）
位于org.testng.internal.MethodInvocationHelper.invokeMethod（MethodInvocationHelper.java:85）
位于org.testng.internal.Invoker.invokeMethod（Invoker.java:639）
位于org.testng.internal.Invoker.invokeTestMethod（Invoker.java:821）
在org.tes
FAILED: main
org.openqa.selenium.StaleElementReferenceException: Element not found in the cache - perhaps the page has changed since it was looked up
Command duration or timeout: 20.06 seconds
For documentation on this error, please visit: http://seleniumhq.org/exceptions/stale_element_reference.html
Build info: version: '2.48.2', revision: '41bccdd', time: '2015-10-09 19:59:12'
System info: host: 'DESKTOP-PCD960U', ip: '192.168.1.3', os.name: 'Windows 10', os.arch: 'amd64', os.version: '10.0', java.version: '1.8.0_65'
Driver info: org.openqa.selenium.firefox.FirefoxDriver
Capabilities [{applicationCacheEnabled=true, rotatable=false, handlesAlerts=true, databaseEnabled=true, version=42.0, platform=WINDOWS, nativeEvents=false, acceptSslCerts=true, webStorageEnabled=true, locationContextEnabled=true, browserName=firefox, takesScreenshot=true, javascriptEnabled=true, cssSelectorsEnabled=true}]
Session ID: 164b1efc-9098-43b1-ad44-45da58b71f3c
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:206)
    at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:158)
    at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:647)
    at org.openqa.selenium.remote.RemoteWebElement.execute(RemoteWebElement.java:326)
    at org.openqa.selenium.remote.RemoteWebElement.getAttribute(RemoteWebElement.java:149)
    at com.crawlerr.pageObjects.Crawler4.processPage(Crawler4.java:52)
    at com.crawlerr.pageObjects.Crawler4.crawl(Crawler4.java:36)
    at com.crawlerr.pageObjects.Crawler4.Execute(Crawler4.java:25)
    at com.crawler.Tests.Crawler_Test.main(Crawler_Test.java:52)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:85)
    at org.testng.internal.Invoker.invokeMethod(Invoker.java:639)
    at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:821)
    at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1131)
    at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:124)
    at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:108)
    at org.testng.TestRunner.privateRun(TestRunner.java:773)
    at org.testng.TestRunner.run(TestRunner.java:623)
    at org.testng.SuiteRunner.runTest(SuiteRunner.java:357)
    at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:352)
    at org.testng.SuiteRunner.privateRun(SuiteRunner.java:310)
    at org.testng.SuiteRunner.run(SuiteRunner.java:259)
    at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
    at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
    at org.testng.TestNG.runSuitesSequentially(TestNG.java:1185)
    at org.testng.TestNG.runSuitesLocally(TestNG.java:1110)
    at org.testng.TestNG.run(TestNG.java:1018)
    at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:111)
    at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:204)
    at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:175)
Caused by: org.openqa.selenium.StaleElementReferenceException: Element not found in the cache - perhaps the page has changed since it was looked up
For documentation on this error, please visit: http://seleniumhq.org/exceptions/stale_element_reference.html
Build info: version: '2.48.2', revision: '41bccdd', time: '2015-10-09 19:59:12'
System info: host: 'DESKTOP-PCD960U', ip: '192.168.1.3', os.name: 'Windows 10', os.arch: 'amd64', os.version: '10.0', java.version: '1.8.0_65'
Driver info: driver.version: unknown
    at <anonymous class>.fxdriver.cache.getElementAt(resource://fxdriver/modules/web-element-cache.js:9351)
    at <anonymous class>.Utils.getElementAt(file:///C:/Users/Craig/AppData/Local/Temp/anonymous8982667753843323416webdriver-profile/extensions/fxdriver@googlecode.com/components/command-processor.js:8978)
    at <anonymous class>.WebElement.getElementAttribute(file:///C:/Users/Craig/AppData/Local/Temp/anonymous8982667753843323416webdriver-profile/extensions/fxdriver@googlecode.com/components/command-processor.js:12019)
    at <anonymous class>.DelayedCommand.prototype.executeInternal_/h(file:///C:/Users/Craig/AppData/Local/Temp/anonymous8982667753843323416webdriver-profile/extensions/fxdriver@googlecode.com/components/command-processor.js:12534)
    at <anonymous class>.fxdriver.Timer.prototype.setTimeout/<.notify(file:///C:/Users/Craig/AppData/Local/Temp/anonymous8982667753843323416webdriver-profile/extensions/fxdriver@googlecode.com/components/command-processor.js:621)


===============================================
    Default test
    Tests run: 1, Failures: 1, Skips: 0
===============================================


===============================================
Default suite
Total tests run: 1, Failures: 1, Skips: 0
===============================================

try {
    href = crawlList.get(i).getAttribute("href");

    if (href != null && isAddressValid(href, startingUrl)) {
        if (!alreadyListed.contains(href)) {
            System.out.println("Added to list - " + href);
            alreadyListed.add(href);
            queue.add(href);
        } else {
            System.out.println("Already added to list - " + href);
        }
    } else {
        System.out.println("Not valid - " + href);
    }

} catch (StaleElementReferenceException e) {
    // do nothing
}