Not navigating pagination3 and getting stale element exception - selenium

Question

I need to navigate pages and check services on each page down or up, but while navigating page 3 is showing error message as stale element exception.
I have tried with this code but it's not working fine , someone please help me on this.
public class TC_2377154_12236_Verify_SRS_ServerStatus_LinuxServer {
public static void TC_2377154_12236() {
try {
Assert.done("Start -> TC_2377154_12236");
//BaseSetUp.openBrowser();
WebDriver driver = FrameworkDriver.driver;
driver.get("https://webtech.humana.com/nes/servicesview.aspx");
Assert.assertTrue(driver.findElement(By.xpath("//input[#id='tbLBVServerName']")).isDisplayed(), "LBV Server name is displayed");
driver.findElement(By.xpath("//input[#id='tbLBVServerName']")).sendKeys("SRS");
Assert.assertTrue(driver.findElement(By.xpath("//input[#id='btnFilter']")).isDisplayed(),"Filter button is displayed");
driver.findElement(By.xpath("//input[#id='btnFilter']")).click();
Assert.assertTrue(driver.findElement(By.xpath("//table[#id='dgServices']")).isDisplayed(),"Services name table is Displayed");
WebDriverWait wait = new WebDriverWait(driver, 20);
wait.until( ExpectedConditions.presenceOfElementLocated(
By.xpath("//a[#style='color:Black;']")));
List<WebElement> pagination = driver.findElements(By.xpath("//a[#style='color:Black;']"));
int s = pagination.size()/2;
System.out.println(s +"Pagination list");
for(int i=0;i<=s;i++){
List<WebElement> ls = driver
.findElements(By
.xpath("//font[#color='red']"));
System.out.println(ls.size()+"list of Down services size");
if (ls.size() > 1)
Assert.fail("All service states are expected Up and Running but there are "+(ls.size()+" servers are down"));
else if (ls.size() == 0)
Assert.fail("****Some technical issue or No Server is up or running****");
else if (ls.size() == 1)
Assert.pass("~~All Servers are Up and running~~");
Thread.sleep(5000);
// ls.get(i).click();
// Thread.sleep(5000);
System.out.println( pagination.get(i));
//driver.findElement(By.xpath("//a[#style='color:Black;']")).click();
pagination.get(i).click();
Thread.sleep(5000);
}
Assert.done("End -> TC_2377154_12236");
} catch (Exception e) {
Assert.error(e, "Error -> TC_2377154_12236");
}
}
}
I expected output as it should click on each and every page , but getting below error
TC_2377154_12236_Verify_SRS_ServerStatus_LinuxServer-TC_2377154_12236 : PASS - Filter button is displayed
TC_2377154_12236_Verify_SRS_ServerStatus_LinuxServer-TC_2377154_12236 : PASS - Services name table is Displayed
7Pagination list
5list of Down services size
TC_2377154_12236_Verify_SRS_ServerStatus_LinuxServer-TC_2377154_12236 : FAIL - All service states are expected Up and Running but there are 5 servers are down
[[ChromeDriver: chrome on XP (4f932cb86e8057b5ecda92c582500243)] -> xpath: //a[#style='color:Black;']]
TC_2377154_12236_Verify_SRS_ServerStatus_LinuxServer-TC_2377154_12236 : FAIL - Error -> TC_2377154_12236. Error:stale element reference: element is not attached to the page document
(Session info: chrome=77.0.3865.90)
(Driver info: chromedriver=2.37.544315 (730aa6a5fdba159ac9f4c1e8cbc59bf1b5ce12b7),platform=Windows NT 10.0.16299 x86_64) (WARNING: The server did not provide any stacktrace information)
Command duration or timeout: 0 milliseconds
For documentation on this error, please visit: https://www.seleniumhq.org/exceptions/stale_element_reference.html
Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:25:48'
System info: host: 'WKR90LDWJ0', ip: '10.94.27.177', os.name: 'Windows 10', os.arch: 'x86', os.version: '10.0', java.version: '1.8.0_192'
Driver info: org.openqa.selenium.chrome.ChromeDriver
Capabilities {acceptInsecureCerts: false, acceptSslCerts: false, applicationCacheEnabled: false, browserConnectionEnabled: false, browserName: chrome, chrome: {chromedriverVersion: 2.37.544315 (730aa6a5fdba15..., userDataDir: C:\Users\VAM1449\AppData\Lo...}, cssSelectorsEnabled: true, databaseEnabled: false, handlesAlerts: true, hasTouchScreen: false, javascriptEnabled: true, locationContextEnabled: true, mobileEmulationEnabled: false, nativeEvents: true, networkConnectionEnabled: false, pageLoadStrategy: normal, platform: XP, platformName: XP, rotatable: false, setWindowRect: true, takesHeapSnapshot: true, takesScreenshot: true, unexpectedAlertBehaviour: , unhandledPromptBehavior: , version: 77.0.3865.90, webStorageEnabled: true}
Session ID: 4f932cb86e8057b5ecda92c582500243 Stack Trace: [Ljava.lang.StackTraceElement;#18d3f76
FAIL Error:stale element reference: element is not attached to the page document
(Session info: chrome=77.0.3865.90)
(Driver info: chromedriver=2.37.544315 (730aa6a5fdba159ac9f4c1e8cbc59bf1b5ce12b7),platform=Windows NT 10.0.16299 x86_64) (WARNING: The server did not provide any stacktrace information)
Command duration or timeout: 0 milliseconds
For documentation on this error, please visit: https://www.seleniumhq.org/exceptions/stale_element_reference.html
Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:25:48'
System info: host: 'WKR90LDWJ0', ip: '10.94.27.177', os.name: 'Windows 10', os.arch: 'x86', os.version: '10.0', java.version: '1.8.0_192'
Driver info: org.openqa.selenium.chrome.ChromeDriver
Capabilities {acceptInsecureCerts: false, acceptSslCerts: false, applicationCacheEnabled: false, browserConnectionEnabled: false, browserName: chrome, chrome: {chromedriverVersion: 2.37.544315 (730aa6a5fdba15..., userDataDir: C:\Users\VAM1449\AppData\Lo...}, cssSelectorsEnabled: true, databaseEnabled: false, handlesAlerts: true, hasTouchScreen: false, javascriptEnabled: true, locationContextEnabled: true, mobileEmulationEnabled: false, nativeEvents: true, networkConnectionEnabled: false, pageLoadStrategy: normal, platform: XP, platformName: XP, rotatable: false, setWindowRect: true, takesHeapSnapshot: true, takesScreenshot: true, unexpectedAlertBehaviour: , unhandledPromptBehavior: , version: 77.0.3865.90, webStorageEnabled: true}
Session ID: 4f932cb86e8057b5ecda92c582500243 Stack Trace:
org.openqa.selenium.StaleElementReferenceException: stale element reference: element is not attached to the page document
(Session info: chrome=77.0.3865.90)
(Driver info: chromedriver=2.37.544315 (730aa6a5fdba159ac9f4c1e8cbc59bf1b5ce12b7),platform=Windows NT 10.0.16299 x86_64) (WARNING: The server did not provide any stacktrace information)
Command duration or timeout: 0 milliseconds
For documentation on this error, please visit: https://www.seleniumhq.org/exceptions/stale_element_reference.html
Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:25:48'
System info: host: 'WKR90LDWJ0', ip: '10.94.27.177', os.name: 'Windows 10', os.arch: 'x86', os.version: '10.0', java.version: '1.8.0_192'
Driver info: org.openqa.selenium.chrome.ChromeDriver
Capabilities {acceptInsecureCerts: false, acceptSslCerts: false, applicationCacheEnabled: false, browserConnectionEnabled: false, browserName: chrome, chrome: {chromedriverVersion: 2.37.544315 (730aa6a5fdba15..., userDataDir: C:\Users\VAM1449\AppData\Lo...}, cssSelectorsEnabled: true, databaseEnabled: false, handlesAlerts: true, hasTouchScreen: false, javascriptEnabled: true, locationContextEnabled: true, mobileEmulationEnabled: false, nativeEvents: true, networkConnectionEnabled: false, pageLoadStrategy: normal, platform: XP, platformName: XP, rotatable: false, setWindowRect: true, takesHeapSnapshot: true, takesScreenshot: true, unexpectedAlertBehaviour: , unhandledPromptBehavior: , version: 77.0.3865.90, webStorageEnabled: true}
Session ID: 4f932cb86e8057b5ecda92c582500243
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:214)
at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:166)
at org.openqa.selenium.remote.http.JsonHttpResponseCodec.reconstructValue(JsonHttpResponseCodec.java:40)
at org.openqa.selenium.remote.http.AbstractHttpResponseCodec.decode(AbstractHttpResponseCodec.java:80)
at org.openqa.selenium.remote.http.AbstractHttpResponseCodec.decode(AbstractHttpResponseCodec.java:44)
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.RemoteWebElement.execute(RemoteWebElement.java:285)
at org.openqa.selenium.remote.RemoteWebElement.click(RemoteWebElement.java:84)
at com.humana.hss.scripts.TC_2377154_12236_Verify_SRS_ServerStatus_LinuxServer.TC_2377154_12236(TC_2377154_12236_Verify_SRS_ServerStatus_LinuxServer.java:54)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.dell.acoe.framework.run.ExecutionThread.run(ExecutionThread.java:33)
Executing method [TC_2377154_12236]... completed
There is an issue while updating the script status to excel report. Please check file:null
Total:2
Passed:1 50%
Custom Report Generator is configured as:
TC_2377154_12236_Verify_SRS_ServerStatus_LinuxServer-TC_2377154_12236 : DONE - Custom Report Generator is configured as:
is not a valid CustomReportGenerator, it needs package.Class.method format and with two String args
TC_2377154_12236_Verify_SRS_ServerStatus_LinuxServer-TC_2377154_12236 : DONE - is not a valid CustomReportGenerator, it needs package.Class.method format and with two String args

Answer 1

Don't retrieve multiple elements out of For Loop.
You should find each element in For Loop again.
WebElement pag = diver.findElement(By.xpath("(//a[#style='color:Black;'])["+(i+1)+"]"));
Xpath example (you can search in web console):
(//a[#style='color:Black;'])[1]
List<WebElement> pagination = driver.findElements(By.xpath("//a[#style='color:Black;']"));
int s = pagination.size()/2;
System.out.println(s +"Pagination list");
for(int i=0;i<=s;i++){
// Add this line
WebElement pag = diver.findElement(By.xpath("(//a[#style='color:Black;'])["+(i+1)+"]"));
List<WebElement> ls = driver.findElements(By.xpath("//font[#color='red']"));
System.out.println(ls.size()+"list of Down services size");
if (ls.size() > 1)
Assert.fail("All service states are expected Up and Running but there are "+(ls.size()+" servers are down"));
else if (ls.size() == 0)
Assert.fail("****Some technical issue or No Server is up or running****");
else if (ls.size() == 1)
Assert.pass("~~All Servers are Up and running~~");
Thread.sleep(5000);
// ls.get(i).click();
// Thread.sleep(5000);
System.out.println( pagination.get(i));
//driver.findElement(By.xpath("//a[#style='color:Black;']")).click();
// Modify this line
pag.click();
Thread.sleep(5000);
}