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UnexpectedTagNameException: Element should have been "select" but was "a" while trying to get the texts of dropdown menu using Selenium and Java

While trying to get the menu list, I'm getting this error message:
Exception in thread "main" org.openqa.selenium.support.ui.UnexpectedTagNameException: Element should have been "select" but was "a".
Here below is the code:
public static void main(String[] args) {
// TODO Auto-generated method stub
System.setProperty("webdriver.chrome.driver", "D:\\selenium files\\chromedriver_win32_new\\chromedriver.exe");
WebDriver driver = new ChromeDriver();
driver.manage().window().maximize();
driver.get("https://www.tutorialspoint.com/tutor_connect/index.php");
driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
WebElement ele = driver.findElement(By.xpath("//*[#id=\"logo-menu\"]/div/div[1]/div/a"));
Select s = new Select(ele);
//getting list of menu
List <WebElement> op = s.getOptions();
int size = op.size();
for(int i =0; i<size ; i++){
String options = op.get(i).getText();
System.out.println(options);
}
}
}

That is because the element you are trying to cast is a link tag and not a select tag.
You need to give the Xpath or CSS of the correct Select element and then cast it from WebElement into a Select ojbect.
In the example you are using there is not real selector, you first need to click on the buttons that says "Categories" and later take the options that appear:
WebElement button = driver.findElementByCSS("div[class='mui-dropdown']");
button.click();
WebElement SelectObj = driver.findElementByCSS("ul[class*='mui--is-open']");
Select s = new Select(SelectObj);

The desired element is not a <select> element but a <ul> element. Once you click on the <a> element then only the classname mui--is-open is appended to the desired <ul> element.
Solution
So to get the contents of the dropdown menu you need to induce WebDriverWait for the visibilityOfAllElementsLocatedBy() and you can use Java8 stream() and map() and you can use either of the following Locator Strategies:
Using cssSelector:
new WebDriverWait(driver, 20).until(ExpectedConditions.elementToBeClickable(By.cssSelector("a.mui-btn.mui-btn--primary.categories"))).click();
System.out.println(new WebDriverWait(driver, 20).until(ExpectedConditions.visibilityOfAllElementsLocatedBy(By.cssSelector("ul.mui-dropdown__menu.cat-menu.mui--is-open a"))).stream().map(element->element.getText()).collect(Collectors.toList()));
Using xpath:
new WebDriverWait(driver, 20).until(ExpectedConditions.elementToBeClickable(By.xpath("//a[#class='mui-btn mui-btn--primary categories']"))).click();
System.out.println(new WebDriverWait(driver, 20).until(ExpectedConditions.visibilityOfAllElementsLocatedBy(By.xpath("//ul[#class='mui-dropdown__menu cat-menu mui--is-open']//a"))).stream().map(element->element.getText()).collect(Collectors.toList()));
References
You can find a couple of relevant detailed discussions in:
How to extract the text iterating specific rows within a table using XPath with Selenium and Java
How to extract the dynamic values of the id attributes of the table elements using Selenium and Java
How to print runs scored by a batsmen in a scoreboard format webelements through CSS selector using Selenium and Java

I am getting org.openqa.selenium.ElementNotInteractableException error.can anyone help how to use explicit wait on list?

I want to click a link which is inside li tag but i am unable to click the link as i'm getting org.openqa.selenium.ElementNotInteractableException error.
I am able to list out the Webelements from HTML code but unable to click the desired one below is my code:
WebDriverWait wait = new WebDriverWait(driver, 10);
List<WebElement> list = driver.findElements(By.xpath("//div[contains(#class,'menuRoot')]//ul//li//a"));
System.out.println(list.size());
for(int i=0;i<list.size();i++) {
System.out.println(list.get(i).getText());
if(list.get(i).getText().equals("Workflow")) {
//driver.manage().timeouts().implicitlyWait(20, TimeUnit.SECONDS);
wait.until(
ExpectedConditions.visibilityOfElementLocated(By.xpath("/html/body/div[1]/ul/li[5]/a"))
);
list.get(i).click();
break;
}
}
There is one link in Frame and its in ul,li a tag unable to click the desired link after switching to frame.

Use JavascriptExecutor as below for clicking element:
WebElement element = list.get(i);
JavascriptExecutor executor = (JavascriptExecutor)driver;
executor.executeScript("arguments[0].click();", element);

Automatic Horizontal scroll not working in Selenium

I have tried many codes but none worked for me.The site is built in Angular.
WebElement columnElement = driver.findElement(By.id("i301Indv"));
((JavascriptExecutor)getDriver()).executeScript(
"arguments[0].scrollIntoView(true);", columnElement);
WebElement columnElement = driver.findElement(By.id("i301Indv"));
((JavascriptExecutor)getDriver()).executeScript(
"arguments[0].scrollIntoView();", columnElement);
WebElement columnElement = driver.findElement(By.id("i301Indv"));
((JavascriptExecutor) driver).executeScript(
"arguments[0].scrollLeft = arguments[0].offsetWidth", columnElement);

Try this:
Actions actions = new Actions(Webdriver);
actions.moveToElement(webElement).click().build().perform();
This will find the element, move to that element and perform the click operation.

Selenium cannot select dropdown on span element

To get the element I have used a nested loop.I am able to click on dropdwn.PFB the code:
List<WebElement> webElements1 = driver.findElements(By.className("selectboxit"));
for(WebElement webElement1 : webElements1) {
if( webElement1.getAttribute("name").equals("TransactionHistoryFG.OUTFORMAT"))
{
WebElement web1 = webElement1.findElement(By.className("selectboxit-text"));
web1.click();
}
}
When i am trying to use Select on webelement i am getting error :
org.openqa.selenium.support.ui.UnexpectedTagNameException: Element
should have been "select" but was "span"
How can i select dropdown i span element?

Possible solution for selecting dropdown using selenium webdriver is:
Select select = new Select(driver.findElement(By.xpath("//path_to_drop_down")));
select.deselectAll();
select.selectByVisibleText("Value1");
Instead of the approach you mentioned above, let me know if this helps :)

List<WebElement> webElements1 = driver.findElements(By.cssSelect(".selectboxit"));
for(WebElement webElement1 : webElements1) {
if( webElement1.getAttribute("name").equals("TransactionHistoryFG.OUTFORMAT"))
{
WebElement web1 = webElement1.findElement(By.className("selectboxit-text"));
JavascriptExecutor js = (JavascriptExecutor)driver;
js.executeScript("arguments[0].click();", web1);
}
}

Well, it is not the best way to do it, but in some cases it can be used:
it will open your combobox
driver.findElements(By.cssSelect(".selectboxit")).click()
now, you just need to write the specified value
driver.findElements(By.cssSelect(".selectboxit")).sendKeys("<value>");
OR
driver.findElements(By.cssSelect(".selectboxit")).sendKeys(Keys.ARROW_DOWN).
Use "ARROW_DOWN" as wanted to select your specified value.

How to handle AutoSearch completion using Selenium webdriver

I am running Selenium Web-driver using JAVA and facing an issue with auto-suggest input text field. When I enter a String "books" in the text field, an option would show up. Then I want to click or select the input populated on the auto suggest menu.
Below is the code:
WebDriver driver = new FirefoxDriver();
driver.get("http://www.amazon.com/");
driver.findElement(By.id("twotabsearchtextbox")).sendKeys("books");
WebElement myDynamicElement = (new WebDriverWait(driver, 10)).until(ExpectedConditions.presenceOfElementLocated(By.id("gwcswTooltip")));
List<WebElement> findElements = driver.findElements((By.id("gwcswTooltip").name("books on")));
for (WebElement webElement : findElements)
{
System.out.println(webElement.getText());
}

You need to just pick the right locator.
Add the following line
List<WebElement> findElements = driver.findElements((By.xpath("//div[#id='srch_sggst']/div")));
instead of
List<WebElement> findElements = driver.findElements((By.id("gwcswTooltip").name("books on")));