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How to locate dynamic downloaded filename using Selenium + Java

I am not able to locate the chrome downloaded filename using locator. I need to get the filename to proceed further on automation to verify the content.
Element HTML:
<a is="action-link" id="file-link" focus-row-control="" focus-type="fileLink" tabindex="0" role="link" href="https://energyfuture.cgi.com/pasdemo/operations/QueryDisplay!displayQuery.action?QUERY_TIMESTAMP=1614571607262" class="">Facility Balance_1614571607828.xlsx</a>
Here the numbers of filename are dynamic, but the prefix Facility Balance will be constant.
code I have tried:
driver.navigate().to("chrome://downloads/");
String Text = driver.findElement(By.xpath("//*[#id='file-link']")).getText();
OR
String AttributeData = driver.findElement(By.xpath("//*[contains(text(),'Facility Balance')]")).getAttribute("linkText");

For starters
.getAttribute("linkText");
will not work because your target node does not contain an attribute called linkText.
The second point,
By.xpath("//*[#id='file-link']")
might not work if you have multiple elements with the same ID on the page (this include popups). Consider refining your xpath to be more explicit. For example, By.xpath("//a[#id='file-link' and ...]") where the ... are additional conditions that will refine your search to find only one.
Out of curiosity, did you try your Xpath directly in the browser developer's tools? Before you attempt to code things like this, you should always attempt to evaluate your XPath expressions to make sure that 1) they are accurate and 2) they are not ambiguous. Unfortunately, given the amount of information posted, this is the extent of the help I can give you.

selenium web driver : Unable to locate element

Well not to mention that I'm new on using the selenium web driver, I'm trying to automatize a mailbox so I can log myself in and to send a message, the thing is that I download the firebug plugin for Mozilla, that is the browser I'm currently working with, when I'm trying to find the element for the log in and the password everything goes well, because I do it by their name.
input class="_nb-input-controller" type="text" **name="login"** autocorrect="off" autocapitalize="off" value=""
input class="_nb-input-controller" type="password" **name="passwd"** value=""
but as soon as im at the mailbox entry the identificator changes it, i go to compose link and this is the code that shows up:
a class="b-toolbar__item b-toolbar__item_compose js-toolbar-item-compose daria-action" title="Compose (w, c)" href="#compose" data-action="compose.go" data-params="toolbar=1&toolbar.button=compose"
Since I don't find any method that could help on this, a friend came and told me about the xpath which was:
/html/body/div[2]/div/div[5]/div/div[3]/div/div[2]/div/div/div/div[2]/a[2]
by doing this selenium did find the element and I could click on the icon,
but again.. when I'm trying to get into the "TO" prompt so I can write inside
it is not finding the element, not by xpath, or anything is there a way or formula to get elements or translate them into a way that selenium can find them???

oh i see, i re try with the element and i noticed that the one i wanted was showing as hidden using firebug so i just try the next one up and the web driver could locate the item, it was a simple app to send an email the prompt that i wanted to locate was the 'TO' field. and thanks guys for giving me the correct way of using the Xpath property

Having locators such as :
/html/body/div[2]/div/div[5]/div/div[3]/div/div[2]/div/div/div/div[2]/a[2]
is generally a bad idea. If you want to build a stable test I would suggest you stay away from such.
Now I see you have attributes like #name and #class. XPath is provides you with a way to reach these elements directly by pointing the identifiers instead of the whole path to the element.
You can try something like:
//input[#name='login']
//input[#name='password']
More info at: http://www.w3schools.com/xsl/xpath_intro.asp

Selenium WebDriver Finding Element by Partial Class Name

In the frame I'm working with, I have the following element:
<div class="x-grid3-cell-inner x-grid3-col-expRepCol"> New session from client IP 192.168.5.3 (ST=/CC=/C=) at VIP 192.168.5.2 Listener /Common/Tomcat (Reputation=Unknown)</div>
As well as many other similar elements. I am trying to locate this element by partial name text and click it with the following code:
String expectedText = "New session from client IP";
driver.findElement(By.className("div[class*='"+expectedText+"']")).click();
And I have also tried with cssSelector:
String expectedText = "New session from client IP";
driver.findElement(By.cssSelector("div[class*='"+expectedText+"']")).click();
But WebDriver keeps throwing an exception stating it's unable to locate that element. Any suggestions as to what could be the problem?

<div class="dd algo algo-sr Sr" data-937="5d1abd07c5a33">
<div class="dd algo algo-sr fst Sr" data-0ab="5d1abd837d907">
Above 2 are the HTML elements in yahoo search results. So if we wanna get these elements using partial class name with selenium python, here is the solution.
driver.find_element_by_css_selector("div[class^='dd algo algo-sr']")
In the same way we can get any elements with partial match on any attribute values like class name, id etc.
find elements with css selector partial match on attribute values

By.className is looking for a class with the name entered.
By.cssSelector is looking for a match for the selector you entered.
What you're attempting is to match the text of the div against class, which won't work.
You can try something like this:
driver.findElement(By.xpath("//div[contains(text(),'"+expectedText+"')]")).click();

I believe this will work:
driver.findElement(By.className("x-grid3-cell-inner x-grid3-col-expRepCol").click();

Select invalid html-tag with Selenium

I am trying to get a WebElement with Selenium:
driver.findElement(By.xpath("//input[#name='j_username']"))
But Selenium says: "Unable to find element with XPath ...".
The XPath is valid, I proofed it with FirePath.
But the input element has the following invalid code:
<input size="10" type="text" name="j_username" maxlength="8">
I can't change the html-file, despite the fact is there any solution to get the webElement?
Thanks in advance!

try select element with css selector. and also verify in firepath(firebug addon that element is located properly).
so your css selector be something like
input[name='j_username']
2nd approach is to use internal firebug mechanism for finding xPaths of elements.
See screen attached below
After these manipulations driver shoulda handle element properly.

Well I will suggest adding an id to your html code -
<input id="j_username"size="10" type="text" name="j_username" maxlength="8">
and findElement by id -
driver.findElement(By.id("j_username"));
I have faced similar issues with xpath(borwser issues??) but id never fails for me. ;)
By the way I feel your code should be -
driver.findElement(By.xpath(".//*[#name='j_username']"));

The best solution is to find out what selenium is doing wrong, but without a URL or sample page to test on it's a little hard. Is there anyway you could dump the HTML into a jsfiddle? If there is do that and paste the url into the question and I'm sure someone can find a solution.
If not however, another way to get the results is to do it with jQuery. If firebug is picking it up but not selenium, then there's no reason why jQuery wouldn't get it. Here's how to go about doing that if needed:
Step 1: Is jQuery already present on the page? If so then you don't need to do this bit, otherwise you will need to add it yourself by using driver.executeScript(addjQueryScript) where the script does something like this.
Step 2: call WebElement input = driver.executeScript(elementSelector); where the elementSelector script would be something like \"return $('input[name=\"j_username\"]')\");
My jQuery's not so good, but I believe that should work...
Best of luck!

HtmlUnit accessing an element without id or Name

How can I access this element:
<input type="submit" value="Save as XML" onclick="some code goes here">
More info: I have to access programmatically a web page and simulate clicking on a button on it, which then will generate a xml file which I hope to be able to save on the local machine.
I am trying to do so by using HtmlUnit libraries, but all examples I could find use getElementById() or getElementByName() methods. Unfortunately, this exact element doesn't have a name or Id, so I failed miserably. I supposed then that the thing I have to do is use the getByXPath() method but I got completely lost into XPath documentation(this matter is all new to me).
I have been stuck on this for a couple of hours so I really need all the help I can get.
Thanks in advance.

There are several options for an XPATH to select that input element.
Below is one option, which looks throughout the document for an input element that has an attribute named type with the value "submit" and an attribute named value with the value "Save as XML".
//input[#type='submit' and #value='Save as XML']
If you could provide a little bit more structure, a more specific (and efficient) XPATH could be created. For instance, something like this might work:
/html/body//form//input[#type='submit' and #value='Save as XML']
You should be able to use the XPATH with code like this:
client = new WebClient(BrowserVersion.FIREFOX_3)
client.javaScriptEnabled = false
page = client.getPage(url)
submitButton = page.getByXPath("/html/body//form//input[#type='submit' and #value='Save as XML']")

Although I would, in most cases, recommend using XPath, if you don't know anything about it you can try the getInputByValue(String value) method. This is an example based on your question:
// Fetch the form somehow
HtmlForm form = this.page.getForms().get(0);
// Get the input by its value
System.out.println(form.getInputByValue("Save as XML").asXml());