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Unable to locate an element even when the xpath is correct

i'm tried to select an element from an auto suggestion field but i got always an error saying that the element could not be found even that i'm sure my xpath is correct
here's my code :
wait.until(ExpectedConditions.visibilityOfElementLocated(By.xpath("//*[#class=\"ui-menu-item-with-icon ui-menu-item\"][1]")));
driver.findElement(By.xpath("//*[#class=\"ui-menu-item-with-icon ui-menu-item\"][1]")).click();
it should find //*#class=\"ui-menu-item-with-icon ui-menu-item\" which is the first suggestion albert cammus
here's the outerHtml
<li class="ui-menu-item-with-icon ui-menu-item" role="menuitem">
<a class="ui-corner-all" tabindex="-1">
<span class="item-icon"></span>
Albert Camus (SARCELLES)</a>
</li>"

Your XPath is more or less OK apart from using wildcard which may result into longer processing so you can go for li instead of *.
Another option is sticking to the <a> tag containing the text you would like to click using normalize-space() function something like:
//a[normalize-space()="Albert Camus (SARCELLES)"]
Also your popup may reside within an iframe so you might have to switch the webdriver context to the relevant iframe element.

Why don't you try linkText over Xpath ?
linkText is more stable then Xpath, there's no doubt about that.
Code :
wait.until(ExpectedConditions.visibilityOfElementLocated(By.partialLinkText("Albert Camus (SARCELLES)")));
I'm not very sure about spaces in your HTML, that's the reason why I have used partialLinkText

How to get Css selector when using java?

I am having trouble in selecting a selector when I am trying to select it as a 'css-selector'
I have this selector:
<div role="button" class="jss300 jss299" tabindex="-1">
<span class="jss313">system-all</span></div>
</div>
and I am trying to get the css-selector from it, I tried this way:
"div[class~='system-paloaltonetworks']"
and my need is to get the text from the selector, in this case I want to get "system-paloaltonetworks" into string variable.
hope now the question is clear.

"system-paloaltonetworks" is the element text, not the class attribute (the class is jss313). You can't locate it with cssSelector you need to use xpath (you should also notice the element has span tag, not div)
driver.findElement(By.xpath("//span[text()='system-paloaltonetworks']"));

You are using class~= but aren't comparing with the class...
You try: driver.findElement(By.xpath("//*[#class='jss313']"));

How to select a nested webelement in html?

I would like to retrieve a webelement out of a nested html path using either css selectors or xpath. My specific use case is that I would like to select the i element in the following snippet:
<td class="headerActionsTd" data-rolename="Speaker">
<div class="headerActions">
<span class="addNewParticipantSection">
<i class="icon fa fa-user-plus" title="Add New"></i>
</span>
How do I obtain the i webelement for this using either css selector or xpath?

Use this xpath: //td[#data-rolename='Speaker']//div//span//i[#title='Add New'] or
css : div.headerActions i
driver.findElement(By.cssSelector("div.headerActions i"));
for multiple elements :
List<WebElement> users = driver.findElements(By.xpath("//td[#data-rolename='Speaker']//div//span//i[#title='Add New']"));

A simple one would be this :
CSS_SELECTOR
i.icon.fa.fa-user-plus[title='Add New']
Note that, if there is multiple element with this css selector, then you have this facility to differentiate between them:
:first-child
:nth-child(n)
:nth-last-child(n)
More can be found at this link
XPATH : would be :
//td[#data-rolename='Speaker']/descendant::span[#class='addNewParticipantSection']/i
Hope that helps.

Since you said data-role only changes in the comment of the other person, here is the xpath you can use
"//td[#data-role='Speaker']//i"
Or
"//td[#data-role='Speaker']/div/span/i"

Another option is that you can attempt to locate elements inside other elements. For example, you could store the addNewParticipantSection div in a WebElement, then use that WebElement's findElement method to locate the i element within it. Like so:
WebElement section = driver.findElement(By.className("addNewParticipantSection"));
WebElement icon = section.findElement(By.tagName("i"));
icon.click();

Clicking on Image Link with Selenium webdriver java

I have looked at the answers to similar questions and it seems like the code that I have should work but I get "Cannot click on element" error when the code invokes click on the web element.
Following is html markup segment
<div class="x-tree-node-item">
<a title="Manage Users" class="sidenavmenu_unselected" id="m-22" onclick="toggleMenu('22', '');" href="#">
<img title="" align="bottom" id="mi-22" alt="" src="ca/images/arrow.png" border="0">Manage Users
</a>
<div style="margin-left: 1em;">
<ul class="submenu-show" id="mp-22" style="height: auto; display: none;">
<li>
...
</li>
</ul>
</div>
Java code to locate the link is:
By xpath=By.xpath("//a[contains(#title,'Manage Users')]/img");
WebElement manageUsers = (new WebDriverWait(driver, 10))
.until(ExpectedConditions.presenceOfElementLocated(xpath));
manageUsers.click();
It finds the element but I get error:
org.openqa.selenium.ElementNotInteractableException: Cannot click on element
The ids are generated dynamically so we can't find by id and image source is used by multiple links.
Thank you for your help.
* Update *
The problem was solved with help from JeffC and Xwris. JeffC's last comment showed that there are multiple nodes being found. So, I added following code:
List<WebElement> manageUserImages=driver.findElements(xpath);
for (WebElement manageUserImage:manageUserImages) {
if (manageUserImage.isDisplayed()) {
manageUserImage.click();
}
}
Since there is only element displayed at one time with "Manage Users" as title, this finds the correct elements and delivers the desired results.
#JeffC, if you can post an answer with your comment, we can mark that answer as the correct answer.
Thanks again to everyone who helped.

It looks your xpath is wrong.
Personally I would start from the div and the drill down to the actual < a > tag.
In some cases where your web-element sits under a < li > tag, I would go even further up the tree and select a div which is not hidden.
i.e you instruct it to search for under the specific < div >
Who told you you can select only by id? You can use anything! :)
This should work.
//div[#class='x-tree-node-item']//a[#title='Manage Users']
This should work as well. Correct usage of 'contains' is as follows:
//div[#class='x-tree-node-item']//a[text()[contains(.,'Manage Users')]]
Hope this helps!
PS. notice that text contains is case-sensitive and will match partial text.
So if you searched for:
//a[text()[contains(.,'age User')]]
it will still be a successful match!
Update after OP's comments:
You don't actually need xpath helper. You just hit F12 in your browser and then CTRL+f so you open a search field at the bottom. Please see my example on how I locate the title of your question with partial text match ('Image').
Also notice next to xpath where it says 1 of 1 (meaning that our element is unique). Try to do the same for your case. I suspect that you need to go higher up the tree and start from an earlier < div > so you can locate the rest.

Leave off the "/img" part of your locator. You want to click the anchor (a) not the image itself.
By xpath=By.xpath("//a[contains(#title,'Manage Users')]");
WebElement manageUsers = (new WebDriverWait(driver, 10))
.until(ExpectedConditions.presenceOfElementLocated(xpath));
manageUsers.click();
Alternatively, the locator could be: //a[#id='m-22']

How to get a text from following div using Selenium Webdriver

I am trying to get the text content of the items inside the following 2 div elements but getting an error that the element cannot be found. For example the text content for first div is "Text1". How can I get that text?
So far, I have tried:
driver.findElement(By.xpath("//*[#id='ctrlNotesWindow']/div[3]/ul/div[1]/div[2]/div[2]")).getText())
and that complains of not finding that element.
Here is the html code:
<div class="notesData">
<div class="notesDate" data-bind="text: $.format('{0} - {1}', moment(Date).format('MMM DD, YYYY h:mm a'), User)">Text1</div>
<div class="notesText" data-bind="text: Note">Text2 on next line</div>
</div>
Here is the error, I get:
Exception in thread "main" org.openqa.selenium.NoSuchElementException:
Unable to locate element:
{"method":"xpath","selector":"//*[#id='ctrlNotesWindow']/div[3]/ul/div[1]/div[2]/div[2]"}

Don't use meaningless XPath. Your error message tells you "NoSuchElement", so you had your locator wrong, which has nothing to do with getText (not yet). Try using CssSelector or meaningful XPath:
driver.findElement(By.cssSelector("#ctrlNotesWindow .notesData > .notesDate")).getText();

If for whatever reason you'd want to stick with Xpath:
driver.findElement(By.xpath("//div[#class='notesData']/div[#class='notesDate']")).getText();
Otherwise, the css selector answer above is a good option.
Another alternative is to locate the element by class name:
driver.findElement(By.className("notesDate")).getText();

It works with:
driver.findElement(By.xpath("//div[#class='ui-pnotify-text']")).getText();
which is an PNotify notification.