In Eclipse, I created a Dynamic Web Project and a JSP file under WebContent folder. I also created a CSS file under the WebContent folder. Then I use <link rel="stylesheet" type="text/css" href="XXX.css">
in the JSP to link to the CSS file but when I run on web server (Tomcat) the CSS didn't apply. Can someone tell me why?

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possible duplicate of [Browser can't access CSS and images when calling a Servlet which forwards to a JSP](http://stackoverflow.com/questions/3655316/browser-cant-access-css-and-images-when-calling-a-servlet-which-forwards-to-a-j/3658735#3658735) – BalusC Dec 06 '11 at 12:45
4 Answers
You must put your web project name before the address path of your css file
Example:
<link rel="stylesheet" href="/YourProjectName/XXX.css" type="text/css">
or in more dynamic way:
<link rel="stylesheet" href="${pageContext.request.contextPath}/XXX.css" />
Have fun :)

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You can use: With style.css file in WEB-INF/jsp folder
<style type="text/css">
<%@include file="css/style.css" %>
</style>
NOTE
This however copies the entire source of the CSS file into the HTML output of the JSP page. In other words, this is a server-side include, not a client-side resource reference. So you effectively miss the advantage that the browser can cache static resources and this way you end up with a bandwidth waste because the very same CSS file is embedded in every single page. In other words, a bad idea in terms of performance and efficiency.
as @BalusC described in comment! you want to test your style.css file anyway, this is a solution.

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6This however copies the entire source of the CSS file into the HTML output of the JSP page. In other words, this is a server-side include, not a client-side resource reference. So you effectively miss the advantage that the browser can cache static resources and this way you end up with a bandwidth waste because the very same CSS file is embedded in every single page. In other words, a bad idea in terms of performance and efficiency. – BalusC Jun 08 '12 at 03:07
You should restart eclipse so that it maps all css and javascript files again. I worked for me.

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