External files (css, js) in embedded jetty

Question

With jetty, you can easily produce "html" response importing external file like :

<head>
<link rel="stylesheet" type="text/css" href="myStyle.css">
<script src="myScript.js"></script>
<head>

However, where do you put myStyle.css and myScript.js, when jetty is embedded?

Especially when the jetty server is in a large OpenSource project not written by you?

Is there by any chance a nice out.println(???); in the servlet.doGet that would provide the answer, or something similar?

judoole judoole · Accepted Answer · 2014-06-14T08:29:56

I think this depends on how you package your jar. For example if you package it like a one-jar all classes and resources from your own code and dependencies are exploded into a jar/war. Then you'll have to set the webcontext to Jetty accordingly. A couple of examples using Maven and Gradle that might shine some light:

http://open.bekk.no/embedded-jetty-7-webapp-executable-with-maven
https://github.com/jhannes/java-ee-turnkey/

Given the latter example it is resolved something along these lines:

URL[] urls = ((URLClassLoader) AbstractServerMain.class.getClassLoader()).getURLs();
WebAppContext context;
if (urls.length == 1 && urls[0].getFile().endsWith(".war")) {
    context = new WebAppContext(urls[0].getFile(), contextRoot);
} else {
    context = new WebAppContext("src/main/webapp", contextRoot);
}

This will ensure that you can also run from Eclipse/IntelliJ etc.
The first example uses ProtectionDomain

// Get the war-file
ProtectionDomain protectionDomain = Main.class.getProtectionDomain();
String warFile = protectionDomain.getCodeSource().getLocation().toExternalForm();
String currentDir = new File(protectionDomain.getCodeSource().getLocation().getPath()).getParent();

// Add the warFile (this jar)
WebAppContext context = new WebAppContext(warFile, contextPath);

This is not so friendly when running from your Eclipse/IntelliJ though.

Should you choose to not do a one-jar and go for the Gradle application-plugin or Maven appassembler you might have to either copy the resources into your "Main-jar" (the one firing up Jetty) or setting the webcontext to the jar containing the resources. Revealing now that I'm not too familiar on how to...

External files (css, js) in embedded jetty

1 Answers