No more /src/main/webapp/vendor/jquery.min.js, or /styles/bootstrap.css! Just a Maven dependency like the other libraries. WebJars are client-side web libraries (e.g. jQuery & Bootstrap) packaged into JAR (Java Archive) files.
Why?
Maven is great on managing jars, but not so good for static web dependencies like CSS or JS files packaged in a zip. With Webjars you can have AngularJS or Bootstrap in your pom.xml, like you did with Bower on a web project.
How?
maven pom.xml (manage web dependencies)
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.damienfremont.blog</groupId>
<artifactId>20151007-javaee-webjars</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<dependencies>
<!-- WEB DEPENDENCIES -->
<dependency>
<groupId>org.webjars</groupId>
<artifactId>bootstrap</artifactId>
<version>3.3.5</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>jquery</artifactId>
<version>2.1.4</version>
</dependency>
<!-- WEB DEPENDENCIES SERVLET -->
<dependency>
<groupId>org.webjars</groupId>
<artifactId>webjars-servlet-2.x</artifactId>
<version>1.1</version>
</dependency>
</dependencies>
</project>
webapp web.xml (declare webjars servlet)
index.html (standard example, use webjars paths)
<!DOCTYPE html> <head> <!-- ADD ALL YOUR CSS DEPENDENCIES HERE... --> <link rel="stylesheet" href="webjars/bootstrap/3.3.5/css/bootstrap.css"> </head> <body> <!-- DO YOUR THING HERE... --> Hello world! <!-- ADD ALL YOUR JS DEPENDENCIES HERE... --> <script src="webjars/jquery/2.1.4/jquery.js"></script> <script src="webjars/bootstrap/3.3.5/js/bootstrap.js"></script> </body> </html>
Only pom.xml and web.xml are required to manage web depencies. And you’ll see your web dependencies like the others.
Demo
Run this project on your webapp server (Tomcat for example), and test on:
http://localhost:8080/20151007-javaee-webjars/
Conclusion
A good tool, and a big maven repository behind it (org.webjars).
Pro:
- faster: less work adding a web library
- safe: no copy/paste error on web libs
- clean: no more binaries in your source repositories!
Con:
- perf: a servlet is serving the static files (be sure to put a cache server in front of your app)
You will find a lot more libs at mvnrepository or webjars.org !
Sources
https://github.com/DamienFremont/blog/tree/master/20151007-javaee-webjars
Hello, I made a little experience with webjars, using it to versioning javascript sources in some applications.
It could be very usefull, but I found a lot of times older versions that I can find directly with git hub… or the are different entries that refer to the same js…
ie (just to explain): find “clipboard” on webjars.org you can find different entries for the same script, these two refer to the same script, in different ways
“org.webjars” % “clipboard.js” % “1.5.5”
2 Files
zeroclipboard
“org.webjars.bower” % “clipboard” % “1.5.15”
7 Files
Do I miss something?
/*!
* clipboard.js v1.5.15
* https://zenorocha.github.io/clipboard.js
*
* Licensed MIT © Zeno Rocha
*/
or look for “swiper” (iDangerous) you can find 3 entries with different versions…
I’m a bit confused..
thanks for your attention 😉
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