miércoles, octubre 07, 2015

Gradle and Java EE

In the last years Apache Maven has become the de-facto build tool for Java and Java EE projects. But from two years back Gradle is gaining more and more users. In this post you are going to see how to use Gradle for Java EE projects.

Gradle is a build automation tool like Ant or Maven but introducing a Groovy-based DSL language instead of XML. So as you might expect the build file is a Groovy file.

There are different ways to install Gradle, but for me the best way is using sdkman tool. To install sdkman tool simply run:

$ curl -s get.sdkman.io | bash

After that you can init sdkman by running:

$ source "$HOME/.sdkman/bin/sdkman-init.sh"

With sdkman installed, installing Gradle is as easier as running:

$ sdk install gradle

Now you can start creating the build script. The first thing to do is creating a settings.gradle where in this case we are going to set the name of the project.

This file is also used in case of multiple module projects.

Last file you might need is one called build.gradle which manages all the build process.

Notice that the first line indicates that what you are going to build is a war project.  Then project properties are set like the group, version, description or Java compilation options. Finally only one dependency is required and with provided scope since the implementation is provided by the application server.

Note that providedCompile scope is only available if you are using the war plugin. If you are using another plugin like java, then you will need to implement this function by yourself (at least at the time of writing this post with Gradle  2.7).

And that's all, pretty compact, only 16 lines and no verbose information. Of course, now you will need to add more dependencies like JUnit or Arquillian with testCompile scope or any other extra library required in your code like the well known apache-commons dependency; But this is an story for another post.

We keep learning,

Sun's in your eyes the heat is in your hair. They seem to hate you. Because you're there.  (Wonderful Life - Black)

6 comentarios:

Jason Porter dijo...

It would be great if you'd do a post on using https://spring.io/blog/2015/02/23/better-dependency-management-for-gradle with this, maybe Arquillian related? ;)

Alex Soto dijo...

Hehehe I had this in mind, but first I am waiting that the universe is released :)

Carles Figuera dijo...

Do you think Maven is going into disuse?
Also not using xml, has Gradle another benefit against Maven?

Alex Soto dijo...

Not sure, I think that Maven has its market as well as Gradle. I would say that if you relay a lot on Maven plugins or your Jenkins pipeline contains a lot of logic for building the application and you feel comfortable and it works then Maven will continue be a solution, but on the other side if you feel that you need some extra power, and have a build script more compact, not spread between the application and the build pipeline, then Gradle might be your solution.

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