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Installing unirest-java with the Maven Assembly Plugin Posted 4 months ago

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Managing dependencies for your Java applications is difficult, unless you have Maven!  Maven is an Apache build manager for Java projects.  In this post, we will use a Maven plugin (Maven Assembly) to pull all the unirest-java dependencies in one bundle/jar file.

Let’s get started (the steps below assume you already have Java and Git installed):

Update: If you’re building for Android, please refer to this post.

1.  Download/Install Maven

To check if you already have Maven in your machine, run..

"mvn -version"

in your Terminal.  OS X prior to Maverick already comes with Maven.  If you don’t have Maven yet, you can head over to this download page and install it.  (Also make sure to set $JAVA_HOME accordingly).  If everything’s good, the output should look something like below:

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2.  Clone the unirest-java repository

Pick a folder where you want to clone the unirest-java repository, and run..

"git clone https://github.com/Mashape/unirest-java.git

This will download the source for unirest-java.  Note that in the root folder, there’s a pom.xml file.  This contains the directive for the Maven Assembly Plugin to generate a jar file of the unirest-java library bundled together with the required dependencies.

3.  Call the Maven Assembly plugin

To invoke the assembly plugin, run..

"mvn clean assembly:assembly"

Run this in the root folder of your cloned unirest-java repository.  This would pick up the directive in the pom.xml file and start bundling the unirest library into a jar file, along with its dependencies. It would also run unit tests to make sure everything’s good.

If successful, it should generate a /target folder with the following contents:

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The jar file we need is underlined in the image above.  We can then import this into our project like below (shown here in Eclipse):

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Here’s a sample code that uses unirest-java: