Creating a Project
You will need somewhere for your project to reside, create a directory somewhere and start a shell in that directory. On your command line, execute the following Maven goal:
If you have just installed Maven, it may take a while on the first run. This is because Maven is downloading the most recent artifacts (plugin jars and other files) into your local repository. You may also need to execute the command a couple of times before it succeeds. This is because the remote server may time out before your downloads are complete. Don't worry, there are ways to fix that.
Timer 5 Mins
- It truly takes 5 minutes to fill out the section and it is difficult to find an excuse NOT to do it each day. After giving up for years, I was prompted by the book 'The Miracle Morning' by Hal Elrod (a great book!) to take up journaling/scribing and found this wonderful journal.
- What is 0.5 hours in minutes? 0.5 hr to min conversion (htom). Swap units ↺ Amount. 0.5 Hours = 30 Minutes (exact result) Display result as. An hour is a unit of time equal to 60 minutes.
- 5 mins' would be appropriate unless you are expressing it as an adjective then use the singular form, as in a five minute break or the ten minute mark. However, in scientific writing, the abbreviation for the units is always in the singular form – 5min, 5km, 5kg.
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You will notice that the generate goal created a directory with the same name given as the artifactId. Change into that directory.
Under this directory you will notice the following standard project structure.
The src/main/java
directory contains the project source code, the src/test/java
directory contains the test source, and the pom.xml
file is the project's Project Object Model, or POM.
The POM
The pom.xml
file is the core of a project's configuration in Maven. It is a single configuration file that contains the majority of information required to build a project in just the way you want. The POM is huge and can be daunting in its complexity, but it is not necessary to understand all of the intricacies just yet to use it effectively. This project's POM is:
What did I just do?
You executed the Maven goal archetype:generate, and passed in various parameters to that goal. The prefix archetype is the plugin that provides the goal. If you are familiar with Ant, you may conceive of this as similar to a task. This archetype:generate goal created a simple project based upon a maven-archetype-quickstart archetype. Suffice it to say for now that a plugin is a collection of goals with a general common purpose. For example the jboss-maven-plugin, whose purpose is 'deal with various jboss items'.
Build the Project
The command line will print out various actions, and end with the following:
Unlike the first command executed (archetype:generate) you may notice the second is simply a single word - package. Rather than a goal, this is a phase. A phase is a step in the build lifecycle, which is an ordered sequence of phases. When a phase is given, Maven will execute every phase in the sequence up to and including the one defined. For example, if we execute the compile phase, the phases that actually get executed are:
- validate
- generate-sources
- process-sources
- generate-resources
- process-resources
- compile
You may test the newly compiled and packaged JAR with the following command:
Which will print the quintessential:
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