Book Image

Maven Essentials

By : Russell E Gold, Prabath Siriwardena
5 (1)
Book Image

Maven Essentials

5 (1)
By: Russell E Gold, Prabath Siriwardena

Overview of this book

Maven is the #1 build tool used by developers and it has been around for more than a decade. Maven stands out among other build tools due to its extremely extensible architecture, which is built on of the concept of convention over configuration. It’s widely used by many open source Java projects under Apache Software Foundation, Sourceforge, Google Code, and more. Maven Essentials is a fast-paced guide to show you the key concepts in Maven and build automation. We get started by introducing you to Maven and exploring its core concepts and architecture. Next, you will learn about and write a Project Object Model (POM) while creating your own Maven project. You will also find out how to create custom archetypes and plugins to establish the most common goals in build automation. After this, you’ll get to know how to design the build to prevent any maintenance nightmares, with proper dependency management. We then explore Maven build lifecycles and Maven assemblies. Finally, you will discover how to apply the best practices when designing a build system to improve developer productivity.
Table of Contents (15 chapters)
Maven Essentials
Credits
About the Author
Acknowledgments
About the Reviewer
www.PacktPub.com
Preface
Index

Get rid of unused dependencies


Always ensure that you maintain a clean application POM file. You should not have any unused dependencies defined or used undeclared dependencies. The Maven dependency plugin helps you in identifying such discrepancies.

The maven-dependency-plugin is not defined in the super POM and should be explicitly defined in your project POM file:

<plugin>
  <artifactId>maven-dependency-plugin</artifactId>
  <version>2.0</version>
</plugin>

Once the preceding configuration is added into your application POM file, you need to run the analyze goal of the dependency plugin against your Maven project:

$ mvn dependency:analyze

Here, you can see a sample output, which complains about an unused declared dependency:

[WARNING] Unused declared dependencies found:
[WARNING] org.apache.axis2:axis2-kernel:jar:1.6.2:compile

Note

More details about the Maven dependency plugin are available at http://maven.apache.org/plugins/maven-dependency-plugin/.