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Apache Maven Cookbook

You're reading from   Apache Maven Cookbook Over 90 hands-on recipes to successfully build and automate development life cycle tasks following Maven conventions and best practices

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Product type Paperback
Published in Apr 2015
Publisher Packt
ISBN-13 9781785286124
Length 272 pages
Edition 1st Edition
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Table of Contents (13) Chapters Close

Preface 1. Getting Started 2. IDE Integration with Maven FREE CHAPTER 3. Maven Lifecycle 4. Essential Maven Plugins 5. Dependency Management 6. Code Quality Plugins 7. Reporting and Documentation 8. Handling Typical Build Requirements 9. Multi-module Projects 10. Java Development with Maven 11. Advanced Maven Usage Index

Getting into dependency and avoiding dependency hell


As you use a number of dependencies, each of them in turn may also include further dependencies. A situation may come when there are multiple versions of the same dependencies in the project. This can often lead to errors.

Getting ready

To understand this, we need to have a fairly complex project that has several transitive dependencies. You can look at one such project at https://github.com/selendroid/demoproject-selendroid.

Clone the repository on your system. Now, we are ready to see how complex dependencies can get.

How to do it...

Use the following steps to avoid dependency hell:

  1. Run the following command:

    mvn dependency:tree -Dverbose
    
  2. Note the output as shown in the following screenshot:

How it works...

As you can see, in the course of identifying the dependencies to be used in the project, Maven does a dependency analysis. This reveals two things:

  • Two or more dependencies require the same version of another dependency. Maven includes a dependency...

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