What do you mean by Maven's External Dependencies?

Addition of Maven's External Dependencies

We are considering the example of adding sqljdbc.jar external dependency in our Maven project. Here, we add sqljdbc.jar to the mavenproject created in Maven NetBeans (with the help of this article, you will also learn how to make any project in Maven).

• Open your Maven project in which you want to add the external dependencies.

The project structure looks somewhat like this in the beginning.
 

• Create a folder in your project’s root directory. Here, I’m creating a folder named libs (you can keep any). Steps for making a new folder - 
  • Right-click on the project → properties. Check the location of the project.
     
  • Go to that location and make a new folder (here, libs).
     
  • You will find that a folder named libs has been added to your project structure.
     
• Download the sqljdbc.jar external dependency and add it to this newly created libs folder.
   
• Now, add this new dependency in the pom.xml of your project using the code below -

<dependencies>
        <dependency>
            <groupId>sqljdbc</groupId>
            <artifactId>sqljdbc</artifactId>
            <scope>system</scope>
            <version>1.0</version>
            <systemPath>${project.basedir}\libs\sqljdbc.jar</systemPath>
        </dependency>
</dependencies>

The format for adding dependencies remains the same. You can refer to this to learn more about dependencies and their scope.

• groupId must be the name of the jar file.
   
• artifactId must also be the name of the jar file.
   
• scope specifies the stage up to which you can include a dependency.
   
• systemPath specifies the relative path of the jar file to the project location.
   

Using the steps shown above, you can add as many external dependencies as possible based on the project’s demand.

Frequently Asked Questions

How to use Maven's external dependencies?

The external dependencies are added in the pom.xml files under the <dependencies> and further <dependency> section based on the needs of your project.

What does the SNAPSHOT keyword signify?

The SNAPSHOT keyword used while creating a project signifies that the project is still under development, which means the code can change or be unchanging.

How to deploy the JAR file in the remote repository?

Using pom.xml and settings.xml, you can deploy jars to external repositories by specifying the repository URL and authentication information.

Why use external dependencies?

You need to use external dependencies when any particular dependency is unavailable in the Maven remote, local and central repositories.

Why is it advised to keep the external dependencies in Maven’s local repository rather than the remote repository?

Local repositories consume less space, are easily accessible, and there is no need to take care of versioning for jars; therefore, it is advised to keep the external dependencies in the local repository.

Conclusion

In this article, you learned about Maven's external dependencies, their needs, and how to use them in our Maven project. At this point, you might have learned a lot about Maven. If not, then read the following articles:

• Architecture of Maven
• Maven Configuration Properties
• Ant vs. Maven
• How to install Maven on Windows
• Introduction to Maven Command
• What are the features or advantages of Maven
   

If you’re thorough with Maven, check out Maven Interview Questions.

For leading and upskilling yourself in the right direction, check out the guided paths by various industry experts. Here you will learn Data Structures and Algorithms, Competitive Programming, System Design, and many more courses on our fully-fledged platform Coding Ninjas Studio. After availing of the benefits from our courses, you may check out your competency by referring to the mock test and problems available. Take a look at the interview experiences and interview bundle for placement preparations.

Happy Learning :)