Maven Basics
1. What is Maven? Maven is a tool that helps to build and manage Java projects. It handles things like downloading the libraries that project needs, compiling the code, running the tests, and packaging everything into a final file called .jar. Instead of doing all of this manually, Maven does it for you based on a set of rules written in a file called pom.xml. 2. Advantages of Maven Maven…
Maven is a tool that simplifies the process of building and managing Java projects. It takes care of tasks such as downloading necessary libraries, compiling code, running tests, and creating a final .jar file. To use Maven, you write a set of rules in a file called pom.xml, and Maven follows these instructions to build your project.
One advantage of using Maven is that it automatically downloads and manages the libraries (dependencies) needed for a project, eliminating the need to add them manually. Maven also enforces a standard project structure, making it easy for developers to find their way around a new project. Additionally, Maven provides a straightforward build process, allowing developers to compile code, run tests, and package the entire project with a single command like 'mvn install'.
To install Maven, first ensure that Java (JDK) is installed, as Maven requires it to run. Check the Java version with the command 'java -version'. Then, update the package list and install Maven using 'sudo apt update sudo apt install maven'. Finally, verify the installation by checking the Maven version with 'mvn -version'.
Maven uses three types of repositories: local, central, and remote. The local repository is a folder on the developer's computer where Maven stores downloaded libraries. If a library has been downloaded before, Maven can reuse it from the local repository instead of re-downloading it each time. The central repository is the default, public repository on the internet (Maven Central) that contains thousands of common libraries.
If a library is not in the local repository, Maven will look for it in the central repository. Lastly, a remote repository is a private or custom repository set up by a company or team, often using tools like Artifactory. This type of repository is useful for storing internal libraries that are not meant to be public or for controlling which versions of dependencies are approved for use across a team.
To run unit tests with Maven, use the command 'mvn test'. This command compiles the code and runs all test classes found under the 'src/test/java' directory. Maven utilizes a plugin called 'Surefire' to execute the tests and provides an output indicating the number of tests run, any failures, errors, or skipped tests. If a test fails, the output will include details on which test failed and why, making debugging easier.
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