What is Maven & How Does It Works?

Maven is a software project management solution that also provides an overview and visualisation of the project to help with learning and exploration. Software Process Management is accomplished through organising the project's development, offering a standardised and streamlined method of specifying and maintaining the project's resources, files, and requirements, and sharing the project's resulting artefacts.

Generating information regarding the project, managing the reports, and documenting the initiative all contribute to visualising the project.

Maven in DevOps should be utilised in these scenarios:

• If the initiative has a significant number of dependencies.
• If the dependencies' version needs to be upgraded frequently.
• The task involves rapid documentation, compilation, and bundling of source code as JAR or ZIP files.

Understand more Maven interview questions before proceeding to learn more about Maven from this blog.

What is Apache Maven: Objective

Apache Maven is a software project management and build tool primarily used for Java-based projects. So what is Maven used for? Maven’s main objectives are:

Primary Objectives:

• Simplifying the build process: Maven aims to streamline the build process by providing a standardised framework for building and managing projects.
• Project structure standardisation: Maven promotes a standardised project structure, making it easier for developers to navigate and understand project layouts.
• Dependency management: Maven’s primary objective is to manage project dependencies, ensuring that all required libraries and frameworks are properly downloaded, installed, and configured.

Secondary Objectives:

• Reduced build times: Maven’s incremental build feature and caching mechanisms help reduce build times, making the development process more efficient.
• Improved collaboration: Maven facilitates collaboration among team members by providing a shared project structure and build process.
• Easy project migration: Maven’s standardised project structure and build process make migrating projects from one environment to another easier.

By achieving these objectives, Apache Maven has become a widely adopted tool in the software development industry, particularly for Java-based projects.

Why should we make use of the Maven system?

If you're an Eclipse user, there's no reason why you need to use Maven for developing projects. The ID environment that eclipse provides is all you need to get your project fully operational. In contrast to Maven, it does not build your code. If you're working on a Java project requiring you to use third-party libraries, you'll need to ensure you have the necessary dependencies in place. Dependencies are nothing more than the library or jar files.

The reason for its application:

• It is a development tool that creates libraries similar to jar files. However, the code is organised into a library that may be distributed.
• Because it is a dependency management solution, obtaining and managing dependencies is different from how we normally handle them.
• Its project management capabilities are stronger than other tools. Maven can save information about the software, such as the name and version number. So, it gave a general idea of what the initiative was about.
• Unlike other fields, it has a standardised method for developing software. Maven ensures that each project maintains consistency, which boosts productivity.
• Since it is a command-line platform, its instructions must be sent through the command prompt. To implement a system, it would do a set of tasks. Moreover, several IDEs, such as Eclipse, might be used to develop applications with Maven.

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Features of Maven

As modifications are made to Maven, clients may quickly update their configurations to take advantage of these changes. This is definite to both the initiatives and the individuals who use Maven.

The following are some of the Maven's most important features:

• Simple project configuration that adheres to best principles - The process of building a robust project can be finished in a moment.
• Consistent application throughout all initiatives - Since the tools are the same for all projects, it is easier and doesn't take any effort to show new programmers how to use them.
• Advanced interdependence administration - Dependencies are easy to set up. These can be automatically updated by only using the most current versions. Program dependencies can be closed or transitive – they have additional requirements and need to be included in the solution throughout development. In addition, we may now describe compile-time, testing, environment-specific, and production-time variables.
• Able to effortlessly manage many tasks simultaneously - A growing library and metadata repository ready to use right out of the box and also deals with the top Open Source projects to make their most recent releases instantly available.
• Extensible - Maven enables you to extend the basic maven process with custom plugins, including the ability to develop plugins or programming language relatively easily.
• Model-based development - Most of the time, no scripting is required for Maven to generate predefined output types like JARs and WARs or distributions from any number of projects. Instantaneous access to newly added functionalities with minimal or no additional configuration requirements
• Site providing project information that is well-organised - Using the same metadata as the construction process, Maven may generate a website or PDF and offer regular reporting on the project's development status, along with any documentation you desire.
• Publication of the release and control of its distribution - Maven integrates with your sources control system (like Git) and manages project releases based on tags. It can also send this information to a place where other projects can use it. Maven has the capability of publishing individual outputs like JAR files, archives that contain other documentation, and source distributions.
• The management of dependencies – Maven, promotes the usage of a centralised repository for JARs and some other dependencies. Maven has a way of downloading JARs from a central repository that may be used to build your project. Users of Maven are given the ability to reuse JARs across several projects, and collaboration between projects is encouraged to guarantee that concerns with backward compatibility are resolved. Outside of Maven, you can use tasks to handle and deploy.

Also Read: DevOps Automation Tools

What is Maven Architecture?

Apache Maven is a software project management and build tool that is based on a plugin-based architecture. Here is an overview of Maven’s architecture:

• Project Object Model: The POM is the core of Maven’s architecture It is an XML file (POM.XML) that contains information about the project, such as its name, version, dependencies, and build settings.
• Plugins: Maven plugins are reusable components that provide specific functionality, such as compiling code, running tests, or packaging artifacts. Plugins can be easily added or removed from a project.
• Maven Core: The Maven core is responsible for reading the POM and executing the build lifecycle.
• Build lifecycle: The build lifecycle is a series of phases Maven executes during the build process. The phases include validate, compile, test, package, verify, install, and deploy.

Maven Coordinates

Coordinates uniquely identify an artifact in a repository, just as an address identifies a building. Maven uses them both to name the project you are building and to locate every library it depends on.

<groupId>com.example.shop</groupId>

<artifactId>order-service</artifactId>

<version>1.4.0</version>

<packaging>jar</packaging>

The first three values are commonly called GAV. A version ending in -SNAPSHOT (for example, 1.5.0-SNAPSHOT) marks work in progress: Maven checks remote repositories for newer builds of it, whereas a release version is expected never to change once published.

Dependencies are declared with the same coordinates:

<dependency>

 <groupId>org.apache.commons</groupId>

 <artifactId>commons-lang3</artifactId>

 <version>3.14.0</version>

</dependency>

Inside a repository, coordinates become a directory path: dots in the groupId turn into folders, followed by the artifactId and the version. The library above is therefore stored at org/apache/commons/commons-lang3/3.14.0/commons-lang3-3.14.0.jar.

Maven Repository Types

A repository is a location where Maven keeps artifacts and looks them up. According to the Maven documentation, there are exactly two types:

• Local repository: a directory on the machine running Maven, located at ${user.home}/.m2/repository by default. It caches everything downloaded from remote repositories and also stores artifacts you install yourself with mvn install.
• Remote repository: any other repository, reached over a protocol such as https:// or file://. Maven Central (https://repo.maven.apache.org/maven2/) is the default remote repository and needs no configuration. Vendors and companies also run their own, often through a repository manager such as Nexus or Artifactory, which hosts private artifacts and can cache Central.

Many tutorials list Central as a third type, but it is simply the best-known remote repository.

A download is triggered when a declared dependency is missing from the local repository (or, for a SNAPSHOT, when a remote repository holds a newer build). After that, Maven reuses the local copy. You add a remote repository in the POM:

<repositories>

  <repository>

    <id>company-releases</id>

    <url>https://repo.example.com/releases</url>

  </repository>

</repositories>

A separate <pluginRepositories> section does the same job for plugins.

How to Use Maven?

A step-by-step guide to using Apache Maven for managing and building projects successfully.

Installing Maven

• Go to the Apache Maven website and download the latest version of Maven.
• Extract the downloaded archive and send it to a directory on your system.
• Set the M2_HOME environment variable to the directory where you extracted Maven. Also, add the M2_HOME/bin directory to your system's PATH environment variable.
• Open a terminal or command prompt and run the command maven - -version to verify that Maven is installed properly.

Maven Goals and Build Phases

These two terms are among the most commonly confused ideas in Maven.

• A build phase is a named stage in a lifecycle, such as compile or package.
• A goal is a specific task provided by a plugin. Goals do the actual work.

Goals are bound to phases. When Maven runs a phase, it executes every goal bound to it, and a phase with no bound goals does nothing. Running a phase also runs all earlier phases of the same lifecycle. For a standard jar project, the default bindings are:

You can call either a phase or a goal from the command line:

mvn package               # runs every phase up to and including package

mvn compiler:compile      # runs only this goal, no earlier phases

mvn clean package         # clean lifecycle first, then the default lifecycle up to package

Calling a goal directly skips the lifecycle, which is handy for quick tasks but can fail if earlier steps, such as compilation, have not run. When you are unsure which phase to call, the Maven documentation recommends mvn verify, which runs everything up to and including integration-test checks.

Maven Plugin Goals

Plugins do almost all of Maven's work, and each plugin offers one or more goals. A goal is written as pluginPrefix:goalName. Official plugins are named maven-<prefix>-plugin, so maven-dependency-plugin has the prefix "dependency". Goals you will use often:

You can also attach a goal to a phase yourself. This example builds a sources JAR during the package phase:

<plugin>

  <groupId>org.apache.maven.plugins</groupId>

  <artifactId>maven-source-plugin</artifactId>

  <version>3.3.1</version>

  <executions>

    <execution>

      <id>attach-sources</id>

      <phase>package</phase>

      <goals>

        <goal>jar-no-fork</goal>

      </goals>

    </execution>

  </executions>

</plugin>

Always declare plugin versions explicitly so builds stay repeatable across machines.

Procedures/Processes involved in Developing the Maven Project:

Creating a Maven Project

• Create a new directory for your project.
• Create a new file named pom.xml in the project directory. This file will contain the project’s metadata and build settings.
• Add the required XML code to the pom.xml to define the project’s coordinates.
• Add dependencies to the pom.xml file using <dependencies> element.

Additional Maven Standard Directories

Besides src/main/java and src/test/java, Maven's standard layout defines other locations. Following them lets plugins work without extra configuration.

Everything in target is generated, so keep it out of version control. It is safe to delete, and mvn clean does exactly that.

Maven Settings and settings.xml

The POM describes a project, while settings.xml describes your own environment: credentials, proxies, and mirrors that should not travel with the source code. Maven reads two files, a global one (conf/settings.xml in the Maven installation) and a user one (~/.m2/settings.xml), and the user file takes precedence.

<settings>

  <servers>

    <server>

      <id>company-releases</id>

      <username>build-user</username>

      <password>${env.REPO_PASSWORD}</password>

    </server>

  </servers>

  <mirrors>

    <mirror>

      <id>internal-mirror</id>

      <mirrorOf>*</mirrorOf>

      <url>https://repo.example.com/maven-public</url>

    </mirror>

  </mirrors>

</settings>

The server id must match the repository id used in the POM. Values in settings.xml can read environment variables with ${env.NAME}, as shown above. Never store plain-text passwords in pom.xml. Maven also offers password encryption through mvn --encrypt-master-password and mvn --encrypt-password.

Maven Build Profiles

A profile is a named block of configuration that changes the build only when it is activated. One POM can therefore serve development, testing, and production without separate files.

<profiles>

  <profile>

    <id>dev</id>

    <activation>

      <activeByDefault>true</activeByDefault>

    </activation>

    <properties>

      <app.env>development</app.env>

    </properties>

  </profile>

  <profile>

    <id>prod</id>

    <properties>

      <app.env>production</app.env>

    </properties>

  </profile>

</profiles>

A profile can be activated in several ways:

• Explicitly: with the -P flag, for example, mvn package -Pprod, or through <activeProfiles> in settings.xml.
• By default: activeByDefault only takes effect when the command line, settings.xml, or another activator have activated no other profile.
• By condition: the JDK version, the operating system, a system property or the presence of a file.

Run mvn help:active-profiles to see which profiles are active. Child POMs do not inherit profiles; they only inherit the effects of the active ones. Use profiles sparingly: if one changes what ends up inside the artifact, two builds of the same commit can differ, which is hard to debug.

Maven Optional Dependencies and Dependency Exclusions

Transitive dependencies are convenient, but sometimes they bring in libraries you do not want. Maven provides two opposite controls.

The library author sets optional dependencies. A dependency marked <optional>true</optional> is used to build that library but is not passed on to projects that depend on it. Anyone who needs the related feature must declare that dependency in their own POM. The Maven documentation describes this as a stop-gap: the cleaner design, where possible, is to move the optional feature into its own module.

<dependency>

  <groupId>com.example</groupId>

  <artifactId>pdf-export-lib</artifactId>

  <version>2.1.0</version>

  <optional>true</optional>

</dependency>

The library consumer sets exclusions. They block a specific transitive dependency, for example, a conflicting logging library, and apply to everything below the dependency where they are declared.

<dependency>

  <groupId>com.example</groupId>

  <artifactId>reporting-lib</artifactId>

  <version>3.0.0</version>

  <exclusions>

    <exclusion>

      <groupId>commons-logging</groupId>

      <artifactId>commons-logging</artifactId>

    </exclusion>

  </exclusions>

</dependency>

Since Maven 3.2.1, wildcards are allowed in exclusions, so * can stand in for the groupId, the artifactId, or both. Before excluding anything, run mvn dependency:tree to find where the unwanted artifact comes from, and test afterwards, because the library may still need it at runtime.

Working with the Maven tool:

It features many components that interact with each other to assist users in developing the projects. A command is put into the command line at first.

The pom.xml file would be examined by the install command to learn about the project and its build specifications. The sections of the data that it reads include the project's details, and this is where we would discover a way of searching for the Artifacts that the build would also form.

Additionally, the requirements and plugins will be examined. Plugins are required to create the Artifact since they modify the code, while dependencies are project libraries.

Maven's dependency management facilitates the acquisition of plugins and dependencies. Dependency management works this way: First, pom files are examined for plugins and dependencies, and then specific repositories are accessed.

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What is Maven in DevOps?

Maven is a well-known open-source tool created to simultaneously build, manage, and deploy multiple projects for improved project management. It has a development process comparable to that of ANT. However, it is more innovative than ANT. SCMs builds, and documentation is all taken care of by Maven, as also the distribution of releases. Maven loads packages from Maven Central.

Learn More About DevOps Roadmap

It makes the process of developing a project easier by giving a consistent approach to the process of developing and maintaining a project. So, it's needed in many different fields, and as we've already seen, Maven is used by employees everywhere, from software applications to IT.

Maven Project Inheritance and Aggregation

Maven has two separate mechanisms for organizing related projects. They are often used together, but they solve different problems.

Maven POM Inheritance

A child POM reuses configuration from a parent POM, which uses pom packaging. The child inherits items such as dependencies, dependencyManagement, plugin configuration and properties, and it can omit its own groupId and version. It still declares its own artifactId.

<parent>

  <groupId>com.example.shop</groupId>

  <artifactId>shop-parent</artifactId>

  <version>1.0.0</version>

  <relativePath>../pom.xml</relativePath>

</parent>

<artifactId>order-service</artifactId>

Keeping versions and plugin settings in the parent keeps all children consistent.

Maven Project Aggregation

Aggregation builds several projects with one command. An aggregator POM has pom packaging and lists its modules, each given as the path to the module's directory.

<packaging>pom</packaging>

<modules>

  <module>order-service</module>

  <module>payment-service</module>

</modules>

Running mvn package in the aggregator builds every listed module.

Inheritance vs Aggregation in Maven

The two work independently: a parent does not have to aggregate, and an aggregator does not have to be a parent. Most teams combine both in one POM, which gives the multi-module setup described below.

What Is the Maven Super POM?

Every POM implicitly inherits from the Super POM, a default POM built into Maven. It supplies the defaults you never write yourself, such as the Central repository definition and the standard directories, which is why a very small POM can already build a project. To see the combined result of the Super POM, parent POMs and active profiles, run:

mvn help:effective-pom

Case Studies of Maven

Case 1: 3D printing consultant  (A new dimension) 

Challenge:

A pioneering manufacturing company renowned for its cutting-edge 3D printing technology has achieved significant success with its high-end 3D printing. However, having exhausted growth opportunities within its existing customer base, the company sought to expand into new industries. To inform this strategic move, the market development team wanted to investigate potential new applications for their additive manufacturing product, exploring fresh avenues for growth and innovation.

Solution with Maven:

The company leveraged Maven’s Electronic Survey to identify new users for their 3D printing product, generating valuable strategies to target these opportunities; the team was able to drive revenue growth from their 3D printing offerings. Maven’s insights effectively bridged the gap between the company’s current market saturation and future growth potential, enabling a successful expansion into new areas.

Case 2: Tiny Transporters

Challenge:

A biomedical materials company’s application engineering team was weighing an investment in a new product line that could potentially utilise lipid nanoparticles, a rapidly emerging technology gaining traction in the pharmaceutical industry. Despite conducting extensive research, reviewing literature, and tapping into academic networks, the team remained uncertain about the technology’s suitability for their specific application. Seeking clarity on how to move forward, they turned to Maven for expert guidance.

Solution with Maven:

Maven connected the biomedical materials company with a network of experts in lipid nanoparticles from the biotech pharma, and drug delivery sectors. Through in-depth consultations with these specialists, the company gained a profound understanding of the current nanoparticle technology landscape and received invaluable feedback on its product development strategy. Armed with these actionable insights, the team accelerated their project timeline, positioning the new product line for launch significantly ahead of initial projections.

Maven Multi-Module Projects

A multi-module project splits an application into smaller Maven projects that are built together. A typical layout looks like this:

shop-parent/

├── pom.xml            (packaging: pom, lists the modules)

├── shop-common/

│   └── pom.xml

├── order-service/

│   └── pom.xml

└── payment-service/

    └── pom.xml

Modules can depend on one another, typically using the shared project version:

<dependency>

  <groupId>com.example.shop</groupId>

  <artifactId>shop-common</artifactId>

  <version>${project.version}</version>

</dependency>

Maven's reactor reads all the module POMs, works out how they depend on each other and builds them in the right order, whatever order the <modules> list uses. These options help when working with modules:

Manage shared dependency versions once, in the parent's dependencyManagement, and keep each module focused on a single responsibility.

Maven's Three Built-in Lifecycles

Maven has three built-in lifecycles: default, clean and site. Each is an ordered list of phases, and they run independently of one another. The phases below are those of Maven 3.x. Maven 4 is still at release-candidate stage at the time of writing and restructures the lifecycle internally, so check the current documentation before describing it.

Default Lifecycle

The default lifecycle builds and delivers the project. It has 23 phases, run in this order:

validate, initialize, generate-sources, process-sources,

generate-resources, process-resources, compile, process-classes,

generate-test-sources, process-test-sources, generate-test-resources,

process-test-resources, test-compile, process-test-classes, test,

prepare-package, package, pre-integration-test, integration-test,

post-integration-test, verify, install, deploy

Unit tests run in test, integration tests in integration-test with their result checks in verify, install copies the package to the local repository, and deploy copies it to a remote one. Phases with hyphenated names such as pre-, post- and process-* are not normally called directly. In particular, call verify rather than integration-test, so that any test environment is shut down properly.

Clean Lifecycle

The clean lifecycle removes the output of earlier builds. It has three phases: pre-clean, clean and post-clean. The clean phase runs the clean:clean goal, which deletes the target directory.

Site Lifecycle

The site lifecycle creates project documentation and reports. Its four phases are pre-site, site, post-site and site-deploy. By default, site runs site:site and site-deploy runs site:deploy.

Maven Site Generation

The maven-site-plugin turns project information into a browsable website:

mvn site

The result is written to target/site, and you can open index.html in a browser. The site brings together:

• Project information reports drawn from the POM, such as dependencies, licenses and team members.
• Build reports configured in the <reporting> section, for example test results, Javadoc or Checkstyle.
• Hand-written pages placed in src/site, with the navigation menu defined in site.xml.

<reporting>

  <plugins>

    <plugin>

      <groupId>org.apache.maven.plugins</groupId>

      <artifactId>maven-project-info-reports-plugin</artifactId>

    </plugin>

  </plugins>

</reporting>

Use mvn site:run for a local preview and mvn site:deploy to publish the site to the location configured in distributionManagement. Site generation is most useful for internal libraries, where teams want current documentation and reports in one place.

Benefits of Maven

Here are some of its benefits about it.

• Simplifies the planning process of any specific project.
• It ensures consistency throughout the entire design process.
• Understanding the project is crucial. It provides exhaustive details regarding the work.
• Developing a program to the highest standard is essential to ensuring its quality, giving the required standards for doing so.
• It is often essential to bring new features to research work, making the process easier.

Also Read: How To Learn DevOps

Companies Using Maven

Apache Maven is a widely adopted build automation tool used by various companies across industries:

• Google: Google uses Maven to build and manage many of its open-source projects, including Android and Google Web Toolkit.
• Microsoft: Microsoft also uses Maven for open-source projects like Azure, SDKs, and Visual Studio Code.
• Amazon: Amazon Web Services (AWS) uses Maven to build and deploy its cloud-based services, including AWS Lambda and AWS Elastic Beanstalk.
• Oracle: It uses Maven to build and manage many of its software products, including Oracle Database and Java.
• Apache Software Foundation: Maven is used extensively within the Apache Software Foundation to build and manage many open-source projects.

Conclusion

The Maven tool makes it easier for Java developers to create java-based projects. pom.xml is used to set up Maven. This DevOps Training course provides additional information on how DevOps Professionals may use Maven.

You will likely use it frequently in your projects if you are a developer or a programmer. However, to remain competitive in the Maven market and create a more standardised program, it is also vital to have a thorough understanding of the technology.

DevOps course is now an approved credential that displays the competitive skill and expertise needed to be an effective DevOps practitioner. Tests, training programs or performance evaluations show that the individual met rigorous standards. In addition, you will learn how a Developer uses Maven, how a DevOps Engineer uses Maven, how to work on Maven, and how to configure and integrate Maven.

Frequently Asked Questions

1. What are the main Maven commands used in a DevOps workflow?

The core commands are mvn clean, compile, test, package, verify, install and deploy. Pipelines often add options such as -B (batch mode, no prompts), -ntp (hide download progress, available since Maven 3.6.1), -P (choose a profile), -pl with -am (build selected modules) and -DskipTests. A common CI command is mvn -B clean verify.

2. What is the role of Maven in a CI/CD pipeline?

Maven is the build engine. A CI tool such as Jenkins, GitLab CI or GitHub Actions runs it to compile the code, run tests and package the application. On success, mvn deploy can publish the versioned artifact to a repository manager, where later stages, such as building a container image or releasing to an environment, can pick it up. Maven does not schedule or trigger builds itself; the CI tool does.

3. Where does Maven store downloaded dependencies locally?

In the local repository, which defaults to ${user.home}/.m2/repository, for example ~/.m2/repository on Linux and macOS or C:\Users&lt;username>.m2\repository on Windows. Files are organized by groupId, artifactId and version. You can move it with the localRepository setting in settings.xml or the -Dmaven.repo.local option. Caching this folder between CI runs makes builds much faster.

4. What happens when a Maven build fails?

Maven stops at the failing goal, prints BUILD FAILURE with the plugin goal and the error message, and exits with a non-zero code, which is what makes a CI job fail. In a multi-module build, the reactor summary shows which modules succeeded, failed or were skipped. You can change the behavior with --fail-at-end (keep building modules that do not depend on the failed one) or --fail-never, and continue a build later with -rf.

5. How does Maven help automate software testing?

Testing is part of the lifecycle. The Surefire plugin runs unit tests during the test phase and is bound by default. Integration tests are run by the Failsafe plugin, which you add to the POM yourself; it runs during integration-test and checks the results during verify. Failsafe looks for class names such as *IT.java by default, while Surefire looks for names such as *Test.java. A failing test fails the build, and reports are written under target, for example in target/surefire-reports. Use -Dtest=ClassName to run a single test class.

6. How can Maven builds be triggered automatically?

Maven does not watch for changes, so a CI tool starts it. Common triggers are a push or pull request (through a repository webhook), a schedule, or the completion of another job. The pipeline step simply runs a command such as mvn -B verify.

7. How does Maven handle failed or unavailable dependencies?

Maven checks the local repository first, then the configured remote repositories or mirrors. If none of them has the artifact, the build stops with a "Could not resolve dependencies" error. Maven may remember a failed lookup, so after fixing the cause, such as a wrong coordinate, repository URL, credentials or proxy, run the build again with -U to force a fresh check. Offline mode (-o) uses only what is already in the local repository, and a repository manager that caches Central protects you when an outside server is down.

8. How can Maven build logs help troubleshoot errors?

Start with the first [ERROR] line, which names the failing plugin goal and the project. Add -e to see full stack traces or -X for debug output, including classpaths and dependency resolution details. In a multi-module build, the reactor summary at the end shows where the build broke. For test failures, open the reports in target/surefire-reports. You can also write the output to a file with -l build.log.

9. Can Maven builds be executed on different operating systems?

Yes. Maven is written in Java, so it runs on Windows, Linux and macOS wherever a suitable JDK is installed. Use mvn on Unix-like systems and mvn.cmd on Windows. To avoid cross-platform surprises, set project.build.sourceEncoding explicitly, avoid hard-coded file paths, and use the Maven Wrapper (mvnw and mvnw.cmd) so that everyone builds with the same Maven version.

10. How can Maven improve the reliability of application builds?

Pin dependency and plugin versions and manage them centrally with dependencyManagement. Use the Maven Enforcer plugin to require minimum Java and Maven versions and to catch dependency problems. Let tests run inside the lifecycle so broken code never reaches packaging, and build with mvn clean verify in CI, since Maven's own documentation recommends verify when you are unsure which phase to call. Finally, use a shared repository manager so that every build receives identical artifacts.