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Pom.xml

lastmod 2025-02-14created 2024-11-0410 edits

That thing used in maven projects.

Properties

  • modelVersion - POM model version
  • groupId - The unique identifier of the project group or organization.
  • artifactId - The name that uniquely identifies the project within the group.
  • name - Project name
  • packaging - Packaging output format
  • version - The current project version. "SNAPSHOT" means a version under development.
  • sourceDirectory - Specifies the source code folder
  • properties - Variable settings. Accessible afterward in the ${...} format.
  • dependencies - List of dependency packages
  • plugins - Defines the plugins to use in the Maven build process.

Properties

  • project.basedir - The directory where the current project is. Corresponds to the location of the pom.xml file.
  • project.build.directory - The directory containing all files generated by the build. The default is "target".

Sample example 

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

    <modelVersion>4.0.0</modelVersion>
    <groupId>com.project</groupId>
    <artifactId>firebell</artifactId>
    <name>FirebellRest</name>
    <packaging>war</packaging>
    <version>1.0.0-BUILD-SNAPSHOT</version>

    <properties>
        <java-version>1.6</java-version>
        <org.springframework-version>3.1.1.RELEASE</org.springframework-version>
        <org.aspectj-version>1.6.10</org.aspectj-version>
        <org.slf4j-version>1.6.6</org.slf4j-version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${org.springframework-version}</version>
            <exclusions>
                <!-- Exclude Commons Logging in favor of SLF4j -->
                <exclusion>
                    <groupId>commons-logging</groupId>
                    <artifactId>commons-logging</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <!-- More dependency -->

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <artifactId>maven-eclipse-plugin</artifactId>
                <version>2.9</version>
                <configuration>
                    <additionalProjectnatures>
                        <projectnature>org.springframework.ide.eclipse.core.springnature</projectnature>
                    </additionalProjectnatures>
                    <additionalBuildcommands>
                        <buildcommand>org.springframework.ide.eclipse.core.springbuilder</buildcommand>
                    </additionalBuildcommands>
                    <downloadSources>true</downloadSources>
                    <downloadJavadocs>true</downloadJavadocs>
                </configuration>
            </plugin>

            <!-- More Plugin -->

        </plugins>
    </build>
</project>

build

This section configures Maven's build process. Explained with the following example: 

    <build>
        <sourceDirectory>src</sourceDirectory>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.7.0</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
sourceDirectory
Specifies the src directory as the base directory for source code.
Maven normally uses src/main/java as the source directory by default. This appears to be specified to change it to src when needed.
plugins
A section listing the plugins to use in the Maven build process.
plugin
A block that defines an individual plugin.
Here maven-compiler-plugin is used. This plugin is used to compile source code.
artifactId
Specifies the name of the Maven plugin. Here it is maven-compiler-plugin.
version
Specifies the version of the plugin to use. In this case, version 3.7.0 is used.
configuration
Defines additional settings to pass to the plugin.
  • source - Specifies the version of the Java source code. Java 1.8 is used here.
  • target - Specifies the target JVM version for the compiled class files. Java 1.8 is used here as well.

dependencyManagement

Maven's dependencyManagement is a tag that lets you centrally manage the versions and scopes of dependencies in a project. When multiple modules or subprojects use the same dependency, it keeps versions consistent and prevents conflicts.

  • Centralized dependency management - Define dependency versions and scopes in the parent POM, and child projects don't need to specify the version when referencing that dependency. Enables consistent version management.
  • Not a dependency declaration - Dependencies declared in dependencyManagement are not automatically added to the project. To use them, each project must explicitly add them to dependencies.
  • Used in hierarchies - Mainly used in a parent POM to manage dependencies commonly applied to child projects.

Adding a specific local JAR file as a dependency

Use systemPath. 

  <dependency>
    <groupId>com.example</groupId>
    <artifactId>mseo-common</artifactId>
    <version>1.0.0</version>
    <scope>system</scope>
    <systemPath>${project.basedir}/lib/mseo-common_1.0.0.jar</systemPath>
  </dependency>

See also

author Zer0 sitemap