Maven built-in implicit variables

MAVEN provides three implicit variables that can be used to access environment variables, POM information, and maven Settings

Env

Env variable that exposes the environment variables of your operating system or shell. Like a pair of ${env in Maven Pom. The reference to PATH} will be replaced by the ${path} environment variable, which is%path% in Windows.

projetc

The project variable exposes the POM. You can use dot markers (.) The path to reference the value of the POM element. For example

<project>
<modelVersion>4.0.0</modelVersion>
<groupId>org.sonatype.mavenbook</groupId>
<artifactId>project-a</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<build>
<finalName>${project.groupId}-${project.artifactId}</finalName>
</build>
</project>

When you use MVN help:effective-pom view, you will see <finalName>org.sonatype.mavenbook-project-a</finalName>

${BASEDIR} project root directory ${project.build.directory} build directory, default to target ${project.build.outputdirectory} build process output directory, default to target/ Classes ${project.build.finalname} Output name, default is ${project.artifactid}-${project.version} ${project.packaging} package Type, The default is Jar ${project.xxx} The contents of any node of the current Pom file

Settings

The settings variable exposes MAVEN settings information. You can use dot markers (.) The path to reference the value of the element in the settings.xml file. For example, ${settings.offline} references the value of the offline element in the ~/.m2/settings.xml file.