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Maven configuration occurs at differents levels:

• Project - The pom.xml file is the core of a project's configuration in Maven.
• User - this is configuration specific to a particular user: (%USER_HOME%/.m2/settings.xml)
• Global/Installation: (M2_HOME/conf/settings.xml)
  • Maven - Home (m2_home|maven.home)
• Profiles: a descriptor located in project basedir (profiles.xml) (unsupported in Maven 3.0)

Articles Related

Documentation / Reference

• Maven Configuration Mini Guide
• https://maven.apache.org/configure.html