How to Add a JAR Dependency via Relative Path in Maven?

Adding a Dependency to a Jar by Relative Path in Maven

Problem:

You want to add a proprietary jar as a dependency to a Maven project, but without adding it to a repository or requiring developers to do so manually. Your goal is to reference the jar from a relative path within your project's source control.

Solution:

You can use a "file repository" local to your project and a dependency declaration without the system scope.

Steps:

1. Declare a local repository:

   <repositories>
     <repository>
       <id>my-local-repo</id>
       <url>file://${project.basedir}/my-repo</url>
     </repository>
   </repositories>

2. Install the jar using the install:install-file goal with the localRepositoryPath parameter:

   mvn org.apache.maven.plugins:maven-install-plugin:2.3.1:install-file \
                         -Dfile=<path-to-file> -DgroupId=<myGroup> \
                         -DartifactId=<myArtifactId> -Dversion=<myVersion> \
                         -Dpackaging=<myPackaging> -DlocalRepositoryPath=<path>

3. Declare the dependency in your pom.xml:

   <dependency>
     <groupId>your.group.id</groupId>
     <artifactId>3rdparty</artifactId>
     <version>X.Y.Z</version>
   </dependency>

By using this method, you can add the proprietary jar as a dependency and link to it from a relative path within your project, without relying on a repository or requiring developers to take additional steps.

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