Programmatically retrieve all Maven dependencies

Question

How can I in an very easy way retrieve all direct and transitive dependencies for a given Maven POM in my own Java program?

I aware of the existing questions on Stackoverflow, especially the one using Ivy to resolve the dependencies. I am looking for a solution using Maven, which is able also to resolve the transitive dependencies.

The first question is: For what purpose? Can you explain what is the intention or the problem you are trying to solve? — khmarbaise, Dec 13 '20 at 14:29
I have an Java application, which should analyse the dependency tree of a given POM. The application is part of our release tooling for jQAssistant. — Oliver, Dec 18 '20 at 09:37

score 2 · Answer 1 · answered Dec 13 '20 at 12:09

2

If you need this during a Maven build, you can easily access it in a Maven plugin using project.getDependencies().

If you have a standalone Java program, you can use Maven resolver or the older Aether libraries to do the resolution.

answered Dec 13 '20 at 12:09

J Fabian Meier

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Do you have an working example for using the Maven resolver? – Oliver Dec 18 '20 at 09:41
1

Maybe my old question/answer is a starting point: https://stackoverflow.com/a/48582332/927493 – J Fabian Meier Dec 18 '20 at 10:28

score 0 · Accepted Answer · answered Dec 21 '20 at 14:29

I was now able to solve the problem by using JBoss Shrinkwrap.

Here is a code snipped similar to the one I now use in my tools:

MavenStrategyStage resolve = 
    Maven.configureResolver()
         // do not consult Maven Central or any other repository
         .workOffline()
         // import the configuration of the given settings.xml
         .fromFile(homeDir + "/jqa-release-environment/maven-settings.xml")
         // load the POM you would like to analyse
         .loadPomFromFile(pomFile)
         .importCompileAndRuntimeDependencies()
         .importRuntimeAndTestDependencies()
         .resolve();

MavenWorkingSession mavenWorkingSession = 
    ((MavenWorkingSessionContainer) resolve).getMavenWorkingSession();

List<MavenDependency> dependencies = new ArrayList<>();
dependencies.addAll(mavenWorkingSession.getDependenciesForResolution());
dependencies.addAll(mavenWorkingSession.getDependencyManagement());

To be able to use Shrinkwrap, I added the following dependencies to my POM.

<dependency>
    <groupId>org.jboss.shrinkwrap.resolver</groupId>
    <artifactId>shrinkwrap-resolver-depchain</artifactId>
    <type>pom</type>
    <version>3.1.4</version>
</dependency>
<dependency>
    <groupId>org.jboss.shrinkwrap.resolver</groupId>
    <artifactId>shrinkwrap-resolver-impl-maven</artifactId>
    <version>3.1.4</version>
</dependency>
<dependency>
    <groupId>org.jboss.shrinkwrap.resolver</groupId>
    <artifactId>shrinkwrap-resolver-api-maven</artifactId>
    <version>3.1.4</version>
</dependency>

Programmatically retrieve all Maven dependencies

2 Answers2