How To Read Maven Dependency Tree

How To Read Maven Dependency Tree






Introduction

How To Read Maven Dependency Tree: The Maven Dependency Tree Command is a feature in the Maven build automation tool that allows developers to view the dependencies of their projects in a hierarchical tree structure. This command displays the direct and transitive dependencies of a project, including their version numbers, scope, and relationships with other dependencies. The output of this command helps developers to better understand their project’s dependencies, identify potential conflicts, and optimize their build process. The Maven Dependency Tree Command is especially useful for large projects with complex dependency relationships. By using this command, developers can ensure that their project’s dependencies are properly managed and aligned with their project goals.

How do I get the Maven dependency tree?

To get the Maven dependency tree of a project, you can use the following command in the terminal or command prompt:

mvn dependency: tree

This command will display the complete tree of dependencies for the project, including all the transitive dependencies. The output will show the groupId, artifactId, and version of each dependency, along with its scope, whether it is a direct or transitive dependency and its relationship with other dependencies.

You can also use additional options with this command to customize the output, such as:

  • Dverbose: Displays more information about each dependency, such as its type, classifier, and optional flag.
  • Dincludes: Filters the dependencies to include only those that match the given criteria. For example, mvn dependency:tree 
  • Dincludes=com.example:* will only show dependencies whose groupId starts with com.example.
  • DoutputFile: Writes the output to a file instead of displaying it in the console. For example, mvn dependency:tree 
  • DoutputFile=tree.txt will write the output to a file named tree.txt.

By analyzing the Maven dependency tree, you can better understand the project’s dependencies and their relationships, which can help you resolve conflicts, optimize the dependencies, and ensure the project’s stability and performance.

What are Maven commands?

Maven is a build automation tool that simplifies the building and management of Java projects. It uses a configuration file called a POM (Project Object Model) to define the project’s dependencies, build settings, and plugins.

Here are some commonly used Maven commands:

  • mvn clean: Deletes the target directory and any other generated files. This is often used before running a build to ensure a clean slate.
  • mvn compile: Compiles the project’s source code.
  • mvn package: Builds the project and packages it into a distributable format, such as a JAR or WAR file.
  • mvn install: Builds the project, packages it, and installs it into the local Maven repository.
  • mvn test: Runs the project’s unit tests.
  • mvn verify: Runs integration tests on the project.
  • mvn site: Generates a project website that includes documentation, reports, and other information.
  • mvn dependency:tree: Displays the project’s dependency tree.
  • mvn help:describe: Provides detailed information about a specific Maven plugin or goal.

These are just a few examples of the many Maven commands available. You can run mvn –help or mvn help:<command> to see a list of all available commands and their usage.

2) Find pom.

xml of your artifact. Find it using maven infrastructure. Go to https://search.maven.org/ and enter your groupId and artifactId. Or you can go to https://repo1.maven.org/maven2/ and navigate first using plugins groupId, later using artifactId and finally using its version.
For multiple dependencies on the same level, – will be shown for the last dependency at that level and +- will be shown for all the other dependencies at that level.
How to get the Maven Dependency Tree of a Project. We can run mvn dependency:tree command in the terminal to print the project dependency tree. For our example, I will be using the Mockito Tutorial project. You can download the project from the GitHub repository.
You can add this below plugin in your pom. xml. Once done, On the Maven window (on the right of IDE), you will find a new plugin called as Dependencies. Expand that and you will see the dependency:tree goal, double click on it and run it, you should see the full dependency tree.

Conclusion

The Maven Dependency Tree Command is an essential tool for Java developers who use Maven as their build automation tool. It allows them to easily visualize the dependencies of their project in a hierarchical tree structure, which is especially useful for large and complex projects. By using this command, developers can quickly identify any potential conflicts or errors in their project’s dependencies, and ensure that they are properly managed and aligned with their project goals. Overall, the Maven Dependency Tree Command is a powerful feature that can help developers save time and effort in managing their projects’ dependencies, and ultimately deliver better software products.

FAQ

How do you analyze a dependency tree in Maven?

For multiple dependencies on the same level, – will be shown for the last dependency at that level and +- will be shown for all the other dependencies at that level.

What is Maven dependency tree?

How to get the Maven Dependency Tree of a Project. We can run mvn dependency:tree command in the terminal to print the project dependency tree. For our example, I will be using the Mockito Tutorial project. You can download the project from the GitHub repository.

How do you identify a dependency tree?

You can add this below plugin in your pom. xml. Once done, On the Maven window (on the right of IDE), you will find a new plugin called as Dependencies. Expand that and you will see the dependency:tree goal, double click on it and run it, you should see the full dependency tree.

How do I run a Maven dependency tree in eclipse?

In your project’s POM, press Ctrl and hover the mouse over the dependency. Click the dependency to open the dependency’s POM. In the dependency POM, view the active dependency, its transitive dependencies and their versions. You can check the origin from which the dependency was pulled in.

Why is POM ignored?

(*) – dependencies omitted (listed previously) Should be displayed under your dependency tree. The dependencies of the marked dependency are omitted for readability because they were already listed higher up in the dependency graph output.

How do you test POM dependency?

Once Maven is installed, you can check the version by running mvn -v from the command-line. If Maven has been installed, you should see something resembling the following output. If you see this output, you know that Maven is available and ready to be used.

What does * mean in dependency tree?

dependency:analyze

It will fork the build and execute test-compile so there are class files to analyze. If you want to bind analyze in your pom, use the dependency:analyze-only instead. This goal can be executed from the command line: mvn dependency:analyze.

How do I tell what version of Maven I have?

Maven Dependency Tree

Transitive dependency means that if A depends on B and B depends on C, then A depends on both B and C. Sometimes, transitivity brings a very serious problem when different versions of the same artifacts are included by different dependencies. It may cause version mismatch issues in runtime.

How do you use dependency analysis?

If you want to see the dependencies both direct and transitive in a dependency tree format, use mvn dependency:tree . This will however not help you with detecting possible version conflicts. For this you need to use the Enforcer Plugin with its built in dependency convergence rule.

What is transitive dependency in Maven?

As others have said, you can use the dependency:analyze goal to find which dependencies are used and declared, used and undeclared, or unused and declared. You may also find dependency:analyze-dep-mgt useful to look for mismatches in your dependencyManagement section.

How does Maven determine transitive dependency?

Use the npm list to show the installed packages in the current project as a dependency tree. Use npm list –depth=n to show the dependency tree with a specified depth. Use npm list –prod to show packages in the dependencies . Use npm list –dev to show packages in the devDependencies .

Where is Maven dependency used?

The dependency plugin provides the capability to manipulate artifacts. It can copy and/or unpack artifacts from local or remote repositories to a specified location.

How does NPM determine dependency tree?

Ignored Files … If you have a multi-module project, IntelliJ IDEA lists all POM files of your project. Selecting the checkbox against a POM file will equal ignoring the project or module in the Maven structure.

How do you run a single unit test in Maven?

Take a look at the IntelliJ docs, particularly the Maven Projects Tool Window. Ignore Project / Unignore Project – Choose the Ignore Projects command to ignore project in build, or, on the contrary, include in build the previously ignored project.

What is the use of Maven dependency plugin?

you can search on the Maven Central Repository Search (https://search.maven.org/) for the full class name with the fc: syntax.

What is ignored Pom?

How do I determine which POM contains missing transitive dependency? Ans. If its already there in Maven local repository, We can add that as a dependency in the project pom file with its Group Id, Artifact Id and version.

How use Maven build in IntelliJ?

In Gradle dependencies are libraries required to build your code. Each of these libraries may have their own dependencies, adding transitive dependencies to your project. This structure is called the Gradle dependency tree, with its own rules on dependency conflict resolution and more.

How unignore POM XML IntelliJ?

A tree-based API for resolution of Maven project dependencies. Component entry point is DependencyGraphBuilder, which will delegate to appropriate implementation for either Maven 2, Maven 3.0. x or Maven 3.1. x.

How do I know if Maven dependency is installed?

The dependency tree in a build scan renders the selection reason (conflict resolution) as well as the origin of a dependency if you click on a dependency and select the “Required By” tab. Every Gradle project provides the task dependencyInsight to render the so-called dependency insight report from the command line.

How do I determine which POM contains missing transitive dependency?

Apache Maven 3.8.4 is the latest release and recommended version for all users.