A Maven module is a sub-project. To create a Maven module you will need to already have a Maven project available. The parent project must have its Packaging option pre-configured to pom, for a module to be created and associated with it.

WHAT IS modules in POM?

A multi-module project is built from an aggregator POM that manages a group of submodules. In most cases, the aggregator is located in the project’s root directory and must have packaging of type pom. The submodules are regular Maven projects, and they can be built separately or through the aggregator POM.

What is the difference between Maven project and Maven module?

a maven module is like a maven “sub-project”. a maven project includes 1 or more modules. more info here. Typically, a module generates a single artifact (jar, war, zip, etc), although this is not always true.

How do I name a Maven module?

First of all, the most important things is that you are consistent. General Maven convention uses ‘-‘ as the separator ( commons-lang , maven-model ). If you intend for it to be used externally, remember the module = artifact ID = filename (in best practice), so it needs to be recognisable ( maven-model-2.0.

How do I run a specific module in Maven?


  1. maven: Specify submodules.
  2. Maven and dependent modules.
  3. Define modules list which shall be built in Maven multiproject build.
  4. FlinkMLTools NoClassDef when running jar built with maven.
  5. Maven, build a submodule separately.

What is reactor in Maven?

The reactor is the part of Maven that allows it to execute a goal on a set of modules. As mentioned in the Maven 1. x documentation on multi-modules builds (the reactor concept was already there in Maven 1.

What is archetype in Maven?

In short, Archetype is a Maven project templating toolkit. An archetype is defined as an original pattern or model from which all other things of the same kind are made. The name fits as we are trying to provide a system that provides a consistent means of generating Maven projects.

What is the difference between project and module?

A project can contain one or more related modules. Each module is a separate library, application and can be a jar, ear or war. Also modules aren’t just Java either. You can have modules for ruby, scala, or something else as well.

What is module info in Java?


java file. It declares the dependencies within the module system and allows the compiler and the runtime to police the boundaries/access violations between the modules in your application.

Can we have multiple POM files?

Yes you can use Maven Profiles to manage this.

What is parent POM and child POM?

A parent pom. xml file (or super POM) in Maven is used to structure the project in order to avoid redundancies and duplicate configurations by using an inheritance between different pom. xml files. If any dependency or properties are configured in both – parent and child – pom.

What does POM stand for Maven?

Project Object Model

A Project Object Model or POM is the fundamental unit of work in Maven. It is an XML file that contains information about the project and configuration details used by Maven to build the project. It contains default values for most projects.

What is a Maven repository?

A repository in Maven holds build artifacts and dependencies of varying types. There are exactly two types of repositories: local and remote: the local repository is a directory on the computer where Maven runs. It caches remote downloads and contains temporary build artifacts that you have not yet released.

What is artifacts in Maven?

In Maven terminology, an artifact is an output generated after a Maven project build. It can be, for example, a jar, war, or any other executable file. Also, Maven artifacts include five key elements, groupId, artifactId, version, packaging, and classifier.

How .m2 folder is created?

m2 folder will not be present in C:\Users\ {user} path. To generate the folder you have to run any maven command e.g. mvn clean, mvn install etc. so that it searches for settings. xml in .

What is dependencies in Maven?

What is Maven Dependency? In Maven, a dependency is just another archive—JAR, ZIP, and so on—which our current project needs in order to compile, build, test, and/or run. These project dependencies are collectively specified in the pom. xml file, inside of a <dependencies> tag.

What are the 3 types of dependencies?

Types of dependencies in project management

  • Logical dependencies. Also known as causal dependencies. …
  • Resource dependencies. This dependency originates from a project constraint as it deals with the availability of shared resources. …
  • Preferential dependencies. …
  • External dependencies. …
  • Cross-team dependencies.

What are plugins in Maven?

Plugins are the central feature of Maven that allow for the reuse of common build logic across multiple projects. They do this by executing an “action” (i.e. creating a WAR file or compiling unit tests) in the context of a project’s description – the Project Object Model (POM).

What is bom in Maven?

What Is Maven BOM? BOM stands for Bill Of Materials. A BOM is a special kind of POM that is used to control the versions of a project’s dependencies and provide a central place to define and update those versions.

What is a BOM and pom?

BOM stands for Bill Of Materials. Maven lets us define the versions of the dependencies or transitive dependencies in a separate POM. A BOM package is a POM only jar file that is used to control the versions of a project’s dependencies and provide a central place to define and update those versions.

What is the Maven lifecycle?

Maven Lifecycle: Below is a representation of the default Maven lifecycle and its 8 steps: Validate, Compile, Test, Package, Integration test, Verify, Install and Deploy.

What is scope runtime in POM XML?

runtime. This scope indicates that the dependency is not required for compilation, but is for execution. It is in the runtime and test classpaths, but not the compile classpath.

What is classpath in Maven?

The reported classpath consists of references to JAR files cached in local Maven repository. Even the JAR artifact of the project is referenced from local Maven cache and not from the /target directory one or the other might expect.

What is compile dependency?

Compile dependencies are available in all classpaths of a project. Furthermore, those dependencies are propagated to dependent projects. provided This is much like compile, but indicates you expect the JDK or a container to provide the dependency at runtime.

What is compile time dependency?

A dependency that can be resolved at compile time is a compile-time dependency. A dependency that cannot be resolved until runtime is a runtime dependency. Compile-time dependencies tend to be easier for developers to see than runtime dependencies, but sometimes runtime dependencies can be more flexible.

What is the use of scope in Maven dependency?

Dependency scope is used to limit the transitivity of a dependency and to determine when a dependency is included in a classpath. This is the default scope, used if none is specified. Compile dependencies are available in all classpaths of a project. Furthermore, those dependencies are propagated to dependent projects.

What is runtime jar?

A runtime dependency is an existing JAR file needed by your plug-in at execution. A runtime may need to be added to a plug-in for use by : Model Class: A model class may have imports from several external JAR files. Artifact Filter: A filter class may have imports from several external JAR files.