Creating a Maven multi-module project

Category : Microservices | Sub Category : Microservices | By Prasad Bonam Last updated: 2023-11-27 10:21:28 Viewed : 218

Creating a Maven multi-module project for microservices involves organizing your codebase into multiple modules, where each module represents a separate microservice. This structure allows for better separation of concerns and scalability. Below is a step-by-step guide to creating a Maven multi-module project for microservices.

Project Structure:

luaCopy code
my-microservices-project
|-- parent (pom.xml)
|-- user-service (pom.xml)
|   `-- src
|       `-- main
|           `-- java
|               `-- com.example.userservice
|-- order-service (pom.xml)
|   `-- src
|       `-- main
|           `-- java
|               `-- com.example.orderservice
|-- shared-library (pom.xml)
|   `-- src
|       `-- main
|           `-- java
|               `-- com.example.shared

Step-by-Step Guide:

1. Create the Parent Project:

Create a new directory for your project, and inside it, create a parent directory. In the parent directory, create a pom.xml file.

parent/pom.xml:

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<project xmlns="http://www.w3.org/2001/XMLSchema-instance"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
                             http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.example</groupId>
    <artifactId>my-microservices-project</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <packaging>pom</packaging>

    <modules>
        <module>user-service</module>
        <module>order-service</module>
        <module>shared-library</module>
    </modules>

    <properties>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>
</project>

2. Create Microservices Modules:

Create individual modules for each microservice (user-service and order-service) and a shared library module (shared-library). Each module should have its own pom.xml file.

user-service/pom.xml:

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<project>
    <parent>
        <groupId>com.example</groupId>
        <artifactId>my-microservices-project</artifactId>
        <version>1.0.0-SNAPSHOT</version>
    </parent>

    <modelVersion>4.0.0</modelVersion>
    <artifactId>user-service</artifactId>

    <!-- Add dependencies, plugins, etc. specific to the user-service module -->
</project>

order-service/pom.xml:

xmlCopy code
<project>
    <parent>
        <groupId>com.example</groupId>
        <artifactId>my-microservices-project</artifactId>
        <version>1.0.0-SNAPSHOT</version>
    </parent>

    <modelVersion>4.0.0</modelVersion>
    <artifactId>order-service</artifactId>

    <!-- Add dependencies, plugins, etc. specific to the order-service module -->
</project>

shared-library/pom.xml:

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<project>
    <parent>
        <groupId>com.example</groupId>
        <artifactId>my-microservices-project</artifactId>
        <version>1.0.0-SNAPSHOT</version>
    </parent>

    <modelVersion>4.0.0</modelVersion>
    <artifactId>shared-library</artifactId>

    <!-- Add dependencies, plugins, etc. shared by multiple modules -->
</project>

3. Implement Microservices:

Inside each microservice module (user-service and order-service), you can implement the microservice logic, including controllers, services, and any other necessary components.

4. Use Shared Library:

If there are common classes, utilities, or configurations shared between the microservices, you can place them in the shared-library module. This allows for reuse and consistency across services.

Building and Running:

To build the entire project, go to the root directory (my-microservices-project) and run:

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mvn clean install

This command will build all the modules in the correct order, resolving dependencies between them.

Notes:

• The parent POM file specifies the common configurations and manages the versioning of the microservices.
• Each microservice module is independent and can be developed, tested, and deployed separately.
• Dependencies between modules are managed automatically by Maven.
• This structure allows for better modularity, maintainability, and scalability in a microservices architecture.

This example provides a basic structure for a Maven multi-module project for microservices. In a real-world scenario, you would expand on this structure based on the specific requirements of your microservices architecture.