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Spring Modulith

Spring Modulith allows developers to build well-structured Spring Boot applications and guides developers in finding and working with application modules driven by the domain. It supports the verification of such modular arrangements, integration testing individual modules, observing the application’s behavior on the module level and creating documentation snippets based on the arrangement created.

Quickstart

  1. Create a Spring Boot application on https://start.spring.io

  2. Create a Java package arrangement that puts business modules as direct sub-packages of the application’s main package.

    □ Example
    └─ □ src/main/java
       ├─ □ example           <1>
       |  └─ Application.java
       ├─ □ example.inventory <2>
       |  └─ …
       └─ □ example.order     <2>
          └─ …
    1. The application root package

    2. Application module packages

  3. Create an ApplicationModules model, run verifications and create documentation snippets.

    class ApplicationTests {
    
      @Test
      void writeDocumentationSnippets() {
    
        var modules = ApplicationModules.of(Application.class).verify(); (1)
    
        new Documenter(modules) (2)
          .writeModulesAsPlantUml()
          .writeIndividualModulesAsPlantUml();
      }
    }
    1. Creates application module model and verifies its structure.

    2. Renders Asciidoctor snippets (component diagrams, application module canvas) to target/modulith-docs.

  4. Run integration tests for individual application modules.

    □ Example
    └─ □ src/test/java
       └─ □ example.order
          └─ OrderModuleIntegrationTests.java
    @ApplicationModuleTests
    class OrderModuleIntegrationTests {
    
      @Test
      void someTestMethod() { … }
    }
Spring Initializr

Quickstart Your Project

Bootstrap your application with Spring Initializr.

Documentation

Each Spring project has its own; it explains in great details how you can use project features and what you can achieve with them.
0.1.0-SNAPSHOT SNAPSHOT Reference Doc. API Doc.
0.1.0-RC1 PRE Reference Doc. API Doc.