j5ik2o/java-ddd-example

This is a Java-based Domain-Driven Design example project that models bank account operations, including deposits, withdrawals, and transfers. It is structured as a multi-module Gradle project with separate layers for infrastructure, domain, and application logic. The system provides core financial domain models and utilities for generating unique identifiers.

A new IdGenerator utility class has been added to the infrastructure layer. This component provides a static method, generateId(), which uses an AtomicLong counter to produce sequential, unique Long identifiers. This enables the application to generate simple, monotonically increasing IDs for entities or records.

infrastructure · high confidence

Introduced new domain classes to support bank account functionality. This includes the \BankAccount\ entity with methods for depositing, withdrawing, and transferring funds, along with a \BankAccountService\ to orchestrate transfers between accounts. A \Money\ value object handles currency amounts, and \BankAccountEvent\ tracks the history of changes. Additionally, a \stepbase\ package provides simpler data structures for the same concepts, accompanied by corresponding unit tests for both implementations.

domain · high confidence

The repository is initialized with English and Japanese README files that explain the Domain-Driven Design example, including domain models like Money and BankAccount, and code examples. Additionally, Gradle wrapper scripts (gradlew, gradlew.bat) and a .gitignore file are added to support building the project and managing build artifacts.

(repo-wide) · high confidence

The project now includes a Gradle wrapper configuration file (gradle-wrapper.properties) that specifies the use of Gradle version 3.1. This ensures consistent build environments across different machines by providing the necessary wrapper scripts and properties to download and use the correct Gradle distribution.

gradle · medium confidence

Introduced a new Gradle build structure defining three modules: infrastructure, domain, and application. The build script configures Java 1.8 compatibility and declares dependencies on Lombok, Guava, and Apache Commons Lang, alongside JUnit for testing. The project is organized as a multi-module build where the application module depends on the domain module, which in turn depends on the infrastructure module.

(dependencies) · medium confidence

Written by watchdog.canine.dev from the codebase's own history, inside the signed delivery this page is composed from.

• CAI 54 → 59 (+5.6)
• Rubric changed (rubric-2026.08.19 → rubric-2026.09.15) — scores are not directly comparable.

• Code Health 99 → 100 (+0.2)
• Architecture 69 → 69 (+0.0)
• Maturity 85 → 85 (+0.0)
• Readiness 24 → 36 (+11.7)
• Security 100 → 100 (+0.0)

• Coverage not included — suite not readable by the collector
• Dependency hygiene not measured — dependency manifest found but not parsed for hygiene
• Duplicated block (6 lines × 2) (domain/src/main/java/com/github/j5ik2o/ddd_example/stepbase/BankAccountService.java)
• No exposed public API
• Test reliability not included
• The Domain Models section lists Money, BankAccount, and BankAccountService but does not link to the service implementation (BankAccountService.java) or describe how transfer events are persisted. (README.md)
• early-stage repository — too little history to judge knowledge freshness
• single-maintainer — knowledge-concentration (bus factor) risk

• Dependency hygiene PARTLY measured — Maven/Gradle declarations read, no dependency graph resolved
• Duplicated block (7 lines × 2) (domain/src/main/java/com/github/j5ik2o/ddd_example/stepbase/BankAccountService.java)
• No direct assertions: test (domain/src/test/java/com/github/j5ik2o/ddd_example/domain/BankAccountTest.java)
• No direct assertions: test (domain/src/test/java/com/github/j5ik2o/ddd_example/domain/MoneyTest.java)
• No direct assertions: test (domain/src/test/java/com/github/j5ik2o/ddd_example/stepbase/MoneyTest.java)
• No direct assertions: transfer1 (domain/src/test/java/com/github/j5ik2o/ddd_example/domain/BankAccountServiceTest.java)
• No direct assertions: transferTest1 (domain/src/test/java/com/github/j5ik2o/ddd_example/stepbase/BankAccountServiceTest.java)

Written by watchdog.canine.dev from the codebase's own history, inside the signed delivery this page is composed from.

j5ik2o/java-ddd-example was measured the same way every project in this corpus was: the same rubric, at a pinned commit, with the result published in full. Point a surveyor at a repository you know and see whether you agree with it.