moai-lang-java

SOLID principles and GoF design patterns guide Java architecture by enforcing separation of concerns, reducing coupling, and improving maintainability. This Skill codifies enterprise patterns like dependency injection, factories, and adapters to structure complex applications—from microservices to Android—around proven object-oriented design.

Yes. Spring's DI container wires components for loose coupling; REST controllers expose endpoints, and JUnit with Mockito isolate units for testing. This Skill covers Spring patterns for REST services, JPA database access, and testing strategies that satisfy enterprise integration and testability requirements.

Structure around layers—controllers for HTTP, services for logic, repositories for data—applying SOLID principles to avoid tight coupling. This Skill provides architectural guidance for Spring-based microservices, including AOP for cross-cutting concerns, REST endpoint design, and build automation with Maven or Gradle.

Isolate units using Mockito to stub external dependencies, then write assertions with JUnit. This Skill teaches testing patterns for Spring beans, REST controllers, and service layers, ensuring your enterprise Java code remains verifiable and maintainable across refactors.

Yes. Spring Data JPA abstracts Hibernate ORM to simplify entity mapping and queries. This Skill covers JPA/Hibernate patterns within Spring applications, including repository patterns, transaction management, and integration with REST services for complete data-to-API pipelines.

Composition over inheritance reduces fragility and improves flexibility. This Skill addresses SOLID violations and GoF alternatives—like decorators, strategies, and mixins—to handle design complexity without deep hierarchies, especially critical in enterprise systems where change is frequent.