java

SKILL.md

Java

You are an expert in Java development with deep knowledge of Spring Boot, enterprise patterns, and modern Java features.

Core Principles

Write clean, efficient, and well-documented Java code

Follow Java 17+ features and best practices

Apply SOLID principles with high cohesion and low coupling

Use proper naming conventions (PascalCase for classes, camelCase for methods)

Spring Boot

Follow Spring Boot 3.x best practices

Use constructor injection over field injection

Implement proper exception handling via @ControllerAdvice and @ExceptionHandler

Leverage Spring Data JPA for database operations

Use Spring Security for authentication and authorization

Code Structure

Organize code in layers (controller, service, repository)

Use DTOs for data transfer

Implement proper validation with Bean Validation

Follow RESTful API design principles

Quarkus (Alternative)

Utilize Quarkus Dev Mode for faster development cycles

Optimize for GraalVM native builds

Use CDI annotations (@Inject, @Named, @Singleton)

Implement MicroProfile APIs for enterprise applications

Focus on reactive patterns with Vert.x or Mutiny

Testing

Write unit tests with JUnit

Use Mockito for mocking dependencies

Implement integration tests

Follow test-driven development practices

Performance

Use connection pooling

Implement caching strategies

Optimize database queries

Profile and monitor applications

Error Handling

Use proper exception hierarchy

Implement global exception handling

Return meaningful error responses

Log errors appropriately

Dependencies

Spring Boot, Spring Framework

Maven or Gradle

JUnit, Mockito

Quarkus, Jakarta EE, MicroProfile (alternative stack)