Agent Skills: Java

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)