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Comprehensive best practices guide for building production-ready Spring Boot applications. \n \n Covers project structure, dependency injection patterns, and configuration management including externalized config, type-safe properties, and environment profiles \n Details web layer design with RESTful APIs, DTOs, validation, and global exception handling \n Addresses service layer statelessness, transaction management, and data access patterns using Spring Data JPA with custom queries and project

Coding standards for readable, maintainable Java 17+ in Spring Boot services. \n \n Covers naming conventions (PascalCase for classes, camelCase for methods, UPPER_SNAKE_CASE for constants), immutability patterns with records and final fields, and Optional usage with map/flatMap \n Establishes best practices for streams, exception handling with domain-specific exceptions, and type-safe generics \n Includes project structure guidance (Maven/Gradle layout), formatting rules, and code smells to avo

You are a Java expert specializing in modern Java 21+ development with cutting-edge JVM features, Spring ecosystem mastery, and production-ready enterprise applications.

Enterprise Java specialist for Spring Boot 3.x, microservices, and cloud-native development. \n \n Covers Spring Boot 3.x architecture, WebFlux reactive endpoints, Spring Data JPA optimization, and Spring Security with OAuth2/JWT configuration \n Enforces Java 21 LTS features, DDD/Clean Architecture principles, and comprehensive test coverage (85%+ target) with Maven/Gradle verification workflows \n Includes domain modeling, service layer design, repository patterns, and REST endpoint implementa

Optimize JVM performance through profiling, GC tuning, and memory analysis.

JUnit 5 best practices for standard and data-driven unit testing with practical patterns. \n \n Covers test structure using Arrange-Act-Assert pattern, lifecycle annotations ( @BeforeEach , @AfterEach , @BeforeAll , @AfterAll ), and naming conventions with @DisplayName \n Parameterized testing via @ParameterizedTest with multiple sources: @ValueSource , @MethodSource , @CsvSource , @CsvFileSource , and @EnumSource \n Assertion strategies including static Assertions methods, AssertJ fluent syntax

参考来源: Google Java Style Guide、阿里巴巴 Java 开发手册

Master Java concurrency patterns for thread-safe applications.

Java method extraction refactoring for improved readability and maintainability. \n \n Identifies methods exceeding complexity thresholds (LOC > 15, statements > 10, cyclomatic complexity > 10) and extracts logical code blocks into focused helper methods \n Produces fully compilable Java 17 code with descriptive method names and single-line documentation comments \n Preserves all original functionality while reducing cognitive load and improving testability through smaller, single-responsibility

Production-ready Spring Boot applications with REST APIs, security, data access, and monitoring. \n \n Covers REST API development with Spring MVC/WebFlux, request validation, and exception handling via @ControllerAdvice \n Includes Spring Security configuration for OAuth2, JWT authentication, method-level authorization, and CORS/CSRF protection \n Provides Spring Data JPA patterns: repositories, query methods, pagination, auditing, and transaction management \n Integrates Actuator for health ch