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Trigger: When building or refactoring Spring Boot 3 applications.","ComeOnOliver\u002Fskillshub","ComeOnOliver","https:\u002F\u002Favatars.githubusercontent.com\u002Fu\u002F43215937?v=4","01M6E5JNFECJAAVFE0W7SMWWD2","Haoran Shu","01M6E5JNNDQS7AJZDYFQ8TPZCK",67,"MIT","https:\u002F\u002Fgithub.com\u002FComeOnOliver\u002Fskillshub\u002Fblob\u002Fmain\u002Fskills\u002FGentleman-Programming\u002FGentleman-Skills\u002Fspring-boot-3\u002FSKILL.md",[],[19,20,21,22,23,24,25,26,27,28,29],"boot","spring boot","spring","spring boot 3","web","services","applications","refactoring","configuration","patterns","trigger","2026-11-10 10:12:30",false,"---\nname: spring-boot-3\ndescription: >\n  Spring Boot 3 patterns for configuration, DI, and web services.\n  Trigger: When building or refactoring Spring Boot 3 applications.\nmetadata:\n  author: diegnghrmr\n  version: \"1.0\"\n---\n\n## When to Use\n\nLoad this skill when:\n- Building a Spring Boot 3.3+ service or API\n- Wiring beans with dependency injection\n- Defining configuration properties and validation\n- Implementing REST controllers and service layers\n\n## Critical Patterns\n\n### Pattern 1: Constructor injection only\n\nAlways use constructor injection; avoid field injection.\n\n### Pattern 2: Typed configuration properties\n\nUse @ConfigurationProperties with validation, not scattered @Value.\n\n### Pattern 3: Transaction boundaries at service layer\n\nApply @Transactional on application services, not controllers.\n\n## Code Examples\n\n### Example 1: Configuration properties with validation\n\n```java\npackage com.acme.config;\n\nimport jakarta.validation.constraints.NotBlank;\nimport org.springframework.boot.context.properties.ConfigurationProperties;\nimport org.springframework.validation.annotation.Validated;\n\n@Validated\n@ConfigurationProperties(prefix = \"payment\")\npublic record PaymentProperties(\n  @NotBlank String provider,\n  @NotBlank String apiKey\n) { }\n```\n\n```java\npackage com.acme;\n\nimport org.springframework.boot.context.properties.ConfigurationPropertiesScan;\nimport org.springframework.boot.autoconfigure.SpringBootApplication;\n\n@SpringBootApplication\n@ConfigurationPropertiesScan\npublic class Application { }\n```\n\n### Example 2: Service with constructor injection + transaction\n\n```java\npackage com.acme.order.application;\n\nimport org.springframework.stereotype.Service;\nimport org.springframework.transaction.annotation.Transactional;\n\n@Service\npublic final class OrderService {\n  private final OrderRepository repository;\n\n  public OrderService(OrderRepository repository) {\n    this.repository = repository;\n  }\n\n  @Transactional\n  public void placeOrder(OrderCommand command) {\n    repository.save(command.toEntity());\n  }\n}\n```\n\n### Example 3: REST controller with DTO records\n\n```java\npackage com.acme.order.api;\n\nimport org.springframework.http.ResponseEntity;\nimport org.springframework.web.bind.annotation.*;\n\n@RestController\n@RequestMapping(\"\u002Forders\")\npublic final class OrderController {\n  private final OrderService service;\n\n  public OrderController(OrderService service) {\n    this.service = service;\n  }\n\n  @PostMapping\n  public ResponseEntity\u003COrderResponse> place(@RequestBody OrderRequest request) {\n    service.placeOrder(request.toCommand());\n    return ResponseEntity.ok(new OrderResponse(\"ok\"));\n  }\n\n  public record OrderRequest(String sku, int qty) {\n    public OrderCommand toCommand() { return new OrderCommand(sku, qty); }\n  }\n\n  public record OrderResponse(String status) { }\n}\n```\n\n## Anti-Patterns\n\n### Don't: Use field injection\n\n```java\n\u002F\u002F BAD: field injection\n@Service\npublic class OrderService {\n  @org.springframework.beans.factory.annotation.Autowired\n  private OrderRepository repository;\n}\n```\n\n### Don't: Scatter configuration with @Value\n\n```java\n\u002F\u002F BAD: hard to validate and test\n@Service\npublic class PaymentService {\n  @org.springframework.beans.factory.annotation.Value(\"${payment.apiKey}\")\n  private String apiKey;\n}\n```\n\n## Quick Reference\n\n| Task | Pattern |\n|------|---------|\n| Inject dependencies | Constructor injection only |\n| Read config | @ConfigurationProperties + @Validated |\n| Transactions | @Transactional on services |\n\n## Resources\n\n- Spring Boot Reference: https:\u002F\u002Fdocs.spring.io\u002Fspring-boot\u002Fdocs\u002Fcurrent\u002Freference\u002Fhtml\u002F\n- Spring Framework Reference: https:\u002F\u002Fdocs.spring.io\u002Fspring-framework\u002Freference\u002F\n\n","## When to Use\n\nLoad this skill when:\n- Building a Spring Boot 3.3+ service or API\n- Wiring beans with dependency injection\n- Defining configuration properties and validation\n- Implementing REST controllers and service layers\n\n## Critical Patterns\n\n### Pattern 1: Constructor injection only\n\nAlways use constructor injection; avoid field injection.\n\n### Pattern 2: Typed configuration properties\n\nUse @ConfigurationProperties with validation, not scattered @Value.\n\n### Pattern 3: Transaction boundaries at service layer\n\nApply @Transactional on application services, not controllers.\n\n## Code Examples\n\n### Example 1: Configuration properties with validation\n\n```java\npackage com.acme.config;\n\nimport jakarta.validation.constraints.NotBlank;\nimport org.springframework.boot.context.properties.ConfigurationProperties;\nimport org.springframework.validation.annotation.Validated;\n\n@Validated\n@ConfigurationProperties(prefix = \"payment\")\npublic record PaymentProperties(\n  @NotBlank String provider,\n  @NotBlank String apiKey\n) { }\n```\n\n```java\npackage com.acme;\n\nimport org.springframework.boot.context.properties.ConfigurationPropertiesScan;\nimport org.springframework.boot.autoconfigure.SpringBootApplication;\n\n@SpringBootApplication\n@ConfigurationPropertiesScan\npublic class Application { }\n```\n\n### Example 2: Service with constructor injection + transaction\n\n```java\npackage com.acme.order.application;\n\nimport org.springframework.stereotype.Service;\nimport org.springframework.transaction.annotation.Transactional;\n\n@Service\npublic final class OrderService {\n  private final OrderRepository repository;\n\n  public OrderService(OrderRepository repository) {\n    this.repository = repository;\n  }\n\n  @Transactional\n  public void placeOrder(OrderCommand command) {\n    repository.save(command.toEntity());\n  }\n}\n```\n\n### Example 3: REST controller with DTO records\n\n```java\npackage com.acme.order.api;\n\nimport org.springframework.http.ResponseEntity;\nimport org.springframework.web.bind.annotation.*;\n\n@RestController\n@RequestMapping(\"\u002Forders\")\npublic final class OrderController {\n  private final OrderService service;\n\n  public OrderController(OrderService service) {\n    this.service = service;\n  }\n\n  @PostMapping\n  public ResponseEntity\u003COrderResponse> place(@RequestBody OrderRequest request) {\n    service.placeOrder(request.toCommand());\n    return ResponseEntity.ok(new OrderResponse(\"ok\"));\n  }\n\n  public record OrderRequest(String sku, int qty) {\n    public OrderCommand toCommand() { return new OrderCommand(sku, qty); }\n  }\n\n  public record OrderResponse(String status) { }\n}\n```\n\n## Anti-Patterns\n\n### Don't: Use field injection\n\n```java\n\u002F\u002F BAD: field injection\n@Service\npublic class OrderService {\n  @org.springframework.beans.factory.annotation.Autowired\n  private OrderRepository repository;\n}\n```\n\n### Don't: Scatter configuration with @Value\n\n```java\n\u002F\u002F BAD: hard to validate and test\n@Service\npublic class PaymentService {\n  @org.springframework.beans.factory.annotation.Value(\"${payment.apiKey}\")\n  private String apiKey;\n}\n```\n\n## Quick Reference\n\n| Task | Pattern |\n|------|---------|\n| Inject dependencies | Constructor injection only |\n| Read config | @ConfigurationProperties + @Validated |\n| Transactions | @Transactional on services |\n\n## Resources\n\n- Spring Boot Reference: https:\u002F\u002Fdocs.spring.io\u002Fspring-boot\u002Fdocs\u002Fcurrent\u002Freference\u002Fhtml\u002F\n- Spring Framework Reference: https:\u002F\u002Fdocs.spring.io\u002Fspring-framework\u002Freference\u002F\n\n",{"name":5,"metadata":35,"description":38},{"author":36,"version":37},"diegnghrmr","1.0","Spring Boot 3 patterns for configuration, DI, and web services. 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