java-springboot

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SKILL.md (first lines)

# Java Spring Boot (Java 21)

Development patterns for Spring Boot 3.x with Java 21.

## Project Structure

```
src/main/java/com/example/
├── Application.java
├── config/
│   ├── SecurityConfig.java
│   └── OpenApiConfig.java
├── controller/
├── service/
├── repository/
├── model/
│   ├── entity/
│   └── dto/
├── mapper/
└── exception/
```

## Dependencies (pom.xml)

```xml
<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>3.2.0</version>
</parent>

<properties>
    <java.version>21</java.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-validation</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springdoc</groupId>
        <artifactId>springdoc-openapi-starter-webmvc-ui</artifactId>
        <version>2.3.0</version>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.mapstruct</groupId>
        <artifactId>mapstruct</artifactId>
        <version>1.5.5.Final</version>
    </dependency>
</dependencies>
```

## Entity

```java
@Entity
@Table(name = "resources")
@Data
@NoArgsConstructor
@AllArgsConstructor
@Builder
public class ResourceEntity {
    @Id
    @GeneratedValue(strategy = GenerationType.UUID)
    private UUID id;
    
    @Column(nullable = false, length = 255)
    private String name;
    
    @Column(length = 1000)
    private String description;
    
    @CreationTimestamp
    private Instant createdAt;
    
    @UpdateTimestamp
    private Instant updatedAt;
    
    @Version
    private Long version;
}
```

## Repository

```java
public interface ResourceRepository extends JpaRepository<ResourceEntity, UUID> {
    
    Optional<ResourceEntity> findByName(String name);
    
    boolean existsByName(String name);
    
    @Query("SELECT r FROM ResourceEntity r WHERE " +
           "(:search IS NULL OR LOWER(r.name) LIKE LOWER(CONCAT('%', :search, '%')))")
    Page<ResourceEntity> findAllWithSearch(@Param("search") String search, Pageable pageable);
}
```

## DTOs (Records)

```java
// Response DTO
public record ResourceDto(
    UUID id,
    String name,

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