☕ Java

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// Java 21 with Spring Boot 3.x
@RestController
@RequestMapping("/api/v1/documents")
@RequiredArgsConstructor
public class DocumentController {
    
    private final DocumentService documentService;
    private final AIAnalysisService aiService;
    
    @GetMapping("/{id}")
    public ResponseEntity<DocumentDTO> getDocument(@PathVariable UUID id) {
        return documentService.findById(id)
            .map(doc -> ResponseEntity.ok(DocumentDTO.from(doc)))
            .orElse(ResponseEntity.notFound().build());
    }
    
    @PostMapping("/{id}/analyze")
    @PreAuthorize("hasRole('ANALYST')")
    public ResponseEntity<AnalysisResult> analyzeDocument(
            @PathVariable UUID id,
            @AuthenticationPrincipal UserDetails user) {
        
        var document = documentService.findById(id)
            .orElseThrow(() -> new NotFoundException("Document not found"));
        
        var result = aiService.analyze(document, user.getUsername());
        
        return ResponseEntity.ok(result);
    }
}

// Record for immutable DTOs
public record DocumentDTO(
    UUID id,
    String title,
    String content,
    Instant createdAt,
    UserDTO author
) {
    public static DocumentDTO from(Document doc) {
        return new DocumentDTO(
            doc.getId(),
            doc.getTitle(),
            doc.getContent(),
            doc.getCreatedAt(),
            UserDTO.from(doc.getAuthor())
        );
    }
}