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…shome/exercise8 # Conflicts: # pom.xml
WalkthroughTransforms the project into a Spring Boot web application: adds Spring Boot parent/POM, REST controllers, JWT authentication and filter, security config, JPA entities/repositories, Flyway migrations, MySQL docker-compose and properties, dev data initializer, and Testcontainers-backed integration tests. Changes
Sequence Diagram(s)sequenceDiagram
actor Client
participant UserCtrl as UserController
participant AuthMgr as AuthenticationManager
participant JwtSvc as JwtService
participant JwtFilter as JwtAuthFilter
participant SKCtrl as SkateboardController
participant Repo as UserRepo/DB
Client->>UserCtrl: POST /auth/generateToken {username,password}
UserCtrl->>AuthMgr: authenticate(UsernamePasswordAuthenticationToken)
AuthMgr->>Repo: load user details
alt auth succeeds
AuthMgr-->>UserCtrl: Authentication
UserCtrl->>JwtSvc: generateToken(username)
JwtSvc-->>UserCtrl: JWT
UserCtrl-->>Client: 200 {token}
else auth fails
AuthMgr-->>UserCtrl: throws
UserCtrl-->>Client: 401/exception
end
Client->>SKCtrl: GET /api/decks (Authorization: Bearer token)
SKCtrl->>JwtFilter: request passes through filter
JwtFilter->>JwtSvc: extractUsername(token)
JwtSvc-->>JwtFilter: username
JwtFilter->>Repo: load UserDetails
JwtFilter->>JwtSvc: validateToken(token, userDetails)
alt token valid
JwtFilter->>SKCtrl: continue with SecurityContext set
SKCtrl->>Repo: findDeckBy()/findDeckById(...)
Repo-->>SKCtrl: deck(s)/DTOs
SKCtrl-->>Client: 200 OK with payload
else invalid/expired
JwtFilter-->>Client: 403 Forbidden
end
Estimated code review effort🎯 4 (Complex) | ⏱️ ~60 minutes Areas requiring extra attention:
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Actionable comments posted: 10
🧹 Nitpick comments (12)
src/main/java/org/example/entities/DAOs/AuthRequest.java (2)
1-1: Consider renaming the package from DAOs to a more appropriate name.The package is named "DAOs" (Data Access Objects), but AuthRequest is a request DTO, not a DAO. Consider renaming to
org.example.entities.dtosororg.example.entities.requestsfor better semantic clarity.
3-3: Consider adding validation annotations to the record components.For production-grade applications, adding Bean Validation annotations like
@NotBlankwould ensure proper validation of authentication credentials. However, this may be deferred in an exercise project.Example:
import jakarta.validation.constraints.NotBlank; public record AuthRequest(@NotBlank String username, @NotBlank String password) { }src/main/java/org/example/repositories/SkateboardRepository.java (2)
12-16: ReplaceList<Object>with a typed DTO projection.Returning
List<Object>(actuallyList<Object[]>at runtime) sacrifices type safety and requires manual casting. Additionally,findDeckBy()is a misleading name since it doesn't filter by any criteria.Create a projection DTO and rename the method:
// Create a new DTO record in org.example.entities.DTOs public record DeckBrandWidthDTO(String brand, Double boardWidth) {}Then update the query:
@Query(""" - select upper(deck.brand), deck.boardWidth + select new org.example.entities.DTOs.DeckBrandWidthDTO(upper(deck.brand), deck.boardWidth) from Deck deck """) - List<Object> findDeckBy(); + List<DeckBrandWidthDTO> findAllBrandAndWidth();
18-23: Rename method for clarity.The method name
findDeckBywithout any suffix is ambiguous since it filters by brand. Consider renaming tofindByBrandorfindDecksByBrandto follow Spring Data naming conventions.@Query(""" select deck from Deck deck where deck.brand = :brand """) - List<Deck> findDeckBy(@Param("brand") String brand); + List<Deck> findByBrand(@Param("brand") String brand);Note: With this naming, Spring Data JPA can derive the query automatically, eliminating the need for the explicit
@Query.src/test/java/org/example/SkateboardControllerTest.java (1)
8-8: Remove unused import.
ServiceConnectionis imported but not used. Either remove this import or use@ServiceConnectionon the container to simplify the datasource configuration (which would eliminate the need for@DynamicPropertySource).-import org.springframework.boot.testcontainers.service.connection.ServiceConnection;src/main/java/org/example/UserController.java (2)
18-24: Consider making fieldsfinalfor immutability.Declaring
jwtServiceandauthManagerasfinalbetter conveys intent and is idiomatic for constructor-injected dependencies.- private JwtService jwtService; - private AuthenticationManager authManager; + private final JwtService jwtService; + private final AuthenticationManager authManager;
32-36: TheisAuthenticated()check is unreachable on failure.
AuthenticationManager.authenticate()throws anAuthenticationException(e.g.,BadCredentialsException) when credentials are invalid—it never returns an unauthenticatedAuthenticationobject. Theelsebranch is dead code. Additionally,UsernameNotFoundExceptionis semantically incorrect for invalid credentials.@PostMapping("/generateToken") public String authenticateAndGetToken(@RequestBody AuthRequest authRequest) { - Authentication authentication = authManager.authenticate( + authManager.authenticate( new UsernamePasswordAuthenticationToken(authRequest.username(), authRequest.password()) ); - if (authentication.isAuthenticated()) { - return jwtService.generateToken(authRequest.username()); - } else { - throw new UsernameNotFoundException("Invalid credentials!"); - } + return jwtService.generateToken(authRequest.username()); }src/main/java/org/example/entities/TruckBrand.java (1)
17-17: Consider adding column constraints forbrand.Adding
@Columnconstraints improves data integrity and documents expectations:+ @Column(nullable = false, length = 100) private String brand;src/main/java/org/example/entities/TruckSize.java (1)
21-21: Consider using a proper JPA relationship forbrandId.The
brandIdfield is stored as a plainIntegerinstead of using@ManyToOne TruckBrand brand. This works, but you lose JPA-level referential integrity and the ability to navigate the relationship directly. The database FK (from the migration) still enforces integrity at the DB level.For an exercise project this is acceptable, but in production code a proper relationship would be preferred.
src/main/java/org/example/SkateboardController.java (1)
29-34: Consider throwing a more descriptive exception for 404 responses.Using
orElseThrow()without arguments throws a genericNoSuchElementException, resulting in a 500 error. For REST APIs, considerResponseStatusExceptionor a custom exception to return a proper 404.+import org.springframework.web.server.ResponseStatusException; +import org.springframework.http.HttpStatus; ... @GetMapping("/decks/id/{id}") public Deck findDeckById(@PathVariable Integer id) { - Deck deck = repository.findById(id).orElseThrow(); + Deck deck = repository.findById(id) + .orElseThrow(() -> new ResponseStatusException(HttpStatus.NOT_FOUND, "Deck not found: " + id)); deck.setFittingTrucks(truckSizeRepository.findTruckByWidth(deck.getBoardWidth())); return deck; }pom.xml (2)
16-28: Empty metadata elements should be filled in or removed.These placeholder elements (
<url/>,<license/>,<developer/>,<scm>with empty children) add noise. Consider removing them or filling in actual values.
82-86: Fix indentation for consistency.The
jjwt-apidependency block has inconsistent indentation compared to other dependencies.<dependency> - <groupId>io.jsonwebtoken</groupId> - <artifactId>jjwt-api</artifactId> - <version>${jjwt.version}</version> + <groupId>io.jsonwebtoken</groupId> + <artifactId>jjwt-api</artifactId> + <version>${jjwt.version}</version> </dependency>
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docker-compose.yml(1 hunks)pom.xml(1 hunks)src/main/java/org/example/App.java(0 hunks)src/main/java/org/example/Exercise2025Application.java(1 hunks)src/main/java/org/example/SkateboardController.java(1 hunks)src/main/java/org/example/UserController.java(1 hunks)src/main/java/org/example/config/ApiSecurityConfig.java(1 hunks)src/main/java/org/example/config/DevDataInitializer.java(1 hunks)src/main/java/org/example/config/SecurityConfig.java(1 hunks)src/main/java/org/example/entities/DAOs/AuthRequest.java(1 hunks)src/main/java/org/example/entities/DTOs/TruckDTO.java(1 hunks)src/main/java/org/example/entities/Deck.java(1 hunks)src/main/java/org/example/entities/TruckBrand.java(1 hunks)src/main/java/org/example/entities/TruckSize.java(1 hunks)src/main/java/org/example/filters/JwtAuthFilter.java(1 hunks)src/main/java/org/example/repositories/SkateboardRepository.java(1 hunks)src/main/java/org/example/repositories/TruckBrandRepository.java(1 hunks)src/main/java/org/example/repositories/TruckSizeRepository.java(1 hunks)src/main/java/org/example/services/JwtService.java(1 hunks)src/main/resources/application-dev.properties(1 hunks)src/main/resources/application.properties(1 hunks)src/main/resources/db/migration/V1__Initial.sql(1 hunks)src/main/resources/db/migration/V2__Truck.sql(1 hunks)src/test/java/org/example/AppIT.java(0 hunks)src/test/java/org/example/AppTest.java(0 hunks)src/test/java/org/example/SkateboardControllerTest.java(1 hunks)
💤 Files with no reviewable changes (3)
- src/main/java/org/example/App.java
- src/test/java/org/example/AppIT.java
- src/test/java/org/example/AppTest.java
🧰 Additional context used
🧠 Learnings (3)
📓 Common learnings
Learnt from: jennymakki
Repo: fungover/exercise2025 PR: 204
File: src/main/java/org/example/config/SecurityConfig.java:19-24
Timestamp: 2025-11-16T13:56:11.263Z
Learning: The repository fungover/exercise2025 is an exercise/learning project where hard-coded credentials and other shortcuts for ease of testing are acceptable and intentional.
📚 Learning: 2025-11-16T13:56:11.263Z
Learnt from: jennymakki
Repo: fungover/exercise2025 PR: 204
File: src/main/java/org/example/config/SecurityConfig.java:19-24
Timestamp: 2025-11-16T13:56:11.263Z
Learning: The repository fungover/exercise2025 is an exercise/learning project where hard-coded credentials and other shortcuts for ease of testing are acceptable and intentional.
Applied to files:
src/main/resources/application.propertiespom.xmlsrc/main/java/org/example/Exercise2025Application.java
📚 Learning: 2025-11-21T16:16:54.793Z
Learnt from: LolloGro
Repo: fungover/exercise2025 PR: 211
File: src/main/resources/templates/listOfBooks.html:11-12
Timestamp: 2025-11-21T16:16:54.793Z
Learning: In the repository fungover/exercise2025, the Author DTO uses NotEmpty validation on firstName and lastName fields, and BookDto uses NotNull validation on the author field. This validation architecture ensures that books always have complete author information, making null-safety checks in Thymeleaf templates unnecessary.
Applied to files:
pom.xml
🧬 Code graph analysis (5)
src/main/java/org/example/services/JwtService.java (1)
src/main/java/org/example/filters/JwtAuthFilter.java (1)
Component(19-61)
src/main/java/org/example/filters/JwtAuthFilter.java (1)
src/main/java/org/example/services/JwtService.java (1)
Component(20-87)
src/main/java/org/example/entities/TruckSize.java (2)
src/main/java/org/example/entities/Deck.java (1)
Entity(12-102)src/main/java/org/example/entities/TruckBrand.java (1)
Entity(10-67)
src/main/java/org/example/entities/Deck.java (2)
src/main/java/org/example/entities/TruckBrand.java (1)
Entity(10-67)src/main/java/org/example/entities/TruckSize.java (1)
Entity(10-89)
src/main/java/org/example/entities/TruckBrand.java (2)
src/main/java/org/example/entities/Deck.java (1)
Entity(12-102)src/main/java/org/example/entities/TruckSize.java (1)
Entity(10-89)
🔇 Additional comments (18)
src/main/resources/application-dev.properties (1)
1-4: LGTM! Well-configured development profile.The development profile settings are appropriate:
- Docker Compose lifecycle management allows manual service control
- SQL logging aids in debugging database interactions
- Security debug logging helps troubleshoot JWT authentication flows
src/main/resources/db/migration/V1__Initial.sql (1)
1-9: LGTM! Clean initial schema migration.The deck table schema is well-defined with appropriate constraints and data types. The primary key, nullable brand, and required board_width align with typical skateboard domain modeling.
src/main/java/org/example/entities/DTOs/TruckDTO.java (1)
1-4: LGTM! Clean and appropriate DTO.The TruckDTO record is well-structured for its purpose of carrying truck brand and size information from the repository layer to the controller.
src/main/java/org/example/repositories/TruckBrandRepository.java (1)
1-7: LGTM! Standard Spring Data repository.The repository interface correctly extends
ListCrudRepositoryand follows Spring Data conventions. No custom methods are needed for the current use case.src/main/resources/application.properties (1)
1-7: Configuration verified—Java 25 supports virtual threads.Java version 25 is configured in
pom.xml, which exceeds the minimum requirement of Java 21 for virtual threads. The application configuration is correct and properly aligned.docker-compose.yml (1)
3-3: MySQL 9.5.0 is a valid Docker image tag and is available on Docker Hub.The specified image version exists and is properly available for use. No changes are required.
src/main/java/org/example/filters/JwtAuthFilter.java (1)
19-29: LGTM on the filter structure and dependency injection.The constructor injection pattern with
@Autowiredis clean, and extendingOncePerRequestFilterensures the filter runs exactly once per request. The authentication flow correctly sets theSecurityContextwhen a valid token is present.src/main/java/org/example/config/DevDataInitializer.java (1)
36-79: LGTM on the overall structure.The dev data initializer is well-structured with proper profile scoping, transactional boundaries, and logging. The seeded data provides a good baseline for development testing.
src/main/java/org/example/entities/TruckBrand.java (1)
52-66: Proxy-awareequals/hashCodeimplementation is correct.The implementation correctly handles Hibernate proxies and uses ID-based equality, consistent with the
TruckSizeandDeckentities.src/main/java/org/example/entities/TruckSize.java (1)
74-88: LGTM!The
equals/hashCodeimplementation follows the recommended proxy-aware pattern for JPA entities, consistent with other entities in the codebase (TruckBrand,Deck).src/main/java/org/example/entities/Deck.java (2)
12-37: LGTM!The entity structure is well-designed with proper JPA annotations. The
@Transientannotation forfittingTruckscorrectly excludes it from persistence while allowing runtime enrichment in the controller.
87-101: LGTM!The
equals/hashCodeimplementation is proxy-aware and consistent with the other entities in this PR.src/main/java/org/example/services/JwtService.java (3)
23-24: Hard-coded JWT secret is acceptable for this exercise project.Based on learnings, this repository is an exercise/learning project where hard-coded credentials are intentional for ease of testing. In production, this should be externalized to configuration/secrets management.
71-77: LGTM!The token parsing implementation is correct for jjwt 0.11.x. Exceptions like
ExpiredJwtExceptionorMalformedJwtExceptionwill propagate and be handled by Spring Security's filter chain.
43-49: Verified: Review comment is accurate and appropriately scoped.The project uses jjwt 0.11.5 as confirmed in
pom.xml. The code correctly uses the builder methods (setClaims(),setSubject(),setIssuedAt(),setExpiration(), andsignWith(key, SignatureAlgorithm.HS256)) which are valid for this version. The web search confirms these methods are indeed deprecated in jjwt 0.12+, making this an appropriate optional refactoring suggestion for future upgrades. No action is required on the current version, but the guidance is sound.pom.xml (3)
30-30: Java 25 may not be released yet.Java 25 is scheduled for September 2025. If you're using early access builds, this is fine. Otherwise, consider using Java 21 (LTS) or Java 23 for stability.
33-111: LGTM!Dependencies are well-structured for a Spring Boot application with JWT authentication, JPA persistence, Flyway migrations, and Testcontainers for integration testing.
5-10: Spring Boot 3.5.7 is valid and current.Spring Boot 3.5.7 was released on October 23, 2025, and is available from Maven Central. The version includes 69 bug fixes, documentation improvements, and dependency upgrades, making it a suitable choice for your project.
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Actionable comments posted: 1
♻️ Duplicate comments (1)
src/test/java/org/example/SkateboardControllerTest.java (1)
44-84: Consider adding response body assertions for more robust tests.The tests currently only verify HTTP status codes. For more comprehensive coverage, consider asserting on response body content (e.g., using
jsonPath()orcontent()matchers) to verify the expected data structure and values are returned.Example enhancement:
mockMvc.perform(get("/api/decks") .header("Authorization", token)) .andExpect(status().isOk()) .andExpect(jsonPath("$").isArray()) .andExpect(jsonPath("$[0].brand").exists());Note: The test at line 63 for
/api/decks/id/1assumes a deck with ID 1 exists in test data - this was flagged in a previous review.
🧹 Nitpick comments (4)
src/main/java/org/example/entities/DTOs/DeckDTO.java (1)
1-4: Consider lowercase package name for consistency with Java conventions.The package uses
DTOswith uppercase, but Java conventions typically prefer lowercase package names (e.g.,org.example.entities.dtoororg.example.entities.dtos). This is a minor style consideration.The record itself is well-defined and correctly used for JPQL constructor expression projections.
src/main/java/org/example/config/DevDataInitializer.java (1)
56-79: Verify that brand IDs are populated before creating TruckSize entities.The code accesses
ace.getId(),independent.getId(), andthunder.getId()aftersaveAll(). This works correctly becausesaveAll()on a JPA repository returns managed entities with populated IDs, and you're reusing the same object references.However, to make this more explicit and safer:
- truckBrandRepository.saveAll(List.of( - ace, - independent, - thunder - )); + List<TruckBrand> savedBrands = truckBrandRepository.saveAll(List.of( + ace, + independent, + thunder + )); + var savedAce = savedBrands.get(0); + var savedIndependent = savedBrands.get(1); + var savedThunder = savedBrands.get(2);Then use the saved references for
TruckSizecreation.src/main/java/org/example/repositories/SkateboardRepository.java (1)
11-25: Consider more descriptive method names to avoid confusion.Both methods are named
findDeckBy()with different signatures and return types (List<DeckDTO>vsList<Deck>). While valid, this can be confusing for callers. Consider more descriptive names:- List<DeckDTO> findDeckBy(); + List<DeckDTO> findAllDecksAsDto(); - List<Deck> findDeckBy(@Param("brand") String brand); + List<Deck> findByBrand(@Param("brand") String brand);The second method could also use Spring Data's derived query naming (
findByBrand) to eliminate the custom@Queryif the simple equality check is sufficient.src/main/java/org/example/SkateboardController.java (1)
51-54: Previous save/return concern has been addressed.The endpoint now correctly returns the result of
repository.save(newDeck), which includes generated ID and any other persisted values.Consider adding
@Validannotation for request body validation if theDeckentity has validation constraints:public Deck addDeck(@Valid @RequestBody Deck newDeck)Also, the RESTful convention would prefer
POST /decksoverPOST /decks/create.
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src/main/java/org/example/Exercise2025Application.java(1 hunks)src/main/java/org/example/SkateboardController.java(1 hunks)src/main/java/org/example/config/DevDataInitializer.java(1 hunks)src/main/java/org/example/entities/DTOs/DeckDTO.java(1 hunks)src/main/java/org/example/filters/JwtAuthFilter.java(1 hunks)src/main/java/org/example/repositories/SkateboardRepository.java(1 hunks)src/main/java/org/example/repositories/TruckSizeRepository.java(1 hunks)src/main/resources/db/migration/V2__Truck.sql(1 hunks)src/test/java/org/example/SkateboardControllerTest.java(1 hunks)src/test/resources/org/example/test-data.sql(1 hunks)
✅ Files skipped from review due to trivial changes (1)
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🚧 Files skipped from review as they are similar to previous changes (3)
- src/main/resources/db/migration/V2__Truck.sql
- src/main/java/org/example/filters/JwtAuthFilter.java
- src/main/java/org/example/repositories/TruckSizeRepository.java
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🧠 Learnings (1)
📚 Learning: 2025-11-16T13:56:11.263Z
Learnt from: jennymakki
Repo: fungover/exercise2025 PR: 204
File: src/main/java/org/example/config/SecurityConfig.java:19-24
Timestamp: 2025-11-16T13:56:11.263Z
Learning: The repository fungover/exercise2025 is an exercise/learning project where hard-coded credentials and other shortcuts for ease of testing are acceptable and intentional.
Applied to files:
src/main/java/org/example/Exercise2025Application.java
🔇 Additional comments (4)
src/main/java/org/example/Exercise2025Application.java (1)
9-11: LGTM! Previous issue resolved.The main method signature is now correct with
public staticmodifiers. The Spring Boot application entry point follows the standard pattern and will work properly with conventional Java application launchers.src/test/java/org/example/SkateboardControllerTest.java (1)
19-23: Good test setup with Testcontainers and class-level SQL initialization.The test configuration with
@Testcontainers,@SpringBootTest,@AutoConfigureMockMvc, and@Sqlat the class level is well-structured for integration testing with a real MySQL database.src/main/java/org/example/config/DevDataInitializer.java (1)
44-48: Good fix for the duplicate data issue.The previous review's concern about
force-initcreating duplicate data has been addressed. The deletion order (truckSize → truckBrand → skateboard) correctly respects foreign key constraints.src/main/java/org/example/SkateboardController.java (1)
25-28: Previous DTO concern has been addressed.The endpoint now correctly returns
List<DeckDTO>instead ofList<Object>, providing a clear API contract.
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Actionable comments posted: 0
🧹 Nitpick comments (3)
src/main/java/org/example/SkateboardController.java (3)
32-39: Proper error handling, but consider a response DTO for truck enrichment.The 404 handling is now correctly implemented. However, mutating the retrieved entity in-place (line 37) couples the controller to entity internals. Consider creating a dedicated response DTO that combines deck information with fitting trucks, rather than setting a transient field on the entity.
Example refactor:
// Create DeckWithTrucksDTO public record DeckWithTrucksDTO(DeckDTO deck, List<TruckDTO> fittingTrucks) {} // In controller: @GetMapping("/decks/id/{id}") public DeckWithTrucksDTO findDeckById(@PathVariable Integer id) { Deck deck = repository.findById(id) .orElseThrow(() -> new ResponseStatusException( HttpStatus.NOT_FOUND, "Deck not found with id: " + id)); List<TruckDTO> trucks = truckSizeRepository.findTruckByWidth(deck.getBoardWidth()); return new DeckWithTrucksDTO(deck.toDTO(), trucks); }
41-53: Consider optimizing truck lookups to avoid N+1 queries.The loop at lines 49-51 calls
truckSizeRepository.findTruckByWidth()for each deck, resulting in N+1 database queries. For larger result sets, this could impact performance. Consider batch-fetching trucks for all unique board widths in a single query, then mapping them to the corresponding decks.Example approach:
@GetMapping("/decks/brand/{brand}") public List<Deck> findDeckBy(@PathVariable String brand) { List<Deck> decks = repository.findDeckBy(brand); if (decks.isEmpty()) { throw new ResponseStatusException( HttpStatus.NOT_FOUND, "No " + brand + " deck found." ); } // Collect unique widths and fetch trucks in batch Set<Double> widths = decks.stream() .map(Deck::getBoardWidth) .collect(Collectors.toSet()); Map<Double, List<TruckDTO>> trucksByWidth = widths.stream() .collect(Collectors.toMap( w -> w, w -> truckSizeRepository.findTruckByWidth(w) )); // Enrich decks decks.forEach(deck -> deck.setFittingTrucks(trucksByWidth.get(deck.getBoardWidth())) ); return decks; }
60-63: Add input validation for better error handling.The endpoint now correctly returns the saved entity. However, adding
@Validto the@RequestBodyparameter (along with validation annotations on theDeckentity) would provide clearer error messages for invalid input and catch issues before reaching the database.Example:
+import jakarta.validation.Valid; @PostMapping("/decks/create") -public Deck addDeck(@RequestBody Deck newDeck) { +public Deck addDeck(@Valid @RequestBody Deck newDeck) { return repository.save(newDeck); }Then add validation annotations to the
Deckentity:// In Deck.java @NotBlank private String brand; @Positive private Double boardWidth; // etc.
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🔇 Additional comments (3)
src/main/java/org/example/SkateboardController.java (3)
14-25: LGTM! Clean controller structure with proper dependency injection.The controller uses constructor injection with final fields, which is a Spring Boot best practice. The base path
/apiis appropriate for REST endpoints.
27-30: LGTM! Clean delegation to repository.The endpoint properly returns typed DTOs, addressing previous feedback.
55-58: LGTM! Clean endpoint for truck lookups.Simple delegation with appropriate return type.
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REST API made in Spring Boot
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