fix: Request validation in UserService

src/main/java/eu/ztsh/wymiana/service/UserService.java

@@ -4,8 +4,8 @@ import eu.ztsh.wymiana.data.repository.UserRepository;
 import eu.ztsh.wymiana.exception.UserAlreadyExistsException;
 import eu.ztsh.wymiana.model.User;
 import eu.ztsh.wymiana.util.UserMapper;
+import eu.ztsh.wymiana.validation.InstanceValidator;
 import eu.ztsh.wymiana.web.model.UserCreateRequest;
-import jakarta.validation.Valid;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 
@@ -16,8 +16,10 @@ import java.util.Optional;
 public class UserService {
 
     private final UserRepository userRepository;
+    private final InstanceValidator validator;
 
-    public User create(@Valid UserCreateRequest request) {
+    public User create(UserCreateRequest request) {
+        validator.validate(request);
         if (userRepository.findById(request.pesel()).isPresent()) {
             throw new UserAlreadyExistsException(request);
         }

src/main/java/eu/ztsh/wymiana/validation/Adult.java

@@ -16,9 +16,12 @@ import static java.lang.annotation.RetentionPolicy.RUNTIME;
 @Constraint(validatedBy = AdultValidator.class)
 @Documented
 public @interface Adult {
-    String message() default "{jakarta.validation.constraints.Adult.message}";
+    String message() default MESSAGE;
 
     Class<?>[] groups() default { };
 
     Class<? extends Payload>[] payload() default { };
+
+    String MESSAGE = "The person has not reached the age of 18";
+
 }

src/main/java/eu/ztsh/wymiana/validation/InstanceValidator.java

@@ -0,0 +1,20 @@
+package eu.ztsh.wymiana.validation;
+
+import jakarta.validation.Validator;
+
+public class InstanceValidator {
+
+    private final Validator validator;
+
+    public InstanceValidator(Validator validator) {
+        this.validator = validator;
+    }
+
+    public <T> void validate(T t, Class<?>... classes) {
+        var violations = validator.validate(t, classes);
+        if (!violations.isEmpty()) {
+            throw new ValidationFailedException(violations);
+        }
+    }
+
+}

src/main/java/eu/ztsh/wymiana/validation/InstanceValidatorFactory.java

@@ -0,0 +1,18 @@
+package eu.ztsh.wymiana.validation;
+
+import jakarta.validation.Validation;
+import jakarta.validation.ValidatorFactory;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class InstanceValidatorFactory {
+
+    @Bean
+    public InstanceValidator instanceValidator() {
+        try (ValidatorFactory factory = Validation.buildDefaultValidatorFactory()) {
+            return new InstanceValidator(factory.getValidator());
+        }
+    }
+
+}

src/main/java/eu/ztsh/wymiana/validation/ValidationFailedException.java

@@ -0,0 +1,20 @@
+package eu.ztsh.wymiana.validation;
+
+import jakarta.validation.ConstraintViolation;
+import lombok.Getter;
+
+import java.util.Set;
+import java.util.stream.Collectors;
+
+@Getter
+public class ValidationFailedException extends RuntimeException {
+
+    private final transient Set<?> violations;
+
+    public <T> ValidationFailedException(Set<ConstraintViolation<T>> violations) {
+        super("Validation failed: %s".formatted(violations.stream()
+            .map(ConstraintViolation::getMessage).collect(Collectors.joining(System.lineSeparator()))));
+        this.violations = violations;
+    }
+
+}

src/main/java/eu/ztsh/wymiana/web/model/UserCreateRequest.java

@@ -3,7 +3,9 @@ package eu.ztsh.wymiana.web.model;
 import eu.ztsh.wymiana.validation.Adult;
 import jakarta.validation.constraints.Min;
 import jakarta.validation.constraints.NotNull;
+import lombok.Builder;
 
+@Builder
 public record UserCreateRequest(
     @NotNull String name,
     @NotNull String surname,

src/test/java/eu/ztsh/wymiana/EntityCreator.java

@@ -23,8 +23,11 @@ public class EntityCreator {
         return new UserEntityBuilder();
     }
 
-    public static UserCreateRequest userRequest() {
-        return new UserCreateRequest(Constants.NAME, Constants.SURNAME, Constants.PESEL, Constants.PLN);
+    public static UserCreateRequest.UserCreateRequestBuilder userRequest() {
+        return UserCreateRequest.builder().name(Constants.NAME)
+            .surname(Constants.SURNAME)
+            .pesel(Constants.PESEL)
+            .pln(Constants.PLN);
     }
 
     public static class UserEntityBuilder {

src/test/java/eu/ztsh/wymiana/service/UserServiceTest.java

@@ -5,7 +5,11 @@ import eu.ztsh.wymiana.RepositoryBasedTest;
 import eu.ztsh.wymiana.data.repository.UserRepository;
 import eu.ztsh.wymiana.exception.UserAlreadyExistsException;
 import eu.ztsh.wymiana.util.UserMapper;
+import eu.ztsh.wymiana.validation.Adult;
+import eu.ztsh.wymiana.validation.InstanceValidator;
+import eu.ztsh.wymiana.validation.ValidationFailedException;
 import jakarta.transaction.Transactional;
+import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
 
@@ -17,31 +21,58 @@ class UserServiceTest extends RepositoryBasedTest {
     private final UserService userService;
 
     @Autowired
-    public UserServiceTest(UserRepository userRepository) {
+    public UserServiceTest(UserRepository userRepository, InstanceValidator instanceValidator) {
         super(userRepository);
-        userService = new UserService(userRepository);
+        userService = new UserService(userRepository, instanceValidator);
     }
 
     @Test
     @Transactional
+    @DisplayName("Create new user")
     void createNewUserTest() {
-        userService.create(EntityCreator.userRequest());
+        userService.create(EntityCreator.userRequest().build());
         var entity = EntityCreator.user().build();
         expect(entity);
     }
 
     @Test
-    void createDuplicatedUser() {
-        var first = EntityCreator.userRequest();
-        var second = EntityCreator.userRequest();
+    @DisplayName("Try to create user that already exists")
+    void createDuplicatedUserTest() {
+        var first = EntityCreator.userRequest().build();
+        var second = EntityCreator.userRequest().build();
         userService.create(first);
         assertThatThrownBy(() -> userService.create(second))
                 .isInstanceOf(UserAlreadyExistsException.class)
                 .hasMessage("User with PESEL %s already exists".formatted(EntityCreator.Constants.PESEL));
     }
 
+    @Test
+    @DisplayName("Try to create another user with same PESEL")
+    void createDuplicatedPeselTest() {
+        var first = EntityCreator.userRequest().build();
+        var second = EntityCreator.userRequest()
+                .name("Jan")
+                .surname("Kowalski")
+                .pln(30.30)
+                .build();
+        userService.create(first);
+        assertThatThrownBy(() -> userService.create(second))
+                .isInstanceOf(UserAlreadyExistsException.class)
+                .hasMessage("User with PESEL %s already exists".formatted(EntityCreator.Constants.PESEL));
+    }
+
+    @Test
+    @DisplayName("Try to create too young user")
+    void youngUserTest() {
+        var request = EntityCreator.userRequest().pesel("08280959342").build();
+        assertThatThrownBy(() -> userService.create(request))
+                .isInstanceOf(ValidationFailedException.class)
+                .hasMessageContaining(Adult.MESSAGE);
+    }
+
     @Test
     @Transactional
+    @DisplayName("Get existing user")
     void getExistingUserTest() {
         var entity = EntityCreator.user().build();
         userRepository.save(entity);
@@ -55,6 +86,7 @@ class UserServiceTest extends RepositoryBasedTest {
     }
 
     @Test
+    @DisplayName("Try get non-existing user")
     void getNonExistingUserTest() {
         var userOptional = userService.get(EntityCreator.Constants.PESEL);
         assertThat(userOptional).isEmpty();

src/test/java/eu/ztsh/wymiana/util/UserMapperTest.java

@@ -27,7 +27,7 @@ class UserMapperTest {
 
     @Test
     void requestToEntityTest() {
-        var request = EntityCreator.userRequest();
+        var request = EntityCreator.userRequest().build();
         var expected = EntityCreator.user().build();
         assertThat(UserMapper.requestToEntity(request))
                 .usingRecursiveComparison()