@RestController
@RequestMapping("/api/users")
public class UserController {

    @PostMapping("/register")
    public ResponseEntity<String> registerUser(@Valid @RequestBody UserRegistrationDTO dto) {
        // 校驗(yàn)通過后執(zhí)行注冊(cè)邏輯
        return ResponseEntity.ok("注冊(cè)成功");
    }
}

public class UserRegistrationDTO {
    @Email(message = "郵箱格式不合法")
    private String email;

    @Pattern(regexp = "^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d).{8,}$", message = "密碼必須包含大小寫字母和數(shù)字，且長(zhǎng)度≥8")
    private String password;

    // Getter & Setter
}

Caused by: jakarta.validation.NoProviderFoundException: 
  Unable to create a Configuration, because no Jakarta Bean Validation provider could be found.

<!-- Maven -->
<dependency>
    <groupId>org.hibernate.validator</groupId>
    <artifactId>hibernate-validator</artifactId>
    <version>8.0.0.Final</version>
</dependency>
<dependency>
    <groupId>jakarta.validation</groupId>
    <artifactId>jakarta.validation-api</artifactId>
    <version>3.0.2</version>
</dependency>

<!-- Maven -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-validation</artifactId>
</dependency>

# Maven
mvn dependency:tree

# Gradle
./gradlew dependencies

<dependency>
    <groupId>org.hibernate.validator</groupId>
    <artifactId>hibernate-validator</artifactId>
    <version>8.0.0.Final</version>
    <exclusions>
        <exclusion>
            <groupId>javax.validation</groupId>
            <artifactId>validation-api</artifactId>
        </exclusion>
    </exclusions>
</dependency>

# Maven
mvn clean install -U

# Gradle
./gradlew clean build --refresh-dependencies

@RestControllerAdvice
public class GlobalExceptionHandler {

    @ExceptionHandler(MethodArgumentNotValidException.class)
    public ResponseEntity<ErrorResponse> handleValidationExceptions(MethodArgumentNotValidException ex) {
        List<String> errors = ex.getBindingResult()
                .getAllErrors()
                .stream()
                .map(error -> error.getDefaultMessage())
                .collect(Collectors.toList());
        return ResponseEntity.badRequest().body(new ErrorResponse("VALIDATION_FAILED", errors));
    }
}

public class ErrorResponse {
    private String code;
    private List<String> messages;

    // 構(gòu)造函數(shù)、Getter & Setter
}

{
  "code": "VALIDATION_FAILED",
  "messages": ["郵箱格式不合法", "密碼必須包含大小寫字母和數(shù)字，且長(zhǎng)度≥8"]
}

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-dependencies</artifactId>
            <version>3.1.5</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
Validator validator = factory.getValidator();
System.out.println(validator); // 若無報(bào)錯(cuò)則修復(fù)成功

logging.level.org.hibernate.validator=DEBUG