使用Hibernate Validator自定义类级别验证，而无需使用注释。

示例代码：

public class User {

  private String name;

  @Valid
  private Address address;

  // getters and setters
}

public class Address {

  private String street1;

  private String street2;

  private String city;

  private String state;

  private String zipCode;

  // getters and setters
}

public class UserValidator implements ConstraintValidator {

  @Override
  public boolean isValid(User user, ConstraintValidatorContext context) {

    // check if user name is not empty
    if (StringUtils.isBlank(user.getName())) {
      context.buildConstraintViolationWithTemplate("User name cannot be blank")
        .addPropertyNode("name")
        .addConstraintViolation();
      return false;
    }

    // check if user address is valid
    if (user.getAddress() != null) {
      ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
      Validator validator = factory.getValidator();

      Set> constraintViolations = validator.validate(user.getAddress());
      if (!constraintViolations.isEmpty()) {
        for (ConstraintViolation
 violation : constraintViolations) {
          context.buildConstraintViolationWithTemplate(violation.getMessage())
            .addPropertyNode("address." + violation.getPropertyPath().toString())
            .addConstraintViolation();
        }
        return false;
      }
    }

    return true;
  }
}

该代码使用ConstraintValidator接口自定义了isValid方法，实现了类级别验证。在示例中，使用了StringUtils和Validation类和它们的方法。isValid方法检查了用户姓名是否为空值，还验证了用户地址是否有效。如果验证失败，则在ConstraintValidatorContext对象中添加验证约束违规。在User类中，使用了@ValidUser注释来指定类级别验证。

注意：在META-INF/validation.xml文件中添加以下内容启用类级别验证。

  com.example.myapp
  com.example.myapp.User
  
    com.example.myapp.UserValidator