* For `PUT` requests to `/items/{item_id}`, read the body as JSON:
    * Check that it has a required attribute `name` that should be a `str`.
    * Check that it has a required attribute `price` that has to be a `float`.
    * Check that it has an optional attribute `is_offer`, that should be a `bool`, if present.
    * All this would also work for deeply nested JSON objects.

    // ===================================================================================
    //                                                                           Attribute
    //                                                                           =========
    @Resource
    private CrawlingInfoService crawlingInfoService;
    @Resource
    private CrawlingInfoPager crawlingInfoPager;

    // ===================================================================================
    //                                                                           Attribute
    //                                                                           =========
    @Resource
    private DataConfigService dataConfigService;

    // ===================================================================================
    //                                                                           Attribute
    //                                                                           =========
    @Resource
    protected DynamicProperties systemProperties;

    // ===================================================================================
    //                                                                           Attribute
    //                                                                           =========
    @Resource
    private RelatedQueryService relatedQueryService;
    @Resource
    private RelatedQueryPager relatedQueryPager;

    // ===================================================================================
    //                                                                           Attribute
    //
    @Resource
    protected DynamicProperties systemProperties;

    @Resource
    protected WebConfigService webConfigService;

    @Resource
    protected FileConfigService fileConfigService;

    }

    public static void validateAttributes(final Map<String, String> attributes, final Consumer<VaMessenger<FessMessages>> throwError) {
        ComponentUtil.getLdapManager().validateUserAttributes(Long.class, attributes,
                s -> throwError.accept(messages -> messages.addErrorsPropertyTypeLong("attributes." + s, "attributes." + s)));
    }

import java.nio.file.Path;
import java.nio.file.SecureDirectoryStream;
import java.nio.file.StandardOpenOption;
import java.nio.file.attribute.BasicFileAttributeView;
import java.nio.file.attribute.BasicFileAttributes;
import java.nio.file.attribute.FileAttribute;
import java.nio.file.attribute.FileTime;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.stream.Stream;

import java.nio.file.Path;
import java.nio.file.SecureDirectoryStream;
import java.nio.file.StandardOpenOption;
import java.nio.file.attribute.BasicFileAttributeView;
import java.nio.file.attribute.BasicFileAttributes;
import java.nio.file.attribute.FileAttribute;
import java.nio.file.attribute.FileTime;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.stream.Stream;

    // Constant
    //
    private static final Logger logger = LogManager.getLogger(ApiAdminSearchlistAction.class);

    // ===================================================================================
    // Attribute
    // =========
    @Resource
    protected SearchHelper searchHelper;

    @Resource
    protected SearchEngineClient searchEngineClient;