# Dependencies { #dependencies }

**FastAPI** has a very powerful but intuitive **<dfn title="also known as components, resources, providers, services, injectables">Dependency Injection</dfn>** system.

It is designed to be very simple to use, and to make it very easy for any developer to integrate other components with **FastAPI**.

## What is "Dependency Injection" { #what-is-dependency-injection }

import org.codelibs.fess.util.ComponentUtil;
import org.lastaflute.web.Execute;
import org.lastaflute.web.response.JsonResponse;
import org.opensearch.action.bulk.BulkResponse;

import jakarta.annotation.Resource;

/**
 * API action for admin document management.
 * Provides RESTful API endpoints for bulk document operations in the Fess search engine.

# https://github.com/apache/lucene-solr/blob/master/lucene/analysis/common/src/resources/org/apache/lucene/analysis/fa/stopwords.txt
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    /**
     * An application extending this class must provide an implementation for this method that returns new user
     * credentials try try when accessing SMB resources described by the <code>getRequestingURL</code> and
     * <code>getRequestingException</code> methods.
     * If this method returns <code>null</code> the <code>SmbAuthException</code> that triggered the authenticator check will

 */
package org.codelibs.fess.dict;

import java.util.Base64;
import java.util.Date;
import java.util.regex.Pattern;

import org.codelibs.fess.Constants;

import jakarta.annotation.Resource;

/**
 * Abstract base class for creating dictionary files from file paths.
 * Dictionary creators are responsible for recognizing specific file patterns
 * and creating appropriate DictionaryFile instances for them.
 */

     * Provides database access methods for DataConfig entities.
     */
    @Resource
    protected DataConfigBhv dataConfigBhv;

    /**
     * Fess configuration containing application settings.
     * Used to retrieve paging and other configuration parameters.
     */
    @Resource
    protected FessConfig fessConfig;

    /**
     * Creates a new instance of DataConfigService.

    //                                                                           Attribute
    //                                                                           =========
    @Resource
    private FailureUrlService failureUrlService;
    @Resource
    private FailureUrlPager failureUrlPager;

    // ===================================================================================

    //                                                                           =========
    /** Service for job log operations. */
    @Resource
    private JobLogService jobLogService;

    /** Pager for job log list pagination. */
    @Resource
    private JobLogPager jobLogPager;

    // ===================================================================================

     * Used to perform database operations on crawling session parameters.
     */
    @Resource
    protected CrawlingInfoParamBhv crawlingInfoParamBhv;

    /**
     * Behavior handler for CrawlingInfo entities.
     * Used to perform database operations on crawling session information.
     */
    @Resource
    protected CrawlingInfoBhv crawlingInfoBhv;

    /**

    //                                                                           Attribute
    //                                                                           =========
    @Resource
    private PathMappingService pathMappingService;
    @Resource
    private PathMapPager pathMapPager;

    // ===================================================================================