fessConfig.getIndexFieldClickCount(), //
                    fessConfig.getIndexFieldFavoriteCount(), //
                    fessConfig.getIndexFieldLang());
            // Initialize Set for O(1) lookup performance
            searchFieldSet = new HashSet<>();
            Collections.addAll(searchFieldSet, searchFields);
        }
        if (facetFields == null) {

            <groupId>org.mvnsearch</groupId>
            <artifactId>toolchains-maven-plugin</artifactId>
            <executions>
              <execution>
                <id>download-11</id>
                <phase>initialize</phase>
                <goals>
                  <goal>toolchain</goal>
                </goals>
                <configuration>
                  <toolchains>
                    <jdk>

            <groupId>org.mvnsearch</groupId>
            <artifactId>toolchains-maven-plugin</artifactId>
            <executions>
              <execution>
                <id>download-11</id>
                <phase>initialize</phase>
                <goals>
                  <goal>toolchain</goal>
                </goals>
                <configuration>
                  <toolchains>
                    <jdk>

To add a function that should be run before the application starts, declare it with the event `"startup"`:

{* ../../docs_src/events/tutorial001_py39.py hl[8] *}

In this case, the `startup` event handler function will initialize the items "database" (just a `dict`) with some values.

You can add more than one event handler function.

And your application won't start receiving requests until all the `startup` event handlers have completed.

    /** The interval for storing search logs. */
    protected long searchStoreInterval = 1; // min

    /**
     * Initializes the SuggestHelper.
     * This method sets up the suggester, configures field names, and initializes
     * the connection to the search engine.
     */
    @PostConstruct
    public void init() {
        if (logger.isDebugEnabled()) {

 * It handles file access, directory listing, and access control entries (ACEs) processing.
 * </p>
 *
 * <p>
 * The class provides methods to:
 * </p>
 * <ul>
 *   <li>Initialize the client with SMB authentication details.</li>
 *   <li>Retrieve content and metadata from SMB files.</li>
 *   <li>Process access control entries to determine allowed and denied SIDs (Security Identifiers).</li>

            fessConfig.storeSystemProperties();
            return authenticator;
        } catch (final Exception e) {
            throw new SsoLoginException("Failed to initialize SPNEGO.", e);
        }
    }

    /**
     * Attempts to obtain login credentials using SPNEGO authentication.
     *
     * This method processes the HTTP request to extract and validate SPNEGO

goto endDetectBaseDir

:baseDirNotFound
if "_%EXEC_DIR:~-1%"=="_\" set "EXEC_DIR=%EXEC_DIR:~0,-1%"
set "MAVEN_PROJECTBASEDIR=%EXEC_DIR%"
cd /d "%EXEC_DIR%"

:endDetectBaseDir

rem Initialize JVM_CONFIG_MAVEN_OPTS to empty to avoid inheriting from environment
set JVM_CONFIG_MAVEN_OPTS=

if not exist "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" goto endReadJvmConfig

                logger.debug("tikaExtractor is not found: {}", e.getMessage().replace('\n', ' '));
            }
        } catch (final Exception e) {
            logger.warn("Failed to initialize TikaExtractor.", e);
        }
    }

    /**
     * Processes and normalizes a document title.
     * Applies text normalization using configured space characters and returns

                final DuplicateHostHelper duplicateHostHelper = ComponentUtil.getDuplicateHostHelper();
                duplicateHostHelper.init();
            } catch (final Exception e) {
                logger.warn("Could not initialize duplicateHostHelper.", e);
            }

            // delete expired sessions
            crawlingInfoService.deleteSessionIdsBefore(options.sessionId, options.name, systemHelper.getCurrentTimeAsLong());