mvn formatter:format           # Format code
mvn license:format             # Update license headers
```

### Code Style

- 4 spaces (no tabs)
- Opening brace on same line
- Max line length: 120
- JavaDoc required for public APIs
- License headers required

### Testing

**Structure**: `src/test/java/org/codelibs/fess/crawler/`
**Frameworks**: JUnit 4, UTFlute, Mockito, Testcontainers

    String CRAWLER_DOCUMENT_HTML_PRUNED_TAGS = "crawler.document.html.pruned.tags";

    /** The key of the configuration. e.g. 120 */
    String CRAWLER_DOCUMENT_HTML_MAX_DIGEST_LENGTH = "crawler.document.html.max.digest.length";

    /** The key of the configuration. e.g.  */

crawler.document.html.pruned.tags=noscript,script,style,header,footer,aside,nav,a[rel=nofollow]
# Maximum length of digest extracted from HTML documents.
crawler.document.html.max.digest.length=120
# Default language for HTML documents.
crawler.document.html.default.lang=
# Patterns to include for HTML index processing.
crawler.document.html.default.include.index.patterns=