Apache FtpServer

What it does

Access controls

Listed controls include virtual directories, write permissions, idle timeouts, bandwidth limits, and IP restrictions.checked 8 Oct 2026

Deployment

FtpServer can run as a Windows service or Unix/Linux daemon and can be embedded in Java applications.checked 8 Oct 2026

Downloads

The 1.2.1 release page offers binary and source distributions in ZIP, tar.gz, and tar.bz2 formats, with hashes and PGP signatures.checked 8 Oct 2026

Extensibility

The Ftplet API lets Java code process FTP event notifications, and custom user managers, IP restrictors, and loggers can be added.checked 8 Oct 2026

FTP features

The server supports resumable uploads and downloads, ASCII and binary transfers, anonymous login, and customizable FTP messages.checked 8 Oct 2026

Integrations

The project provides integration with Spring applications and distributes releases as OSGi bundles.checked 8 Oct 2026

Notable limit

The FAQ explains that frequent client connections and disconnections can exhaust operating-system file handles because closed sockets remain in TIME_WAIT.checked 8 Oct 2026

Protocols

The documentation lists support for RFC 959, RFC 2228, RFC 2389, RFC 2428, and RFC 2640.checked 8 Oct 2026

Purpose

Apache FtpServer is a pure Java FTP server designed as a portable server engine that can run standalone or be embedded in a Java application.checked 8 Oct 2026

Scaling

Its default network support uses Apache MINA, which the project says can scale to a large number of concurrent users.checked 8 Oct 2026

Security

The feature list states that implicit and explicit SSL/TLS are supported.checked 8 Oct 2026

Support

Users are directed to the FtpServer users mailing list for questions about using the product.checked 8 Oct 2026

User data

User data can be stored in a database or file, and custom user managers can be added.checked 8 Oct 2026