ReMEXA

ReMEXA is a modern Java reimplementation and host runtime for SoftBank MEXA S-Appli, Vodafone V-Appli, and J-SKY V-Appli software.

Overview

ReMEXA focuses on preserving and running Japanese feature-phone appli on modern desktop systems.

Current areas of work include:

• A Swing-based launcher with drag-and-drop .jad loading and recent launch history.
• Direct command-line launch support for .jad files.
• Compatibility and runtime support for javax.microedition, com.j_phone, com.vodafone, com.jblend, com.mexa, and many more APIs.
• Display, input, phone profile, and frame-rate configuration for target device behavior.
• Bitmap and system font rendering support.
• SMAF/MMF audio detection and playback paths for MA-3, MA-5, MA-7(in the future), and host MIDI output.
• Audio3D positioning, Doppler, and reverb
• Optional virtual Bluetooth-over-IP support for multiplayer titles.
• Debug logging, FPS overlay, host details, RMS dumps, and frame capture helpers for compatibility work.

Status

ReMEXA is an early work-in-progress project. While most appli launch and run, some may fail because of missing APIs, incomplete hardware behavior, media differences, timing differences, or appli-specific assumptions from original devices. If you encounter issues, you are encourged to open a issue ticket.

Install / Build

Requirements:

• JDK 24 or newer.
• Apache Maven.
• A configured Maven JDK toolchain for JDK 24+ if your Maven setup requires one.
• VLC installed on the host system if you want to exercise VLCJ-backed media features.

Build the nightly jar:

mvn -DskipTests package

Build the release jar:

mvn -Prelease -DskipTests package

Usage

Open the desktop launcher:

java -jar target/ReMEXA-Nightly.jar

From the launcher, open or drag in a .jad file.

Launch a .jad directly:

java -jar target/ReMEXA-Nightly.jar --run-jad path/to/app.jad

Useful launch options:

--show-host-details
--font bitmap|system
--jsky-phone JSKY-Generic|J-SH53
--vodafone-phone Vodafone-Generic|V604SH
--mexa-phone MEXA-Generic|930SH
--host-scale 1|2|3|4|5
--disable-dpi-scaling
--enable-dpi-scaling
--frame-rate uncapped|5|10|15|20|30|60
--rotate-widescreen-keys
--no-rotate-widescreen-keys
--midi-synth host|ma3|ma5
--bluetooth-backend off|virtual-ip
--bluetooth-role host|client
--bluetooth-local-name <name>
--bluetooth-host <host>
--bluetooth-port <port>

Example:

java -jar target/ReMEXA-Nightly.jar --host-scale 3 --frame-rate 30 --run-jad path/to/app.jad

References / Licenses

ReMEXA is licensed under the GNU General Public License v3.0. This project is informed by public research and open-source emulator/runtime projects in the Java ME and Japanese feature-phone preservation space. Check each upstream project's current license before copying or porting code.

• SquirrelJME - Java ME VM and preservation project.
• openDoJa - DoJa 5.1 runtime reimplementation.
• FreeJ2ME-Plus - J2ME emulator source reference.
• KEmulator nnmod - KEmulator-derived J2ME emulator reference.
• vavi-sound - Java sound, MFi, and SMAF reference work.
• smaf825 - SMAF/MMF playback and dump reference.