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# FreeJ2ME - RetroBIOS

Type | libretro
Classification | official_port
Source | https://github.com/hex007/freej2me
Version | GIT
Profiled | 2026-03-23
Cores | freej2me
Systems | j2me

Technical notes

The native core is a C bridge that spawns a Java process running freej2me-lr.jar, which handles all J2ME emulation. Communication happens over pipes (Linux) or named pipes (Windows). A Java runtime (JRE/JDK 8+) must be installed on the host. The jar is built from source via Apache Ant (build.xml). Same repo hosts standalone AWT and SDL2 frontends alongside the libretro frontend.

1 files | 1 required, 0 optional | 1 in repo, 0 missing

`freej2me-lr.jar` -required : FreeJ2ME libretro Java application

- System: j2me
- Source: `src/libretro/freej2me_libretro.c:483-486 (GET_SYSTEM_DIRECTORY + fill_pathname_join + java -jar)`
- Platforms: lakka, retroarch, retrobat, retrodeck, retropie
- Not a BIOS dump. Java emulator loaded by the native core at startup via execvp('java', '-jar', path). Built from source via 'ant'. Must be in the system directory root.

Generated on 2026-03-25T14:56:43Z