Question 1

How do I run J2ME games on RetroArch with FreeJ2ME-Plus?

Accepted Answer

Build the libretro core using make or MSYS2, place freej2me-lr.jar in the system folder and the core file in cores, then load J2ME files through the frontend. The README provides detailed steps for Linux and Windows.

Question 2

FreeJ2ME-Plus vs KEmulator: which is better for old mobile games?

Accepted Answer

FreeJ2ME-Plus is open-source, cross-platform, and supports libretro integration, ideal for retro gaming setups. KEmulator is Windows-only and closed-source, better for quick, no-fuss emulation on Windows without extra dependencies.

Question 3

How to change key mappings in FreeJ2ME-Plus?

Accepted Answer

Use the keyLayout command-line argument or GUI settings to select from multiple device key layouts like Nokia, Motorola, or default. This ensures proper input mapping for different J2ME applications.

Question 4

Does FreeJ2ME-Plus save game progress?

Accepted Answer

Yes, it keeps savedata and config at the working directory it's run from. You can manage saves through the emulator's interface or by backing up the working directory files.

Question 5

What Java version do I need for FreeJ2ME-Plus?

Accepted Answer

It requires Java 6 or higher, as indicated by the badges in the README. Most modern Java installations (e.g., Java 8 or 11) should work fine.

Question 6

How to build FreeJ2ME-Plus from source on Windows?

Accepted Answer

Install Apache Ant and Java, then run 'ant' from the project directory. For the libretro core, use MSYS2 with mingw to compile, following the specific steps outlined in the README.

FreeJ2ME Plus

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