Java on Wii: Not Possible

You cannot run Java on a stock Wii.

Technical Reasons

• No JVM: Wii OS (IOS) has no Java Virtual Machine. Porting one would require massive effort (JIT, GC, class libraries) for minimal gain.
• Hardware constraints: 729 MHz PowerPC (Broadway), 88 MB MEM1/MEM2, no MMU in game mode — tight for modern JVM.
• Security model: Wii's chain of trust (boot0 → boot1 → boot2 → IOS → Game) only runs signed code. Unsigned Java apps won't launch.

Homebrew Alternative (Requires CFW)

• Wii Homebrew Channel (via LetterBomb, BlueBomb, str2hax) → runs C/C++ homebrew (emulators, media players, games).
• No viable Java homebrew exists for Wii. Devs use devkitPPC (C/C++).

If You Want to Run Java Code

• PC / Mac / Linux / Android / Phone — Install JDK/JRE, run anywhere.
• Virtual Machine: VirtualBox / VMware / UTM → Linux VM → Java.
• Raspberry Pi 4/5 — $50–$80, runs Java perfectly, HDMI out, USB controllers.

The Wii is a fixed-function game appliance. General-purpose runtimes (Java, Python, Node) aren't feasible on it.