javm-nx-poc

This is a WIP Java ecosystem PoC for Nintendo Switch homebrew using libjavm VM library.

It is a very basic example of how an ecosystem to run Java on Nintendo Switch (via homebrew) would work.

JAR files can directly be ran if the prepared files in sd_out are present in the SD card.

In order to use this project:

• Clone (recursively) this repo

• Build javm (just needs devkitA64). If the build process succeeds, javm.nro should have been copied to sd_out.

• Build the Java side of nx (needs maven, run mvn package in the directory)

• Build the java-hello-world example (same way ^)

• Copy manually the output JAR in /target to your SD card (anywhere, usually inside /switch) and the sd_out directory's contents to the root of your SD card.

• The example JAR should be launchable from hbmenu!

Parts of the ecosystem

- javm

The main executable which runs JARs (javm.nro <jar-file> <arguments...>)

Should be located at /switch/javm/javm.nro.

- SD layout (special files)

• JPG icon for JAR files: /switch/javm/jar-icon.jpg

• File association file for launching JARs from hbmenu: /config/nx-hbmenu/fileassoc/javm.cfg

- nx

Custom Java libraries, both a native C++ implementation and a stubbed JAR library for any projects using this ecosystem.

Sources are under nx/native for the C++/libjavm side and nx/java for the stubbed Java library. The Java side is compiled with maven.

Example

The hello world example is a Java version of the homebrew examples' hello world example, made to be compiled with maven.