May I know how does it work?

[naasif08]

Hello, I have one thing to know. Does your jvm jenerate firmware or just it has been flashed first like a OS and somehow feed the jvm Main.Java. I would really love to know about that, thank you :)

[ElectricThanhTung]

Hi @naasif08
Sorry for the late reply.
It does generate firmware. FlintJVM has to be flashed onto the board first and you can say it works like an OS.
The java program will be compiled into a class file as usual by your compiler (cross-compilation) and it will be uploaded to the ESP32 board as a file (vscocde will do this when you press the start debug button). FlintJVM will read the class file directly and execute it.

[naasif08]

Thank you for your reply. I just curious to ask that if I use lambda expression and other features, will it be fetched by the FlintJVM?

[ElectricThanhTung]

The invokedynamic instruction is not supported by FlintJVM yet so you cannot use lambda at the moment. If this instruction is encountered while executing bytecode FlintJVM will throw an UnsupportedOperation exception.

[ElectricThanhTung]

I am also trying to implement this instruction but I still don’t really understand how it works.

[naasif08]

Lambda uses single method interface, it's complex to feed ESP32 and you are working on a complex project. Keeping it simple is good idea I think. Good luck!