Well,
I consider that if java can run on a nintendo DS … then Vassal could do it too !!
Just look at the homebrew …
blog.davr.org/2007/08/08/java-for-nds/
May be a way to glance and for leisure developer’s time 
Thus spake “soft-bug”:
Looks neat, if someone wants to try it. I have no Nintendo DS.
–
J.
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Joel,
I just have tested and it works … (i sware i do not have stolen my son’s DS console !!!)
You only have to select a class file and you can launch it by and user interface …
Now my problem is to do the same with Vassal !!! 
If i take the manual installation package 3.0… how to convert this in class files ??? I have plenty of jar files …
Thus spake “soft-bug”:
The JARs are just ZIP files with some extra metadata in the META-INF
directory. All you’d need to do is unzip them. to get the class files.
J.
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Ok … do i must respect the file directory breakdown structure ??? or i can put all unzip files at the root ???
If all is unziped what is the first file to launch ???
I have also found :
The DsLinux operating system …
Thus spake “soft-bug”:
The roots of all the JARS should be merged together, but you must leave
all of the structure within each JAR the way it is.
J.
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Awesome, I have a Ds and a flash cart so if anyone wants me to test any files feel free to ask 
You are welcome !!!
I’m also a simple Vassal User like you … 
Well i join here the file directory picture after the massive unzip process :
(i have a R4 Revolution Flash …)
-
The Java DS requires a class file as a launcher and there’s nothing like this at the root of the Flash Card
-
I don’t know if the Java DS can manage a file breakdown structure … because of 1)
…
I have installed DSLinux … all working (linux) but the wiki say :
Is it possible to run all Linux software?
To port an application, the source code must be available and be compiled as a binary for DSLinux and the DS processor. If it’s a text app that runs under the console you will probably be able to port it but for graphical apps it’s improbable due to memory constraints.
…
Thus spake “soft-bug”:
How much memory does a DS have, anyway?
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J.
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Not sure but I know you can buy Ram packs to go in GBA slot, though I think it’s possible to dump the info onto the flash cart, no idea how though 