Embedded linux-java

Question

does any1 know of an easy to learn distro thats used for embedded saystems with java.(pref open source)
also a pro distro name wud be useful for reference 2.

Answer 1

In my oppinion 2) is not an option. Actually in most cases it requires even more memory compared to the traditional case.
1) is ... well, I don't think that you will find enough good tool to seamlesly convert your code to C/C++. In all cases, there would be a lot of work needed after the 'conversion'
3) is a reasonable option. You can use J2ME CDC - which is something like stripped down J2SE. But yes, it still includes collections, core lang, io, security, reflection and util classes. It just don't have the GUI libraries like AWT, Swing; which I don't think you need on that embedded device.
So I bet on 3).
Here is some example that it works:
I had a HW - pentium/32RAM/floppy
The software configuration was:
Linux - monolitic kernel without modules loading support and only really required drivers compilled in.
The chosen filesystem was minix
The VM was J2ME CDC
The system software was busybox - used to boot the linux, to start a shell and start the VM.
The other software was: our embedded server - an OSGi Platform with minimal set of bundles, which included the HTTP & Telnet bundles.
All that software was created in a in 8MB image, compressed with bzip to 1.7M and written, under linux to a floppy disk /yes, the regular floppy disk can handle up to 2MB/
When the disk was ready, I placed it into the floppy and booted the machine. The system was up and running after some minutes because the floppy is really slow. At this time I had an HTTP server running and a remote console to the OSGi framework, so I can install remotely some other bundles. The 32MB memory was full almost to it's limit. But it already contained - a memory image of the disk == 8M, the linux kernel loaded, the virtual machine , the OSGi framework and the bundles (http, telnet & some other, ~ 10 bundles totaly).