JAVA is a multi-platform programming language, so it would be great to have such a tool working on the Gumstix. There are two different ways to support JAVA on the GUMSTIX:

• Native GCJ compiler - it is possibly to select to include this compiler while building buildroot revision, but it has a big problem which is that Gumstix needs the library libgcj and its big size - more than 8MB - and the lack of free space available at the Gumstix makes this compiler almost non-usable for Gumstices without a Compact Flash expansion card.
• JAVA Virtual Machine - don't need the libgcj library and consequently require less space. It is possibly to install a version with no symbols (around 150K on PowerPC and 110K on Intel). Virtual machines on Gumstix:

1. JamVM !
2. Wonka
3. Kaffe

To make JVM (in this case JamVM) working, one has to install jamvm, classpath and enable zlib . Then just copy Test.class file and run it using jamvm command:

Testing JVM

Filesystem image with JVM is about 10.8 MB, what with comparison with one without JVM - 3.5 MB - takes much space.

Dependencies:

• classpath-0.93 ->

• ----jikes-1.22.1

• ----gtk+-2.10.9 ->

• --------glib-2.12.9

• --------pango-1.14.9

• --------cairo-1.2.6

• --------atk-1.9.1

• --------tiff-3.8.2

• ----GConf-2.16.1 ->

• --------ORBit2-2.12.5 ->

• ------------libIDL-0.8.7

• jdk-6-linux-i586

• jamvm-1.4.5

Installation:

• jdk-6-linux-i586

self extracting binary file

• classpath-0.93

CC=/usr/local/gumstix-buildroot/build_arm_nofpu/staging_dir/bin/arm-linux-gcc
./configure --host=arm-linux --disable-gtk-peer --disable-plugin --with-jikes
make
make install

• jamvm-1.4.5

CC=/usr/local/gumstix-buildroot/build_arm_nofpu/staging_dir/bin/arm-linux-gcc
./configure --host=arm-linux
make
make install

References

http://www.cs.gmu.edu/~eclab/projects/robots/flockbots/pmwiki.php?n=Main.Java