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How to build a simple java virtual machine for the chumby (assumes you have the development tools installed):

Building JamVM

Create a directory to hold the package

mkdir ~jamvm
cd jamvm

Download the source code

Go here and download the source code into ~/jamvm

Unpack the source code

tar xzvf java-1.4.3.tar.gz
cd javavm-1.4.3

Configure and build

./configure  --build=i386-linux --host=arm-linux --prefix=/usr/arm-linux

Strip the binary

arm-linux-strip src/jamvm


sudo make install

This will copy the virtual machine to /usr/arm-linux/jamvm, and the basis class libraries to /usr/arm-linux/share/