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Latest version is JamVM 2.0.0, released on 30th July 2014. JamVM is compatible with the class-library from OpenJDK 6, 7 and 8 (the latest).

http://jamvm.sourceforge.net/

http://www.gnu.org/software/classpath/

I backport jamvm and classpath to current version.

First remove old one if it is installed.

opkg remove jamvm
opkg remove classpath

cd /mnt/sda1
wget -O  classpath_0.99-1_ar71xx.ipk https://www.dropbox.com/s/fgijxd8o8pmn2x1/classpath_0.99-1_ar71xx.ipk?dl=0 --no-check-certificate
wget -O  jamvm_2.0.0-1_ar71xx.ipk https://www.dropbox.com/s/r3vova5k09lmft1/jamvm_2.0.0-1_ar71xx.ipk?dl=0 --no-check-certificate

opkg install classpath_0.99-1_ar71xx.ipk
opkg install jamvm_2.0.0-1_ar71xx.ipk

Test jamvm installation.

root@Arduino:~# jamvm -version
java version "1.5.0"
JamVM version 2.0.0
...
Execution Engine: direct-threaded interpreter with stack-caching
Compiled with: gcc 4.6.3 20120201 (prerelease)
Boot Library Path: /usr/lib/classpath
Boot Class Path: /usr/share/jamvm/classes.zip:/usr/share/classpath/glibj.zip