Which Java JRE?

Arigead captain.deadly at gmail.com
Thu Nov 26 16:06:35 CET 2009

Hello all,
    I'm working on a project and I think it'd be cool as to show off the
project's work on a phone. The OpenMoko phone ;-)

Unfortunately the project is implemented in Java, which I'm no fan of on
anything but a web server or browser but that's a discussion for another

I tried our system, which is running in an OSGi Container, on Jamvm on
the OpenMoko. It works but it sucks up 95% of the CPU when it's idle.
Not Good! I tried the same on my eeePC and with Sun's JRE our system
uses 1% of CPU whilst JamVM on the eeePC uses 40%. Obviously JamVM does
not suit our system.

So I was thinking of taking a look at one of Sun's ARM JRE's but I'm a
bit confused by the CPU in the FreeRunner. I've read that it's an
ARM920T core which uses the ARMv4 Instruction set and is ARM7 Binary
Compatible. I'm totally confused as to whether this means I need an
Arm4, 7, or 9 JRE. Sun don't have too many JRE's for ARM so I'm probably
not going to get one that suits. I might try Cacao.

If anybody could advise me which ARM Jre I need I'd be very greatful.

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