embedded systems

[shoe-private]

I wonder, what exactly are the minimal requirements to a java runtime for executing your openHAB2 framework. I've tried (naively) to run it with ejre(oracle), which was configured with a compact1 profile. Obviously it has failed, due to missing dependencies (SAX-Parser). I doubt the adventure to modularize a monolithic solution like java, myself.

I try to figure out, whether a hardware platform arm/sflt 400MHz 64MB of RAM and <50MB flash would be suitable for it? Besides, this platform bundles a lot of wireless modules, that's why it became interesting for us.

So I expect the minimal hardware requirements would be widely above the 64MB of RAM or Flash, especially when I look forward into productive environment beyond a minimal solution as presently available. And there is no chance to reduce those requirements, or am I to doubtful?

[kaikreuzer]

Hi Soeren,

At the moment, JavaSE 7/8 is a pre-requisite. My goal is to have Java8 compact profile 2 as a minimal requirement in the end (for the minimal runtime without DSL-support) - you can read a bit about this at http://www.oraclejavamagazine-digital.com/javamagazine_Twitter/20141112Twitter#pg49.
Nonetheless, I doubt that a system with the specs that you mention will be capable of running it. If it is running fast and smooth on a RaspPi, I would already be happy - see #38.
Note that if you are thinking about a commercial solution, you should anyhow rather build your own solution based on Eclipse SmartHome - i.e. you can choose a more lightweight OSGi container (openHAB's Equinox is not really made for embedded use) and also a leaner HTTP server than Jetty. This could already help you reducing the footprint as well (but you might have to go for commercial implementations of them).