Re: Real time Java? Huh?

[oopster@my-dejanews.com]

In article <3642a327.38883600@news.nmia.com>,
  joconnor@roadrunner.com wrote:
> On Thu, 05 Nov 1998 21:36:10 -0800, Joseph <**********@*******.**>
> wrote:
>
> >I missed way too much of this thread.   Java as a real time language?
> >Tell me that this is a hoax, please.
>
> That gist of it is that some companies are breaking with Sun and
> trying to establish a standard for Java in real time systems.

More accurately, the gist is that Sun has a proposed standard for real-time
Java, and a group of other companies has also formed a consortium to promote
a somewhat different realtime Java standard.  The main issue seems to be the
licensing terms for Sun Embedded Java.

HP has already produced a competing embedded Java VM, which they are also
licensing to other companies.

> I remember being at a Alsys demonstration once where one of the Ada
> compiler writers warned against using exception handling in hard real
> time systems because you couldn't guarantee how long it would take to
> unwind to find the handler for the raised exception.  I wonder if such
> conditions esist for exception handling in Java?  (Or dynamic
> dispatch, for that matter)

Is it still the case that Ada exceptions are to be avoided for real-time?
Not a good thing if true...

It seems clear that deterministic exception handling will be critical to
real-time Java efforts.  I'm sure you can find out more about this at the
various real-time Java websites if you're interested.

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