> Oh no! I need to buy a $5 piece of hardware to run this Java code? What kind of nonsense is that?
4 GB per program absolutely destroys VM consolidation. I love the look on managers' faces when they ask for a 1 GB VM and I ask them, "Is this for a Java program?" :)
Imagine, Java is run on your phone's SIM card. Enough?
On other hand, on truly constrained embedded systems where real time is essential, no GC-based language has any business, no matter how GC is good. Even C++ is sometimes avoided.
Well 2 thing stand out for me from links you mentioned:
> The applications use a combination of Thales proprietary middleware written in C combined with Java code enabled by the Java™ Native Interface (JNI).
> AONIX has additionally delivered professional services to help PERC Ultra users at Thales optimize their applications and improve execution performance including, a customer-specific training course handled the needs of coding in Java™ with hard real time constraints.
Seems like with helping of C and Consulting on 'How to do Java right' they made it work.
> End-to-end distributed thread timing constraints measured from stimulus to response are typically under 100 ms.
Since it is slightly faster than typical (per char) typing speed on keyboard. It appears nice but terribly impressive real time Java use case.
> However, many Java language features are not supported by Java Card (in particular types char, double, float and long; the transient qualifier; enums; arrays of more than one dimension; finalization; object cloning; threads). Further, some common features of Java are not provided at runtime by many actual smart cards (in particular type int, which is the default type of a Java expression; and garbage collection of objects).
[EDIT] But I am not arguing with the overarching argument that Java proper can run efficiently on very constrained devices. It all depends on the implementation.
4 GB per program absolutely destroys VM consolidation. I love the look on managers' faces when they ask for a 1 GB VM and I ask them, "Is this for a Java program?" :)