<s>
Real	B-Language
time	I-Language
Java	I-Language
is	O
a	O
catch-all	O
term	O
for	O
a	O
combination	O
of	O
technologies	O
that	O
enables	O
programmers	O
to	O
write	O
programs	O
that	O
meet	O
the	O
demands	O
of	O
real-time	B-General_Concept
systems	I-General_Concept
in	O
the	O
Java	B-Language
programming	I-Language
language	I-Language
.	O
</s>
<s>
Java	B-Language
's	O
sophisticated	O
memory	B-General_Concept
management	I-General_Concept
,	O
native	O
support	O
for	O
threading	B-Operating_System
and	O
concurrency	O
,	O
type	B-Language
safety	I-Language
,	O
and	O
relative	O
simplicity	O
have	O
created	O
a	O
demand	O
for	O
its	O
use	O
in	O
many	O
domains	O
.	O
</s>
<s>
Real	B-Language
time	I-Language
Java	I-Language
supports	O
a	O
strict	O
priority-based	B-Operating_System
threading	B-Operating_System
model	O
,	O
</s>
<s>
The	O
initial	O
for	O
an	O
open	O
standard	O
for	O
real-time	B-Language
Java	I-Language
was	O
put	O
forth	O
by	O
Kelvin	O
Nilsen	O
,	O
then	O
serving	O
as	O
a	O
research	O
faculty	O
member	O
at	O
Iowa	O
State	O
University	O
.	O
</s>
<s>
The	O
overwhelmingly	O
positive	O
response	O
to	O
these	O
early	O
proposals	O
resulted	O
in	O
a	O
series	O
of	O
meetings	O
hosted	O
by	O
the	O
National	O
Institute	O
of	O
Standards	O
and	O
Technology	O
in	O
an	O
effort	O
to	O
establish	O
an	O
open	O
standard	O
for	O
real-time	B-Language
Java	I-Language
.	O
</s>
<s>
NIST	O
was	O
ultimately	O
told	O
that	O
they	O
were	O
not	O
the	O
appropriate	O
body	O
to	O
establish	O
standards	O
related	O
to	O
the	O
Java	B-Language
language	I-Language
,	O
as	O
Java	B-Language
was	O
trademarked	O
,	O
and	O
the	O
technologies	O
were	O
owned	O
by	O
Sun	O
Microsystems	O
.	O
</s>
<s>
When	O
the	O
Java	B-Language
Community	I-Language
was	O
formed	O
,	O
the	O
very	O
first	O
effort	O
was	O
the	O
specification	O
for	O
real-time	B-Language
Java	I-Language
,	O
JSR001	O
.	O
</s>
<s>
A	O
number	O
of	O
implementations	O
of	O
the	O
resulting	O
Real-time	B-Language
specification	I-Language
for	I-Language
Java	I-Language
(	O
RTSJ	B-Language
)	O
have	O
emerged	O
,	O
including	O
a	O
reference	O
implementation	O
from	O
Timesys	O
,	O
IBM	O
's	O
WebSphere	O
Real	O
Time	O
,	O
Sun	O
Microsystems	O
's	O
Java	B-Language
SE	O
Real-Time	B-General_Concept
Systems	I-General_Concept
,	O
PTC	O
Perc	O
from	O
PTC	O
,	O
Inc.	O
,	O
or	O
JamaicaVM	B-Language
from	O
aicas	O
.	O
</s>
<s>
The	O
RTSJ	B-Language
addressed	O
the	O
critical	O
issues	O
by	O
mandating	O
a	O
minimum	O
specification	O
for	O
the	O
threading	B-Operating_System
model	O
(	O
and	O
allowing	O
other	O
models	O
to	O
be	O
plugged	O
into	O
the	O
VM	O
)	O
and	O
by	O
providing	O
for	O
areas	O
of	O
memory	O
that	O
are	O
not	O
subject	O
to	O
garbage	O
collection	O
,	O
along	O
with	O
threads	B-Operating_System
that	O
are	O
not	O
preemptable	O
by	O
the	O
garbage	O
collector	O
.	O
</s>
<s>
These	O
areas	O
are	O
instead	O
managed	O
using	O
region-based	B-General_Concept
memory	I-General_Concept
management	I-General_Concept
.	O
</s>
<s>
The	O
Real-Time	B-Language
Specification	I-Language
for	I-Language
Java	I-Language
(	O
RTSJ	B-Language
)	O
is	O
a	O
set	O
of	O
interfaces	B-Application
and	O
behavioral	O
refinements	O
that	O
enable	O
real-time	B-General_Concept
computer	B-General_Concept
programming	I-General_Concept
in	O
the	O
Java	B-Language
programming	I-Language
language	I-Language
.	O
</s>
<s>
RTSJ	B-Language
1.0	O
was	O
developed	O
as	O
JSR	B-Language
1	I-Language
under	O
the	O
Java	B-Language
Community	I-Language
Process	I-Language
,	O
which	O
approved	O
the	O
new	O
standard	O
in	O
November	O
,	O
2001	O
.	O
</s>
<s>
RTSJ	B-Language
2.0	O
is	O
being	O
developed	O
under	O
JSR	B-Language
282	I-Language
.	O
</s>
