<s>
JX	B-Language
is	O
a	O
microkernel	B-Operating_System
operating	B-General_Concept
system	I-General_Concept
with	O
both	O
the	O
kernel	B-Operating_System
and	O
applications	O
implemented	O
using	O
the	O
Java	B-Language
programming	I-Language
language	I-Language
.	O
</s>
<s>
JX	B-Language
is	O
implemented	O
as	O
an	O
extended	O
Java	B-Language
virtual	I-Language
machine	I-Language
(	O
the	O
JX	B-Language
Core	O
)	O
,	O
adding	O
support	O
to	O
the	O
Java	B-Language
system	O
for	O
necessary	O
features	O
such	O
as	O
protection	O
domains	O
and	O
hardware	O
access	O
,	O
along	O
with	O
a	O
number	O
of	O
components	O
written	O
in	O
Java	B-Language
that	O
provide	O
kernel	B-Operating_System
facilities	O
to	O
applications	O
running	O
on	O
the	O
computer	O
.	O
</s>
<s>
Because	O
Java	B-Language
is	O
a	O
type-safe	B-Language
language	O
,	O
JX	B-Language
is	O
able	O
to	O
provide	O
isolation	O
between	O
running	O
applications	O
without	O
needing	O
to	O
use	O
hardware	O
memory	O
protection	O
.	O
</s>
<s>
This	O
technique	O
,	O
known	O
as	O
language-based	B-Operating_System
protection	I-Operating_System
means	O
that	O
system	O
calls	O
and	O
inter-process	B-Operating_System
communication	I-Operating_System
in	O
JX	B-Language
does	O
not	O
cause	O
an	O
address	O
space	O
switch	O
,	O
an	O
operation	O
which	O
is	O
slow	O
on	O
most	O
computers	O
.	O
</s>
<s>
JX	B-Language
runs	O
on	O
standard	O
PCs	O
,	O
with	O
support	O
for	O
a	O
limited	O
range	O
of	O
common	O
hardware	O
elements	O
.	O
</s>
<s>
It	O
is	O
free	B-Application
software	I-Application
,	O
developed	O
by	O
the	O
University	O
of	O
Erlangen	O
.	O
</s>
<s>
The	O
primary	O
benefits	O
of	O
JX	B-Language
include	O
:	O
</s>
