<s>
This	O
article	O
provides	O
non-exhaustive	O
lists	O
of	O
Java	B-Language
SE	I-Language
Java	B-Language
virtual	I-Language
machines	I-Language
(	O
JVMs	B-Language
)	O
.	O
</s>
<s>
It	O
does	O
not	O
include	O
every	O
Java	B-Language
ME	I-Language
vendor	O
.	O
</s>
<s>
Note	O
that	O
Java	B-Language
EE	I-Language
runs	O
on	O
the	O
standard	O
Java	B-Language
SE	I-Language
JVM	B-Language
but	O
that	O
some	O
vendors	O
specialize	O
in	O
providing	O
a	O
modified	O
JVM	B-Language
optimized	O
for	O
Java	B-Language
EE	I-Language
applications	O
.	O
</s>
<s>
Much	O
Java	O
development	O
work	O
takes	O
place	O
on	O
Windows	B-Application
,	O
Solaris	B-Application
,	O
Linux	B-Application
,	O
and	O
FreeBSD	B-Operating_System
,	O
primarily	O
with	O
the	O
Oracle	B-Application
JVMs	B-Language
.	O
</s>
<s>
Note	O
the	O
further	O
complication	O
of	O
different	O
32-bit/64	O
-bit	O
varieties	O
.	O
</s>
<s>
The	O
primary	O
reference	O
Java	B-Language
VM	I-Language
implementation	O
is	O
HotSpot	B-Language
,	O
produced	O
by	O
Oracle	B-Application
Corporation	I-Application
and	O
many	O
other	O
big	O
and	O
medium-sized	O
companies	O
(	O
e.g.	O
</s>
<s>
IBM	O
,	O
Redhat	O
,	O
Microsoft	O
,	O
Azul	O
,	O
SAP	B-Application
)	O
.	O
</s>
<s>
Eclipse	B-Language
OpenJ9	I-Language
open-source	O
from	O
IBM	B-Language
J9	I-Language
,	O
for	O
AIX	O
,	O
Linux	B-Application
(	O
x86	B-Operating_System
,	O
Power	O
,	O
and	O
Z	O
)	O
,	O
macOS	O
,	O
Windows	B-Application
,	O
MVS	O
,	O
OS/400	O
,	O
Pocket	O
PC	O
,	O
z/OS	O
.	O
</s>
<s>
GraalVM	B-Language
is	O
based	O
on	O
HotSpot/OpenJDK	O
,	O
it	O
has	O
a	O
polyglot	O
feature	O
,	O
to	O
transparently	O
mix	O
and	O
match	O
supported	O
languages	O
.	O
</s>
<s>
HotSpot	B-Language
the	O
open-source	O
Java	B-Language
VM	I-Language
implementation	O
by	O
Oracle	B-Application
.	O
</s>
<s>
Jikes	B-Language
RVM	I-Language
(	O
Jikes	B-Language
Research	I-Language
Virtual	I-Language
Machine	I-Language
)	O
research	O
project	O
.	O
</s>
<s>
PPC	B-Architecture
and	O
IA-32	B-Device
.	O
</s>
<s>
Supports	O
Apache	B-Application
Harmony	I-Application
and	O
GNU	O
Classpath	O
libraries	O
.	O
</s>
<s>
Eclipse	B-License
Public	I-License
License	I-License
.	O
</s>
<s>
leJOS	B-Language
Robotics	O
suite	O
,	O
a	O
firmware	O
replacement	O
for	O
Lego	B-Application
Mindstorms	I-Application
programmable	O
bricks	O
,	O
provides	O
a	O
Java	O
programming	O
environment	O
for	O
the	O
Lego	B-Application
Mindstorms	I-Application
RCX	O
and	O
NXT	B-Application
robots	O
.	O
</s>
<s>
Maxine	B-Language
meta-circular	O
open	O
source	O
research	O
VM	O
from	O
Oracle	B-Application
Labs	O
and	O
the	O
University	O
of	O
Manchester	O
.	O
</s>
<s>
Apache	B-Application
Harmony	I-Application
supports	O
several	O
architectures	O
and	O
systems	O
.	O
</s>
<s>
Apache	B-Application
License	I-Application
2.0	O
.	O
</s>
<s>
GCJ	O
the	O
GCC	B-Application
Java	O
compiler	O
,	O
that	O
compiles	O
either	O
to	O
bytecode	O
or	O
to	O
native	O
machine	O
code	O
.	O
</s>
<s>
As	O
of	O
GCC	B-Application
7	O
,	O
gcj	O
and	O
associated	O
libjava	O
runtime	O
library	O
have	O
been	O
removed	O
from	O
GCC	B-Application
.	O
</s>
<s>
IKVM.NET	B-Language
Java	O
for	O
Mono	B-Application
and	O
the	O
Microsoft	O
.NET	O
Framework	O
.	O
</s>
<s>
Uses	O
OpenJDK	B-Language
.	O
</s>
<s>
Zlib	B-License
License	I-License
.	O
</s>
<s>
JamVM	B-Language
developed	O
to	O
be	O
an	O
extremely	O
small	O
virtual	O
machine	O
.	O
</s>
<s>
Uses	O
GNU	O
Classpath	O
and	O
OpenJDK	B-Language
.	O
</s>
<s>
JOP	B-Language
hardware	O
implementation	O
of	O
the	O
JVM	B-Language
.	O
</s>
<s>
Juice	B-Language
JavaME	B-Language
experimental	O
JVM	B-Language
developed	O
to	O
run	O
on	O
the	O
NUXI	O
operating	O
system	O
.	O
</s>
<s>
Jupiter	B-Language
uses	O
Boehm	B-Language
garbage	I-Language
collector	I-Language
and	O
GNU	O
Classpath	O
.	O
</s>
<s>
Kaffe	B-Language
uses	O
GNU	O
Classpath	O
.	O
</s>
<s>
Mika	B-Language
VM	I-Language
intended	O
for	O
use	O
in	O
embedded	O
devices	O
.	O
</s>
<s>
BSD-style	B-License
licence	I-License
.	O
</s>
<s>
NanoVM	B-Language
developed	O
to	O
run	O
on	O
the	O
Atmel	B-Architecture
AVR	I-Architecture
ATmega8	B-Architecture
used	O
in	O
the	O
Asuro	O
Robot	O
,	O
can	O
be	O
ported	O
to	O
other	O
AVR-based	O
systems	O
.	O
</s>
<s>
SableVM	B-Language
first	O
free	O
software	O
JVM	B-Language
to	O
support	O
JVMDI	B-Language
and	O
JDWP	O
.	O
</s>
<s>
Squawk	B-Language
virtual	I-Language
machine	I-Language
a	O
Java	B-Language
ME	I-Language
VM	O
for	O
embedded	O
systems	O
and	O
small	O
devices	O
.	O
</s>
<s>
SuperWaba	B-Language
Java-like	O
virtual	O
machine	O
for	O
portable	O
devices	O
.	O
</s>
<s>
TakaTuka	B-Device
for	O
wireless	B-Architecture
sensor	I-Architecture
network	I-Architecture
devices	O
.	O
</s>
<s>
TinyVM	B-Language
.	O
</s>
<s>
VMKit	O
of	O
LLVM	B-Application
.	O
</s>
<s>
Wonka	B-Language
VM	I-Language
developed	O
to	O
run	O
on	O
Acunia	O
's	O
ARM-based	O
hardware	O
.	O
</s>
<s>
BSD-style	B-License
licence	I-License
.	O
</s>
<s>
No	O
longer	O
under	O
active	O
development	O
,	O
superseded	O
by	O
Mika	B-Language
VM	I-Language
.	O
</s>
<s>
Some	O
JVM	B-Language
's	O
are	O
intended	O
to	O
run	O
without	O
an	O
underlying	O
OS	O
.	O
</s>
<s>
JX	B-Language
Java	O
operating	O
system	O
that	O
focuses	O
on	O
a	O
flexible	O
and	O
robust	O
operating	O
system	O
architecture	O
developed	O
as	O
an	O
open	O
source	O
system	O
by	O
the	O
University	O
of	O
Erlangen	O
.	O
</s>
<s>
Azul	O
Platform	O
Prime	O
a	O
fully	O
compliant	O
,	O
high-performance	O
Java	B-Language
virtual	I-Language
machine	I-Language
based	O
on	O
OpenJDK	B-Language
that	O
uses	O
Azul	O
Systems	O
's	O
C4	O
garbage	O
collector	O
and	O
Falcon	O
JIT	O
compiler	O
.	O
</s>
<s>
JamaicaVM	B-Language
(	O
aicas	O
)	O
a	O
hard	O
real-time	O
Java	B-Language
VM	I-Language
for	O
embedded	O
systems	O
.	O
</s>
<s>
Excelsior	B-Language
JET	I-Language
a	O
licensed	O
Java	B-Language
SE	I-Language
implementation	O
with	O
AOT	B-Application
compiler	I-Application
for	O
Windows	B-Application
,	O
OS	O
X	O
,	O
and	O
Linux	B-Application
on	O
Intel	B-Operating_System
x86	I-Operating_System
and	O
Linux	B-Application
on	O
32-bit	O
ARM	B-Architecture
.	O
</s>
<s>
Jinitiator	B-Language
developed	O
by	O
Oracle	B-Application
before	O
they	O
purchased	O
Sun	O
.	O
</s>
<s>
Designed	O
to	O
improve	O
support	O
for	O
Oracle	B-Application
Forms	I-Application
in	O
web	O
sites	O
.	O
</s>
<s>
JRockit	B-Language
(	O
originally	O
from	O
Appeal	B-Application
Virtual	I-Application
Machines	I-Application
)	O
acquired	O
by	O
Oracle	B-Application
for	O
Linux	B-Application
,	O
Windows	B-Application
and	O
Solaris	B-Application
.	O
</s>
<s>
Mac	B-Language
OS	I-Language
Runtime	I-Language
for	I-Language
Java	I-Language
(	O
MRJ	O
)	O
.	O
</s>
<s>
Microsoft	B-Language
Java	I-Language
Virtual	I-Language
Machine	I-Language
discontinued	O
in	O
2001	O
.	O
</s>
<s>
Blackdown	B-Language
Java	I-Language
was	O
a	O
licensed	O
port	O
to	O
Linux	B-Application
of	O
the	O
reference	O
SunSoft	O
implementation	O
.	O
</s>
<s>
It	O
was	O
discontinued	O
in	O
2007	O
,	O
after	O
OpenJDK	B-Language
became	O
available	O
.	O
</s>
<s>
Sun	O
CVM	O
CVM	O
originally	O
standing	O
for	O
"	O
Compact	O
Java	B-Language
Virtual	I-Language
Machine	I-Language
"	O
.	O
</s>
<s>
Gemstone	B-Operating_System
modified	O
for	O
Java	B-Language
EE	I-Language
features	O
(	O
application	O
DBMS	O
)	O
.	O
</s>
<s>
PreonVM	B-Language
a	O
Java	B-Language
VM	I-Language
for	O
embedded	O
systems	O
and	O
small	O
and	O
resource	O
constrained	O
devices	O
.	O
</s>
