<s>
Excelsior	B-Language
JET	I-Language
is	O
a	O
now-defunct	O
proprietary	O
Java	B-Language
SE	I-Language
technology	O
implementation	O
built	O
around	O
an	O
ahead-of-time	B-Application
(	O
AOT	B-Application
)	O
Java	B-Language
to	O
native	B-Language
code	I-Language
compiler	O
.	O
</s>
<s>
The	O
compiler	O
transforms	O
the	O
portable	B-Architecture
Java	B-Language
bytecode	O
into	O
optimized	O
executables	O
for	O
the	O
desired	O
hardware	O
and	O
operating	B-General_Concept
system	I-General_Concept
(	O
OS	O
)	O
.	O
</s>
<s>
Also	O
included	O
are	O
a	O
Java	B-Language
runtime	O
featuring	O
a	O
just-in-time	O
(	O
JIT	O
)	O
compiler	O
for	O
handling	O
classes	O
that	O
were	O
not	O
precompiled	O
for	O
whatever	O
reason	O
(	O
e.g.	O
</s>
<s>
third-party	O
plugins	O
or	O
dynamic	O
proxies	O
)	O
,	O
the	O
complete	O
Java	B-Language
SE	I-Language
API	B-General_Concept
implementation	O
licensed	O
from	O
Oracle	B-Application
,	O
and	O
a	O
toolkit	O
to	O
aid	O
deployment	O
of	O
the	O
optimized	O
applications	O
.	O
</s>
<s>
Excelsior	B-Language
JET	I-Language
is	O
developed	O
by	O
Excelsior	O
LLC	O
,	O
headquartered	O
in	O
Novosibirsk	O
,	O
Russia	O
.	O
</s>
<s>
Excelsior	B-Language
JET	I-Language
has	O
passed	O
the	O
"	O
official	O
"	O
test	O
suite	O
(	O
TCK	O
)	O
for	O
Java	B-Language
SE	I-Language
8	O
,	O
and	O
is	O
certified	O
Java	B-Language
Compatible	O
on	O
macOS	B-Application
and	O
a	O
number	O
of	O
Windows	B-Application
and	O
Linux	B-Application
flavors	O
running	O
on	O
Intel	B-Operating_System
x86	I-Operating_System
,	O
AMD64/Intel	B-Device
64	I-Device
and	O
compatible	O
hardware	O
.	O
</s>
<s>
(	O
The	O
macOS	B-Application
version	O
is	O
64-bit	O
only	O
.	O
)	O
</s>
<s>
The	O
Enterprise	O
Edition	O
supports	O
the	O
Equinox	B-Language
OSGi	I-Language
runtime	O
at	O
the	O
JVM	O
level	O
,	O
enabling	O
ahead-of-time	B-Application
compilation	I-Application
of	O
Eclipse	O
RCP	O
(	O
Rich	B-Architecture
Client	I-Architecture
Platform	I-Architecture
)	O
applications	O
,	O
and	O
version	O
7.0	O
added	O
such	O
support	O
for	O
Web	B-Application
applications	I-Application
running	O
on	O
Apache	B-Language
Tomcat	I-Language
.	O
</s>
<s>
Excelsior	B-Language
JET	I-Language
Embedded	O
implements	O
the	O
technology	O
in	O
a	O
very	O
similar	O
manner	O
.	O
</s>
<s>
The	O
only	O
major	O
differences	O
used	O
to	O
be	O
in	O
licensing	O
and	O
pricing	O
,	O
but	O
as	O
of	O
the	O
latest	O
version	O
Excelsior	B-Language
JET	I-Language
Embedded	O
also	O
supports	O
ARM-based	O
platforms	O
.	O
</s>
<s>
Version	O
15	O
introduced	O
incremental	O
compilation	O
for	O
AMD64	B-Device
and	O
ARM	B-Architecture
targets	O
and	O
improved	O
application	O
performance	O
across	O
all	O
platforms	O
.	O
</s>
<s>
On	O
May	O
15	O
,	O
2019	O
,	O
Excelsior	O
announced	O
discontinuation	O
of	O
Excelsior	B-Language
JET	I-Language
in	O
an	O
e-mail	O
to	O
their	O
customers	O
and	O
next	O
day	O
also	O
on	O
their	O
website	O
.	O
</s>
