<s>
A	O
Java	B-Language
processor	I-Language
is	O
the	O
implementation	O
of	O
the	O
Java	B-Language
virtual	I-Language
machine	I-Language
(	O
JVM	B-Language
)	O
in	O
hardware	O
.	O
</s>
<s>
In	O
other	O
words	O
,	O
the	O
Java	B-Language
bytecode	I-Language
that	O
makes	O
up	O
the	O
instruction	O
set	O
of	O
the	O
abstract	O
machine	O
becomes	O
the	O
instruction	O
set	O
of	O
a	O
concrete	O
machine	O
.	O
</s>
<s>
These	O
were	O
the	O
most	O
popular	O
form	O
of	O
a	O
high-level	B-Architecture
language	I-Architecture
computer	I-Architecture
architecture	I-Architecture
,	O
and	O
were	O
"	O
an	O
attractive	O
choice	O
for	O
building	O
embedded	O
and	O
real-time	O
systems	O
that	O
are	O
programmed	O
in	O
Java	O
"	O
.	O
</s>
<s>
There	O
are	O
several	O
research	O
Java	B-Language
processors	I-Language
tested	O
on	O
FPGA	B-Architecture
,	O
including	O
:	O
</s>
<s>
picoJava	B-Language
was	O
the	O
first	O
attempt	O
to	O
build	O
a	O
Java	B-Language
processor	I-Language
,	O
by	O
Sun	O
Microsystems	O
.	O
</s>
<s>
Its	O
successor	O
picoJava-II	O
was	O
freely	O
available	O
under	O
the	O
Sun	B-License
Community	I-License
Source	I-License
License	I-License
,	O
and	O
is	O
still	O
available	O
from	O
some	O
archives	O
.	O
</s>
<s>
Java	B-Language
Optimized	I-Language
Processor	I-Language
for	O
FPGAs	B-Architecture
.	O
</s>
<s>
The	O
aJile	O
processor	O
was	O
the	O
most	O
successful	O
ASIC	O
Java	B-Language
processor	I-Language
.	O
</s>
