<s>
The	O
GNU	B-Language
Compiler	I-Language
for	I-Language
Java	I-Language
(	O
GCJ	O
)	O
is	O
a	O
discontinued	O
free	B-Application
compiler	B-Language
for	O
the	O
Java	B-Language
programming	I-Language
language	I-Language
.	O
</s>
<s>
It	O
was	O
part	O
of	O
the	O
GNU	B-Application
Compiler	I-Application
Collection	I-Application
.	O
</s>
<s>
GCJ	O
compiles	B-Language
Java	B-Language
source	I-Language
code	I-Language
to	O
Java	B-Language
virtual	I-Language
machine	I-Language
(	O
JVM	B-Language
)	O
bytecode	O
or	O
to	O
machine	B-Language
code	I-Language
for	O
a	O
number	O
of	O
CPU	B-General_Concept
architectures	I-General_Concept
.	O
</s>
<s>
It	O
could	O
also	O
compile	B-Language
class	B-Language
files	I-Language
and	O
whole	O
JARs	B-Language
that	O
contain	O
bytecode	O
into	O
machine	B-Language
code	I-Language
.	O
</s>
<s>
The	O
GCJ	O
runtime-libraries	O
original	O
source	O
is	O
from	O
GNU	B-Language
Classpath	I-Language
project	O
,	O
but	O
there	O
is	O
a	O
code	O
difference	O
between	O
the	O
libgcj	B-Language
libraries	O
.	O
</s>
<s>
GCJ	O
4.3	O
uses	O
the	O
Eclipse	B-Language
Compiler	I-Language
for	I-Language
Java	I-Language
as	O
a	O
front-end	O
.	O
</s>
<s>
In	O
2007	O
,	O
a	O
lot	O
of	O
work	O
was	O
done	O
to	O
implement	O
support	O
for	O
Java	B-Language
's	O
two	O
graphical	O
APIs	B-Application
in	O
GNU	B-Language
Classpath	I-Language
:	O
AWT	B-Language
and	O
Swing	B-Language
.	O
</s>
<s>
Software	O
support	O
for	O
AWT	B-Language
is	O
still	O
in	O
development	O
.	O
</s>
<s>
"	O
Once	O
AWT	B-Language
support	O
is	O
working	O
then	O
Swing	B-Language
support	O
can	O
be	O
considered	O
.	O
</s>
<s>
There	O
is	O
at	O
least	O
one	O
free-software	B-Application
partial	O
implementations	O
of	O
Swing	B-Language
that	O
may	O
be	O
usable.	O
"	O
.	O
</s>
<s>
The	O
GNU	B-Language
CLASSPATH	I-Language
was	O
never	O
completed	O
to	O
even	O
Java	B-Language
1.2	O
status	O
and	O
now	O
appears	O
to	O
have	O
been	O
abandoned	O
completely	O
.	O
</s>
<s>
As	O
of	O
2015	O
,	O
there	O
were	O
no	O
new	O
developments	O
announced	O
from	O
GCJ	O
and	O
the	O
product	O
was	O
in	O
maintenance	B-General_Concept
mode	I-General_Concept
,	O
with	O
open-source	O
Java	B-Language
toolchain	O
development	O
mostly	O
happening	O
within	O
OpenJDK	B-Language
.	O
</s>
<s>
GCJ	O
was	O
removed	O
from	O
the	O
GCC	B-Application
trunk	B-General_Concept
on	O
September	O
30	O
,	O
2016	O
.	O
</s>
<s>
Announcement	O
of	O
its	O
removal	O
was	O
made	O
with	O
the	O
release	O
of	O
the	O
GCC	B-Application
7.1	O
,	O
which	O
does	O
not	O
contain	O
it	O
.	O
</s>
<s>
GCJ	O
remains	O
part	O
of	O
GCC	B-Application
6	O
.	O
</s>
<s>
The	O
compilation	B-Language
function	O
in	O
GCJ	O
should	O
have	O
a	O
faster	O
start-up	O
time	O
than	O
the	O
equivalent	O
bytecode	O
launched	O
in	O
a	O
JVM	B-Language
when	O
compiling	B-Language
Java	B-Language
code	I-Language
into	O
machine	B-Language
code	I-Language
.	O
</s>
<s>
The	O
Compiled	B-Language
Native	O
Interface	O
(	O
CNI	O
)	O
,	O
previously	O
named	O
"	O
Cygnus	O
Native	O
Interface	O
"	O
,	O
is	O
a	O
software	B-Architecture
framework	I-Architecture
for	O
the	O
GCJ	O
that	O
allows	O
Java	B-Language
code	I-Language
to	O
call	B-Language
,	O
and	O
be	O
called	B-Language
by	O
,	O
native	B-Language
applications	I-Language
(	O
programs	O
specific	O
to	O
a	O
hardware	O
and	O
operating-system	O
platform	O
)	O
and	O
libraries	O
written	O
in	O
C++	B-Language
.	O
</s>
<s>
CNI	O
closely	O
resembles	O
the	O
JNI	B-Language
(	O
Java	B-Language
Native	I-Language
Interface	I-Language
)	O
framework	O
which	O
comes	O
as	O
a	O
standard	O
with	O
various	O
Java	B-Language
virtual	I-Language
machines	I-Language
.	O
</s>
<s>
The	O
authors	O
of	O
CNI	O
claim	O
for	O
various	O
advantages	O
over	O
JNI	B-Language
:	O
</s>
<s>
CNI	O
depends	O
on	O
Java	B-Language
classes	O
appearing	O
as	O
C++	B-Language
classes	O
.	O
</s>
<s>
given	O
a	O
Java	B-Language
class	I-Language
,	O
</s>
