<s>
A	O
Jakarta	B-Language
EE	I-Language
application	I-Language
(	O
formerly	O
also	O
called	O
Java	B-Language
EE	I-Language
or	O
J2EE	B-Language
application	I-Language
)	O
is	O
any	O
deployable	O
unit	O
of	O
Jakarta	B-Language
EE	I-Language
functionality	O
.	O
</s>
<s>
This	O
can	O
be	O
a	O
single	O
Jakarta	B-Language
EE	I-Language
module	O
or	O
a	O
group	O
of	O
modules	O
packaged	O
into	O
an	O
EAR	B-Language
file	I-Language
along	O
with	O
a	O
Jakarta	B-Language
EE	I-Language
application	I-Language
deployment	B-Language
descriptor	I-Language
.	O
</s>
<s>
Jakarta	B-Language
EE	I-Language
applications	I-Language
are	O
typically	O
engineered	O
to	O
be	O
distributed	O
across	O
multiple	O
computing	O
tiers	O
.	O
</s>
<s>
Enterprise	B-Application
applications	I-Application
can	O
consist	O
of	O
combinations	O
of	O
the	O
following	O
:	O
</s>
<s>
Jakarta	B-Language
Enterprise	I-Language
Beans	I-Language
(	O
EJB	B-Language
)	O
modules	O
(	O
packaged	O
in	O
JAR	B-Language
files	I-Language
)	O
;	O
</s>
<s>
connector	O
modules	O
or	O
resource	B-Language
adapters	I-Language
(	O
packaged	O
in	O
RAR	O
files	O
)	O
;	O
</s>
<s>
Session	B-Application
Initiation	I-Application
Protocol	I-Application
(	O
SIP	O
)	O
modules	O
(	O
packaged	O
in	O
SAR	O
files	O
)	O
;	O
</s>
<s>
Additional	O
JAR	B-Language
files	I-Language
containing	O
dependent	O
classes	O
or	O
other	O
components	O
required	O
by	O
the	O
application	O
;	O
</s>
