<s>
Jakarta	O
Faces	O
,	O
formerly	O
Jakarta	O
Server	O
Faces	O
and	O
JavaServer	O
Faces	O
(	O
JSF	O
)	O
is	O
a	O
Java	B-Language
specification	O
for	O
building	O
component-based	O
user	B-Application
interfaces	I-Application
for	O
web	B-Application
applications	I-Application
and	O
was	O
formalized	O
as	O
a	O
standard	O
through	O
the	O
Java	B-Language
Community	I-Language
Process	I-Language
being	O
part	O
of	O
the	O
Java	B-Language
Platform	I-Language
,	I-Language
Enterprise	I-Language
Edition	I-Language
.	O
</s>
<s>
It	O
is	O
also	O
an	O
MVC	O
web	B-Application
framework	I-Application
that	O
simplifies	O
the	O
construction	O
of	O
user	B-Application
interfaces	I-Application
(	O
UI	B-Application
)	O
for	O
server-based	O
applications	O
by	O
using	O
reusable	O
UI	B-Application
components	O
in	O
a	O
page	O
.	O
</s>
<s>
JSF	O
2.x	O
uses	O
Facelets	B-Language
as	O
its	O
default	O
templating	O
system	O
.	O
</s>
<s>
Users	O
of	O
the	O
software	O
may	O
also	O
choose	O
to	O
employ	O
technologies	O
such	O
as	O
XUL	B-Application
,	O
or	O
Java	B-Language
.	O
</s>
<s>
JSF	O
1.x	O
uses	O
JavaServer	B-Language
Pages	I-Language
(	O
JSP	O
)	O
as	O
its	O
default	O
templating	O
system	O
.	O
</s>
<s>
In	O
June	O
2001	O
,	O
JavaWorld	O
would	O
report	O
on	O
Amy	O
Fowler	O
's	O
team	O
's	O
design	O
of	O
"	O
the	O
JavaServer	O
Faces	O
API	O
"	O
(	O
also	O
known	O
as	O
"	O
Moonwalk	O
"	O
)	O
as	O
"	O
an	O
application	O
framework	O
for	O
creating	O
Web-based	B-Application
user	B-Application
interfaces	I-Application
"	O
.	O
</s>
<s>
Facelets	B-Language
(	O
which	O
was	O
designed	O
specifically	O
for	O
Java	B-Language
Server	O
Faces	O
)	O
was	O
adopted	O
as	O
the	O
official	O
view	O
technology	O
for	O
JSF	O
2.0	O
.	O
</s>
<s>
This	O
eliminates	O
the	O
life-cycle	O
conflicts	O
that	O
existed	O
with	O
JSP	O
,	O
forcing	O
workarounds	O
by	O
Java	B-Language
developers	O
.	O
</s>
<s>
The	O
new	O
JSF	O
developments	O
also	O
provide	O
wide	O
accessibility	O
to	O
Java	B-Language
annotations	I-Language
such	O
as	O
@ManagedBean	O
,	O
@ManagedProperty	O
and	O
@FacesComponent	O
that	O
removes	O
the	O
need	O
for	O
faces-config.xml	O
,	O
in	O
all	O
cases	O
except	O
framework	O
extension	O
.	O
</s>
<s>
Page	O
transitions	O
can	O
be	O
invoked	O
simply	O
by	O
passing	O
the	O
name	O
of	O
the	O
desired	O
View	O
or	O
Facelet	B-Language
.	O
</s>
<s>
The	O
addition	O
of	O
Partial	O
State	O
Saving	O
and	O
Document	B-General_Concept
Object	I-General_Concept
Model	I-General_Concept
(	O
DOM	B-General_Concept
)	O
updates	O
are	O
part	O
of	O
the	O
built-in	O
standardized	O
AJAX	B-General_Concept
support	O
.	O
</s>
<s>
The	O
latest	O
JSF	O
release	O
has	O
built-in	O
support	O
for	O
handling	O
resources	O
like	O
images	O
,	O
CSS	B-Language
and	O
Javascript	B-Language
,	O
allowing	O
artifacts	O
to	O
be	O
included	O
with	O
component	O
libraries	O
,	O
separated	O
into	O
JAR	O
files	O
,	O
or	O
simply	O
co-located	O
into	O
a	O
consistent	O
place	O
within	O
the	O
Web	B-Application
application	I-Application
.	O
</s>
<s>
JSF	O
2.0	O
also	O
includes	O
a	O
number	O
of	O
other	O
changes	O
like	O
adding	O
support	O
for	O
events	O
,	O
separate	O
development	O
,	O
staging	O
,	O
and	O
production	O
modes	O
,	O
similar	O
to	O
RAILS_ENV	O
in	O
Ruby	B-Application
on	I-Application
Rails	I-Application
,	O
and	O
significantly	O
expanding	O
the	O
standard	O
set	O
of	O
components	O
.	O
</s>
<s>
JSF	O
3.0.0	O
(	O
2020-10-28	O
)	O
Package	O
name	O
changed	O
from	O
Javax	B-Language
to	O
Jakarta	O
.	O
</s>
<s>
JSF	O
2.3	O
(	O
2019-09-10	O
)	O
The	O
first	O
release	O
of	O
the	O
Jakarta	B-Language
Server	I-Language
Pages	I-Language
API	O
for	O
Jakarta	O
EE.Neither	O
the	O
API	O
nor	O
the	O
behavior	O
has	O
changed	O
.	O
</s>
<s>
JSF	O
2.3	O
(	O
2017-03-28	O
)	O
–	O
Major	O
features	O
:	O
search	O
Expressions	O
,	O
extensionless	O
URLs	O
,	O
bean	O
validation	O
for	O
complete	O
classes	O
,	O
push	O
communication	O
using	O
WebSocket	B-Protocol
,	O
enhanced	O
integration	O
with	O
CDI	O
.	O
</s>
<s>
Coincides	O
with	O
Java	B-Language
EE	I-Language
6	I-Language
.	O
</s>
<s>
Coincides	O
with	O
Java	B-Language
EE	I-Language
5	I-Language
.	O
</s>
<s>
Initial	O
adoption	O
into	O
Java	B-Language
EE	I-Language
.	O
</s>
<s>
Based	O
on	O
a	O
component-driven	O
UI	B-Application
design-model	O
,	O
JavaServer	O
Faces	O
uses	O
XML	O
files	O
called	O
view	O
templates	O
or	O
Facelets	B-Language
views	O
.	O
</s>
<s>
The	O
FacesServlet	O
processes	O
requests	O
,	O
loads	O
the	O
appropriate	O
view	O
template	O
,	O
builds	O
a	O
component	O
tree	O
,	O
processes	O
events	O
,	O
and	O
renders	O
the	O
response	O
(	O
typically	O
in	O
the	O
HTML	B-Language
language	I-Language
)	O
to	O
the	O
client	O
.	O
</s>
<s>
The	O
state	O
of	O
UI	B-Application
components	O
and	O
other	O
objects	O
of	O
scope	O
interest	O
is	O
saved	O
at	O
the	O
end	O
of	O
each	O
request	O
in	O
a	O
process	O
called	O
stateSaving	O
(	O
note	O
:	O
transient	O
true	O
)	O
,	O
and	O
restored	O
upon	O
next	O
creation	O
of	O
that	O
view	O
.	O
</s>
<s>
JSF	O
is	O
often	O
used	O
together	O
with	O
AJAX	B-General_Concept
,	O
a	O
Rich	B-Application
Internet	I-Application
application	I-Application
development	O
technique	O
.	O
</s>
<s>
AJAX	B-General_Concept
is	O
a	O
combination	O
of	O
web	O
development	O
techniques	O
and	O
technologies	O
that	O
make	O
it	O
possible	O
to	O
create	O
rich	B-Application
user	B-Application
interfaces	I-Application
.	O
</s>
<s>
The	O
user	B-Application
interface	I-Application
components	O
in	O
Mojarra	O
(	O
the	O
JSF	O
reference	O
implementation	O
)	O
and	O
Apache	B-Language
MyFaces	I-Language
were	O
originally	O
developed	O
for	O
HTML	B-Language
only	O
,	O
and	O
AJAX	B-General_Concept
had	O
to	O
be	O
added	O
via	O
JavaScript	B-Language
.	O
</s>
<s>
Because	O
JSF	O
supports	O
multiple	O
output	O
formats	O
,	O
AJAX-enabled	O
components	O
can	O
easily	O
be	O
added	O
to	O
improve	O
user	B-Application
interfaces	I-Application
created	O
with	O
JSF	O
.	O
</s>
<s>
The	O
JSF	O
2.0	O
specification	O
provides	O
built-in	O
support	O
for	O
AJAX	B-General_Concept
by	O
standardizing	O
the	O
AJAX	B-General_Concept
request	O
lifecycle	O
and	O
providing	O
simple	O
development	O
interfaces	O
to	O
AJAX	B-General_Concept
events	O
.	O
</s>
<s>
The	O
specification	O
allows	O
an	O
event	O
triggered	O
by	O
the	O
client	O
to	O
go	O
through	O
validation	O
,	O
conversion	O
,	O
and	O
method	O
invocation	O
,	O
before	O
returning	O
the	O
result	O
to	O
the	O
browser	O
via	O
an	O
XML	B-General_Concept
DOM	I-General_Concept
update	O
.	O
</s>
<s>
JSF	O
2	O
includes	O
support	O
for	O
graceful	B-General_Concept
degradation	I-General_Concept
when	O
JavaScript	B-Language
is	O
disabled	O
in	O
the	O
browser	O
.	O
</s>
<s>
The	O
following	O
companies	O
and	O
projects	O
offer	O
AJAX-based	O
JSF	O
frameworks	O
or	O
component	O
libraries	O
:	O
</s>
<s>
JBoss	B-Language
RichFaces	I-Language
(	O
derived	O
from	O
and	O
replaces	O
AJAX4jsf	B-Language
)	O
–	O
AJAX-enabled	O
JSF	O
components	O
for	O
layout	O
,	O
file	O
upload	O
,	O
forms	O
,	O
inputs	O
and	O
many	O
other	O
features	O
.	O
</s>
<s>
In	O
their	O
January	O
2014	O
Technology	O
Radar	O
publication	O
,	O
ThoughtWorks	B-Application
wrote	O
:	O
</s>
<s>
In	O
February	O
2014	O
,	O
Çağatay	O
Çivici	O
(	O
PrimeFaces	B-Language
Lead	O
)	O
responded	O
to	O
ThoughtWorks	B-Application
criticisms	O
in	O
a	O
post	O
titled	O
JSF	O
is	O
not	O
what	O
you	O
've	O
been	O
told	O
anymore	O
.	O
</s>
<s>
Çivici	O
argues	O
that	O
improvements	O
in	O
JSF	O
over	O
the	O
years	O
offer	O
many	O
features	O
that	O
embrace	O
modern	O
web	O
development	O
,	O
providing	O
the	O
option	O
to	O
write	O
your	O
own	O
JavaScript	B-Language
,	O
HTML	B-Language
,	O
and	O
CSS	B-Language
.	O
</s>
<s>
In	O
February	O
2016	O
,	O
the	O
enterprise	B-Language
Java	I-Language
community	O
website	O
TheServerSide	O
published	O
an	O
article	O
recommending	O
against	O
the	O
use	O
of	O
JSF	O
,	O
whose	O
use	O
could	O
compromise	O
the	O
quality	O
of	O
the	O
final	O
product	O
.	O
</s>
<s>
Primitive	O
AJAX	B-General_Concept
support	O
.	O
</s>
