<s>
Spring	B-Language
Security	I-Language
is	O
a	O
Java/Java	O
EE	O
framework	O
that	O
provides	O
authentication	O
,	O
authorization	O
and	O
other	O
security	O
features	O
for	O
enterprise	O
applications	O
.	O
</s>
<s>
The	O
project	O
was	O
started	O
in	O
late	O
2003	O
as	O
'	O
Acegi	O
Security	O
 '	O
(	O
pronounced	O
Ah-see-gee	O
,	O
whose	O
letters	O
are	O
the	O
first	O
,	O
third	O
,	O
fifth	O
,	O
seventh	O
,	O
and	O
ninth	O
characters	O
from	O
the	O
English	O
alphabet	O
,	O
in	O
order	O
to	O
prevent	O
name	O
conflicts	O
)	O
by	O
Ben	O
Alex	O
,	O
with	O
it	O
being	O
publicly	O
released	O
under	O
the	O
Apache	B-Application
License	I-Application
in	O
March	O
2004	O
.	O
</s>
<s>
Subsequently	O
,	O
Acegi	O
was	O
incorporated	O
into	O
the	O
Spring	B-Application
portfolio	O
as	O
Spring	B-Language
Security	I-Language
,	O
an	O
official	O
Spring	B-Application
sub-project	O
.	O
</s>
<s>
The	O
first	O
public	O
release	O
under	O
the	O
new	O
name	O
was	O
Spring	B-Language
Security	I-Language
2.0.0	O
in	O
April	O
2008	O
,	O
with	O
commercial	O
support	O
and	O
training	O
available	O
from	O
SpringSource	B-Application
.	O
</s>
<s>
Diagram	O
1	O
shows	O
the	O
basic	O
flow	O
of	O
an	O
authentication	O
request	O
using	O
the	O
Spring	B-Language
Security	I-Language
system	O
.	O
</s>
<s>
It	O
shows	O
the	O
different	O
filters	O
and	O
how	O
they	O
interact	O
from	O
the	O
initial	O
browser	O
request	O
,	O
to	O
either	O
a	O
successful	O
authentication	O
or	O
an	O
HTTP	B-Protocol
403	O
error	O
.	O
</s>
<s>
AbstractSecurityInterceptor	O
authorizes	O
the	O
regenerated	O
request	O
and	O
throws	O
Java	B-Language
exceptions	O
.	O
</s>
<s>
LDAP	B-Protocol
(	O
using	O
both	O
bind-based	O
and	O
password	O
comparison	O
strategies	O
)	O
for	O
centralization	O
of	O
authentication	O
information	O
.	O
</s>
<s>
Single	O
sign-on	O
capabilities	O
using	O
the	O
popular	O
Central	B-Language
Authentication	I-Language
Service	I-Language
.	O
</s>
<s>
Java	B-Language
Authentication	I-Language
and	I-Language
Authorization	I-Language
Service	I-Language
(	O
JAAS	O
)	O
LoginModule	O
,	O
a	O
standards-based	O
method	O
for	O
authentication	O
used	O
within	O
Java	B-Language
.	O
</s>
<s>
Basic	B-Protocol
access	I-Protocol
authentication	I-Protocol
as	O
defined	O
through	O
RFC	O
1945	O
.	O
</s>
<s>
Digest	B-Protocol
access	I-Protocol
authentication	I-Protocol
as	O
defined	O
through	O
RFC	O
2617	O
and	O
RFC	O
2069	O
.	O
</s>
<s>
X.509	O
client	O
certificate	O
presentation	O
over	O
the	O
Secure	B-Protocol
Sockets	I-Protocol
Layer	I-Protocol
standard	O
.	O
</s>
<s>
Su	B-Device
(	O
Unix	O
)	O
-like	O
support	O
for	O
switching	O
principal	O
identity	O
over	O
a	O
HTTP	B-Protocol
or	O
HTTPS	B-Protocol
connection	O
.	O
</s>
<s>
Container	O
adapter	O
(	O
custom	O
realm	O
)	O
support	O
for	O
Apache	B-Language
Tomcat	I-Language
,	O
Resin	B-Language
,	O
JBoss	B-Language
and	O
Jetty	B-Language
(	O
web	O
server	O
)	O
.	O
</s>
<s>
Web	O
form	O
authentication	O
,	O
similar	O
to	O
the	O
servlet	B-Language
container	I-Language
specification	O
.	O
</s>
<s>
"	O
Remember-me	O
"	O
support	O
via	O
HTTP	B-Application
cookies	I-Application
.	O
</s>
<s>
AspectJ	B-Application
method	O
invocation	O
authorization	O
.	O
</s>
<s>
HTTP	B-Protocol
authorization	O
of	O
web	O
request	O
URLs	O
using	O
a	O
choice	O
of	O
Apache	B-Application
Ant	I-Application
paths	O
or	O
regular	B-Language
expressions	I-Language
.	O
</s>
<s>
Spring	B-Language
Security	I-Language
offers	O
a	O
repository	O
for	O
storing	O
,	O
retrieving	O
,	O
and	O
modifying	O
ACLs	O
in	O
a	O
database	O
.	O
</s>
<s>
Software	B-General_Concept
localization	I-General_Concept
so	O
user	B-Application
interface	I-Application
messages	O
can	O
be	O
in	O
any	O
language	O
.	O
</s>
<s>
Channel	O
security	O
,	O
to	O
automatically	O
switch	O
between	O
HTTP	B-Protocol
and	O
HTTPS	B-Protocol
upon	O
meeting	O
particular	O
rules	O
.	O
</s>
<s>
Caching	B-General_Concept
in	O
all	O
database-touching	O
areas	O
of	O
the	O
framework	O
.	O
</s>
<s>
Publishing	O
of	O
messages	O
to	O
facilitate	O
event-driven	B-Application
programming	I-Application
.	O
</s>
<s>
Support	O
for	O
performing	O
integration	O
testing	O
via	O
JUnit	B-Language
.	O
</s>
<s>
Spring	B-Language
Security	I-Language
itself	O
has	O
comprehensive	O
JUnit	B-Language
isolation	O
tests	O
.	O
</s>
<s>
Several	O
sample	O
applications	O
,	O
detailed	O
JavaDocs	B-Language
and	O
a	O
reference	O
guide	O
.	O
</s>
<s>
Web	B-Application
framework	I-Application
independence	O
.	O
</s>
