<s>
Apache	B-Language
Struts	I-Language
2	I-Language
is	O
an	O
open-source	B-Application
web	B-Application
application	I-Application
framework	I-Application
for	O
developing	O
Java	B-Language
EE	I-Language
web	B-Application
applications	I-Application
.	O
</s>
<s>
It	O
uses	O
and	O
extends	O
the	B-Application
Java	I-Application
Servlet	I-Application
API	I-Application
to	O
encourage	O
developers	O
to	O
adopt	O
a	O
model	O
–	O
view	O
–	O
controller	O
(	O
MVC	O
)	O
architecture	O
.	O
</s>
<s>
The	O
WebWork	O
framework	O
spun	O
off	O
from	O
Apache	B-Language
Struts	I-Language
1	I-Language
aiming	O
to	O
offer	O
enhancements	O
and	O
refinements	O
while	O
retaining	O
the	O
same	O
general	O
architecture	O
of	O
the	O
original	O
Struts	B-Language
framework	I-Language
.	O
</s>
<s>
In	O
December	O
2005	O
,	O
it	O
was	O
announced	O
that	O
WebWork	O
2.2	O
was	O
adopted	O
as	O
Apache	B-Language
Struts	I-Language
2	I-Language
,	O
which	O
reached	O
its	O
first	O
full	O
release	O
in	O
February	O
2007	O
.	O
</s>
<s>
Struts	O
2	O
has	O
a	O
history	O
of	O
critical	O
security	O
bugs	O
,	O
many	O
tied	O
to	O
its	O
use	O
of	O
OGNL	B-Language
technology	O
;	O
some	O
vulnerabilities	O
can	O
lead	O
to	O
arbitrary	O
code	O
execution	O
.	O
</s>
