<s>
SAP	B-Language
NetWeaver	I-Language
Application	I-Language
Server	I-Language
or	O
SAP	B-Language
Web	I-Language
Application	I-Language
Server	I-Language
is	O
a	O
component	O
of	O
SAP	B-Application
NetWeaver	I-Application
which	O
works	O
as	O
a	O
web	O
application	O
server	O
for	O
SAP	B-Application
products	O
.	O
</s>
<s>
All	O
ABAP	B-Language
application	O
servers	O
including	O
the	O
message	O
server	O
represent	O
the	O
application	O
layer	O
of	O
the	O
multitier	B-Operating_System
architecture	I-Operating_System
of	O
an	O
ABAP-based	O
SAP	B-Application
system	O
.	O
</s>
<s>
These	O
application	O
servers	O
execute	O
ABAP	B-Language
applications	O
and	O
communicate	O
with	O
the	O
presentation	O
components	O
,	O
the	O
database	O
,	O
and	O
also	O
with	O
each	O
other	O
,	O
using	O
the	O
message	O
server	O
.	O
</s>
<s>
The	O
architecture	O
of	O
SAP	B-Language
Web	I-Language
Application	I-Language
Server	I-Language
can	O
be	O
separated	O
into	O
5	O
areas	O
:	O
</s>
<s>
Presentation	O
layer	O
In	O
the	O
presentation	O
layer	O
,	O
the	O
user	O
interface	O
can	O
be	O
developed	O
with	O
JavaServer	B-Language
Pages	I-Language
(	O
JSP	O
)	O
,	O
Business	O
Server	O
Pages	O
(	O
BSP	O
)	O
,	O
or	O
with	O
Web	B-Language
Dynpro	I-Language
technology	O
.	O
</s>
<s>
The	O
underlying	O
business	O
layer	O
provides	O
the	O
business	O
content	O
in	O
Java	O
or	O
ABAP	B-Language
.	O
</s>
<s>
Business	O
layer	O
The	O
business	O
layer	O
consists	O
of	O
a	O
J2EE	B-Language
certified	O
run-time	O
environment	O
that	O
processes	O
the	O
requests	O
passed	O
from	O
the	O
Internet	O
Communication	O
Manager	O
(	O
ICM	O
)	O
and	O
dynamically	O
generates	O
the	O
responses	O
.	O
</s>
<s>
The	O
business	O
logic	O
can	O
be	O
written	O
either	O
in	O
ABAP	B-Language
or	O
in	O
Java	O
based	O
on	O
the	O
J2EE	B-Language
standard	O
.	O
</s>
<s>
Developers	O
can	O
implement	O
business	O
logic	O
and	O
persistence	O
with	O
Enterprise	B-Language
JavaBeans	I-Language
(	O
EJB	B-Language
)	O
using	O
the	O
J2EE	B-Language
environment	O
.	O
</s>
<s>
Developers	O
can	O
also	O
access	O
the	O
business	O
objects	O
of	O
applications	O
running	O
in	O
the	O
ABAP	B-Language
environment	O
to	O
benefit	O
from	O
their	O
business	O
logic	O
and	O
persistence	O
.	O
</s>
<s>
Integration	O
layer	O
The	O
local	O
integration	O
engine	O
is	O
an	O
integral	O
part	O
of	O
SAP	B-Language
Web	I-Language
AS	I-Language
and	O
allows	O
instant	O
connection	O
to	O
SAP	B-Application
NetWeaver	I-Application
Process	I-Application
Integration	I-Application
(	O
SAP	B-Application
PI	I-Application
;	O
formerly	O
called	O
SAP	B-Application
Exchange	I-Application
Infrastructure	I-Application
)	O
.	O
</s>
<s>
The	O
local	O
integration	O
engine	O
provides	O
messaging	O
services	O
that	O
exchange	O
messages	O
between	O
the	O
components	O
that	O
are	O
connected	O
in	O
SAP	B-Application
PI	I-Application
.	O
</s>
<s>
Currently	O
,	O
modules	O
are	O
available	O
for	O
Hypertext	B-Protocol
Transfer	I-Protocol
Protocol	I-Protocol
(	O
HTTP	B-Protocol
)	O
,	O
HTTPS	B-Protocol
(	O
extension	O
of	O
HTTP	B-Protocol
running	O
under	O
the	O
Secure	B-Protocol
Sockets	I-Protocol
Layer	I-Protocol
(	O
SSL	O
)	O
)	O
,	O
Simple	B-Protocol
Mail	I-Protocol
Transfer	I-Protocol
Protocol	I-Protocol
(	O
SMTP	B-Protocol
)	O
,	O
Simple	B-Protocol
Object	I-Protocol
Access	I-Protocol
Protocol	I-Protocol
(	O
SOAP	B-Protocol
)	O
,	O
and	O
Fast	O
Common	O
Gateway	O
Interface	O
(	O
FastCGI	O
)	O
.	O
</s>
<s>
Persistence	O
layer	O
The	O
persistence	O
layer	O
supports	O
database	O
independence	O
and	O
scalable	O
transaction	B-General_Concept
handling	O
.	O
</s>
<s>
The	O
database	O
interface	O
ensures	O
optimized	O
data	O
access	O
from	O
within	O
the	O
ABAP	B-Language
environment	O
through	O
Open	O
SQL	O
.	O
</s>
<s>
SAP	B-Application
propagates	O
the	O
outstanding	O
capabilities	O
of	O
Open	O
SQL	O
for	O
ABAP	B-Language
to	O
Open	O
SQL	O
for	O
Java	O
and	O
offers	O
a	O
variety	O
of	O
standard	O
Application	B-Application
Programming	I-Application
Interfaces	I-Application
(	O
APIs	B-Application
)	O
to	O
application	O
programmers	O
,	O
such	O
as	O
SQLJ	B-Language
.	O
</s>
<s>
Other	O
technologies	O
,	O
such	O
as	O
Java	B-Language
Data	I-Language
Objects	I-Language
(	O
JDO	O
)	O
and	O
Container-Managed	O
Persistence	O
(	O
CMP	O
)	O
for	O
EJB	B-Language
,	O
or	O
the	O
direct	O
use	O
of	O
the	O
Java	B-Language
Database	I-Language
Connectivity	I-Language
(	O
JDBC	B-Language
)	O
API	B-Application
,	O
are	O
also	O
supported	O
.	O
</s>
<s>
The	O
SAP	B-Application
NetWeaver	I-Application
AS	O
can	O
accept	O
multiple	O
forms	O
of	O
authentication	O
:	O
</s>
<s>
SAP	B-Application
Logon	O
Ticket	O
with	O
appropriate	O
configuration	O
.	O
</s>
<s>
Other	O
single	O
sign-on	O
technology	O
that	O
utilizes	O
x.509	O
certificates	O
and	O
the	O
combination	O
of	O
Secure	B-Application
Network	I-Application
Communications	I-Application
(	O
SNC	O
)	O
and	O
Secure	B-Protocol
Sockets	I-Protocol
Layer	I-Protocol
(	O
SSL	O
)	O
for	O
one	O
standardize	O
authentication	O
platform	O
.	O
</s>
<s>
The	O
SAP	B-Language
NetWeaver	I-Language
Application	I-Language
Server	I-Language
's	O
connectivity	O
layer	O
supports	O
HTTPS	B-Protocol
which	O
is	O
required	O
for	O
encrypted	O
communications	O
via	O
Secure	B-Protocol
Sockets	I-Protocol
Layer	I-Protocol
.	O
</s>
<s>
It	O
is	O
possible	O
to	O
enable	O
SSL	O
using	O
the	O
SAP	B-Application
Cryptographic	O
Library	O
.	O
</s>
