<s>
An	O
"	O
Entity	B-Language
Bean	I-Language
"	O
is	O
a	O
type	O
of	O
Enterprise	B-Language
JavaBean	I-Language
,	O
a	O
server-side	O
Java	B-Language
EE	I-Language
component	O
,	O
that	O
represents	O
persistent	O
data	O
maintained	O
in	O
a	O
database	O
.	O
</s>
<s>
An	O
entity	B-Language
bean	I-Language
can	O
manage	O
its	O
own	O
persistence	O
(	O
Bean	O
managed	O
persistence	O
)	O
or	O
can	O
delegate	O
this	O
function	O
to	O
its	O
EJB	B-Language
Container	I-Language
(	O
Container	O
managed	O
persistence	O
)	O
.	O
</s>
<s>
An	O
entity	B-Language
bean	I-Language
is	O
identified	O
by	O
a	O
primary	O
key	O
.	O
</s>
<s>
If	O
the	O
container	O
in	O
which	O
an	O
entity	B-Language
bean	I-Language
is	O
hosted	O
crashes	O
,	O
the	O
entity	B-Language
bean	I-Language
,	O
its	O
primary	O
key	O
,	O
and	O
any	O
remote	O
references	O
survive	O
the	O
crash	O
.	O
</s>
<s>
In	O
EJB	B-Language
3.0	O
,	O
entity	B-Language
beans	I-Language
were	O
superseded	O
by	O
the	O
Java	B-Language
Persistence	I-Language
API	I-Language
(	O
which	O
was	O
subsequently	O
completely	O
separated	O
to	O
its	O
own	O
spec	O
as	O
of	O
EJB	B-Language
3.1	O
)	O
.	O
</s>
<s>
Entity	B-Language
Beans	I-Language
have	O
been	O
marked	O
as	O
a	O
candidate	O
for	O
pruning	O
as	O
of	O
Java	B-Language
EE	I-Language
6	I-Language
and	O
are	O
therefore	O
considered	O
a	O
deprecated	B-General_Concept
technology	I-General_Concept
.	O
</s>
<s>
Entity	B-Language
Beans	I-Language
before	O
EJB	B-Language
2.0	O
should	O
not	O
be	O
used	O
in	O
great	O
numbers	O
because	O
each	O
entity	B-Language
bean	I-Language
was	O
in	O
fact	O
a	O
RMI	B-Language
stub	I-Language
with	O
its	O
own	O
RMI	O
connection	O
to	O
the	O
EJB	B-Language
server	O
.	O
</s>
<s>
Obtaining	O
1000	O
entity	B-Language
beans	I-Language
as	O
a	O
single	O
operation	O
would	O
result	O
in	O
1000	O
simultaneous	O
internet	O
connections	O
to	O
the	O
RMI	O
back-end	O
.	O
</s>
<s>
Since	O
TCP/IP	B-Protocol
only	O
supports	O
65536	O
ports	O
you	O
are	O
essentially	O
limited	O
to	O
using	O
65536	O
entity	B-Language
beans	I-Language
at	O
a	O
time	O
.	O
</s>
<s>
For	O
example	O
,	O
if	O
a	O
client	O
application	O
wanted	O
to	O
monitor	O
the	O
state	O
of	O
1024	O
database	O
entries	O
it	O
would	O
take	O
1024	O
entity	B-Language
bean	I-Language
references	O
and	O
thus	O
1024	O
RMI	O
connections	O
to	O
the	O
EJB	B-Language
server	O
,	O
the	O
EJB	B-Language
server	O
would	O
in	O
turn	O
need	O
to	O
support	O
all	O
1024	O
connections	O
from	O
each	O
client	O
application	O
,	O
and	O
would	O
be	O
limited	O
to	O
serving	O
at	O
most	O
64	O
client	O
applications	O
at	O
which	O
point	O
all	O
further	O
internet	O
connections	O
would	O
be	O
ignored	O
.	O
</s>
<s>
These	O
limitations	O
are	O
impossible	O
to	O
overcome	O
when	O
using	O
entity	B-Language
beans	I-Language
over	O
RMI	O
.	O
</s>
