<s>
Apache	B-Language
Commons	I-Language
Logging	I-Language
(	O
previously	O
known	O
as	O
Jakarta	B-Language
Commons	I-Language
Logging	I-Language
or	O
JCL	O
)	O
is	O
a	O
Java-based	O
logging	O
utility	O
and	O
a	O
programming	O
model	O
for	O
logging	O
and	O
for	O
other	O
toolkits	O
.	O
</s>
<s>
It	O
provides	O
APIs	B-Application
,	O
log	O
implementations	O
,	O
and	O
wrapper	O
implementations	O
over	O
some	O
other	O
tools	O
.	O
</s>
<s>
The	O
following	O
table	O
defines	O
the	O
log	O
levels	O
and	O
messages	O
in	O
Apache	B-Language
Commons	I-Language
Logging	I-Language
,	O
in	O
decreasing	O
order	O
of	O
severity	O
.	O
</s>
<s>
warn	O
Use	O
of	O
deprecated	O
APIs	B-Application
,	O
poor	O
use	O
of	O
API	B-Application
,	O
'	O
almost	O
 '	O
errors	O
,	O
other	O
runtime	O
situations	O
that	O
are	O
undesirable	O
or	O
unexpected	O
,	O
but	O
not	O
necessarily	O
"	O
wrong	O
"	O
.	O
</s>
<s>
Two	O
basic	O
abstractions	O
,	O
Log	O
and	O
LogFactory	O
,	O
are	O
used	O
in	O
Apache	B-Language
Commons	I-Language
Logging	I-Language
.	O
</s>
