<s>
OptaPlanner	B-Application
is	O
an	O
Open	B-Application
Source	I-Application
Constraint	O
Solver	O
.	O
</s>
<s>
It	O
solves	O
constraint	B-Application
satisfaction	I-Application
problems	I-Application
with	O
construction	O
heuristics	O
and	O
metaheuristic	B-Algorithm
algorithms	O
,	O
using	O
multithreaded	O
incremental	O
solving	O
.	O
</s>
<s>
OptaPlanner	B-Application
is	O
written	O
in	O
Java	B-Language
and	O
works	O
in	O
Kotlin	O
and	O
Scala	O
too	O
.	O
</s>
<s>
OptaPlanner	B-Application
development	O
is	O
sponsored	O
by	O
Red	O
Hat	O
,	O
which	O
sells	O
an	O
enterprise	O
support	O
subscription	O
for	O
it	O
.	O
</s>
<s>
In	O
2007	O
,	O
it	O
joined	O
the	O
Drools	B-Language
project	O
as	O
Drools	B-Language
Solver	O
.	O
</s>
<s>
The	O
first	O
release	O
was	O
drools-solver	O
5.0.0.M1	O
on	O
3	O
July	O
2008	O
.	O
</s>
<s>
In	O
2009	O
it	O
renamed	O
to	O
Drools	B-Language
Planner	O
.	O
</s>
<s>
In	O
March	O
2013	O
,	O
it	O
from	O
Drools	B-Language
project	O
and	O
finally	O
renamed	O
to	O
OptaPlanner	B-Application
.	O
</s>
<s>
Red	O
Hat	O
's	O
support	O
product	O
for	O
OptaPlanner	B-Application
is	O
called	O
Red	O
Hat	O
Business	O
Optimizer	O
(	O
before	O
2018	O
it	O
was	O
called	O
Red	O
Hat	O
JBoss	O
Business	O
Resource	O
Planner	O
)	O
.	O
</s>
<s>
OptaPlanner	B-Application
contributors	O
regularly	O
compete	O
against	O
academic	O
researchers	O
in	O
research	O
competitions	O
.	O
</s>
