<s>
Spring	B-Language
Roo	I-Language
is	O
an	O
open-source	B-Application
software	I-Application
tool	O
that	O
uses	O
convention-over-configuration	B-Application
principles	O
to	O
provide	O
rapid	O
application	O
development	O
of	O
Java-based	O
enterprise	B-Application
software	I-Application
.	O
</s>
<s>
The	O
resulting	O
applications	O
use	O
common	O
Java	B-Language
technologies	I-Language
such	O
as	O
Spring	B-Application
Framework	I-Application
,	O
Java	B-Language
Persistence	I-Language
API	I-Language
,	O
Thymeleaf	B-Language
,	O
Apache	B-Language
Maven	I-Language
and	O
AspectJ	B-Application
.	O
</s>
<s>
Spring	B-Language
Roo	I-Language
is	O
a	O
member	O
of	O
the	O
Spring	B-Application
portfolio	O
of	O
projects	O
.	O
</s>
<s>
Spring	B-Language
Roo	I-Language
's	O
mission	O
statement	O
is	O
to	O
"	O
fundamentally	O
improve	O
Java	B-Language
developer	O
productivity	O
without	O
compromising	O
engineering	O
integrity	O
or	O
flexibility	O
"	O
.	O
</s>
<s>
During	O
the	O
keynote	O
an	O
application	O
was	O
built	O
live	O
on-stage	O
that	O
would	O
be	O
used	O
by	O
conference	O
attendees	O
to	O
vote	O
on	O
the	O
preferred	O
name	O
for	O
the	O
project	O
(	O
which	O
at	O
that	O
time	O
was	O
codenamed	O
"	O
Roo	O
"	O
within	O
SpringSource	B-Application
)	O
.	O
</s>
<s>
Ultimately	O
the	O
name	O
"	O
Spring	B-Language
Roo	I-Language
"	O
was	O
preferred	O
over	O
alternatives	O
including	O
Spring	B-Application
Boost	O
,	O
Spring	B-Application
Spark	O
,	O
Spring	B-Application
HyperDrive	O
and	O
Spring	B-Application
Dart	O
.	O
</s>
<s>
In	O
October	O
2010	O
,	O
Spring	B-Language
Roo	I-Language
1.1.0.RELEASE	O
was	O
released	O
.	O
</s>
<s>
The	O
1.1.0	O
release	O
moved	O
to	O
an	O
OSGi	B-Application
foundation	O
with	O
associated	O
add-on	O
discovery	O
model	O
,	O
plus	O
added	O
support	O
for	O
incremental	O
database	O
reverse	O
engineering	O
,	O
Spring	B-Application
MVC	I-Application
page	O
complexity	O
reduction	O
,	O
Google	O
Web	O
Toolkit	O
,	O
Google	B-Application
App	I-Application
Engine	I-Application
,	O
Apache	O
Solr	O
,	O
JSON	B-General_Concept
and	O
smaller	O
features	O
like	O
serializable	O
automation	O
.	O
</s>
<s>
The	O
current	O
Roo	O
project	O
engineers	O
are	O
employed	O
by	O
SpringSource	B-Application
and	O
as	O
such	O
Roo	O
releases	O
typically	O
support	O
the	O
latest	O
available	O
releases	O
of	O
other	O
Spring	B-Application
portfolio	O
projects	O
.	O
</s>
<s>
In	O
2014	O
takes	O
over	O
the	O
leadership	O
of	O
the	O
open	O
source	O
framework	O
Spring	B-Language
Roo	I-Language
after	O
the	O
partnership	O
agreement	O
with	O
Pivotal	O
.	O
</s>
<s>
They	O
collaborate	O
on	O
further	O
development	O
of	O
the	O
Spring	B-Language
Roo	I-Language
project	O
.	O
</s>
<s>
The	O
Spring	B-Language
Roo	I-Language
project	O
will	O
remain	O
as	O
an	O
open	O
source	O
project	O
under	O
Spring	B-Application
,	O
maintaining	O
the	O
same	O
current	O
licensing	O
policy	O
.	O
</s>
<s>
Both	O
Pivotal	O
and	O
DISID	O
are	O
calling	O
on	O
the	O
Spring	B-Application
and	O
Java	B-Language
communities	O
for	O
anyone	O
who	O
would	O
like	O
to	O
collaborate	O
in	O
the	O
project	O
.	O
</s>
<s>
Java	B-Language
(	O
version	O
5	O
,	O
6	O
or	O
7	O
)	O
.	O
</s>
<s>
Java	B-Language
7	O
is	O
supported	O
since	O
Roo	O
1.2.4	O
.	O
</s>
<s>
The	O
above	O
list	O
can	O
be	O
augmented	O
through	O
additional	O
Roo	O
add-ons	O
,	O
which	O
provide	O
Roo	O
's	O
method	O
of	O
extensibility	B-Architecture
.	O
</s>
<s>
Spring	B-Language
Roo	I-Language
's	O
main	O
user	O
interface	O
is	O
a	O
command-line	B-Application
shell	B-Operating_System
.	O
</s>
<s>
The	O
shell	B-Operating_System
provides	O
both	O
a	O
command-line	B-Application
interface	I-Application
and	O
also	O
a	O
mechanism	O
to	O
host	O
plug-ins	B-Application
(	O
which	O
are	O
called	O
"	O
add-ons	O
"	O
in	O
Roo	O
)	O
.	O
</s>
<s>
One	O
key	O
design	O
goal	O
of	O
Roo	O
is	O
to	O
ensure	O
a	O
user	O
can	O
continue	O
to	O
work	O
in	O
a	O
"	O
natural	O
way	O
"	O
,	O
which	O
typically	O
means	O
using	O
their	O
preferred	O
integrated	B-Application
development	I-Application
environment	I-Application
(	O
IDE	O
)	O
or	O
text	B-Application
editor	I-Application
for	O
most	O
tasks	O
.	O
</s>
<s>
As	O
such	O
Roo	O
is	O
often	O
loaded	O
in	O
a	O
separate	O
window	O
to	O
the	O
IDE	O
or	O
text	B-Application
editor	I-Application
,	O
and	O
will	O
monitor	O
the	O
file	B-Application
system	I-Application
for	O
changes	O
made	O
by	O
the	O
user	O
outside	O
of	O
Roo	O
.	O
</s>
<s>
The	O
user	O
interface	O
shell	B-Operating_System
supports	O
extensive	O
usability	B-General_Concept
features	O
including	O
command-line	B-Application
completion	O
(	O
i.e.	O
</s>
<s>
press	O
TAB	O
)	O
,	O
online	B-Protocol
help	I-Protocol
,	O
hinting	O
(	O
a	O
form	O
of	O
context-sensitive	B-Protocol
help	I-Protocol
)	O
and	O
contextual	O
awareness	O
(	O
which	O
provides	O
automatic	O
inference	O
of	O
likely	O
intentions	O
based	O
on	O
recent	O
activity	O
)	O
.	O
</s>
<s>
This	O
allows	O
a	O
user	O
to	O
create	O
a	O
new	O
software	O
project	O
via	O
the	O
Roo	O
shell	B-Operating_System
,	O
or	O
use	O
Roo	O
on	O
an	O
existing	O
project	O
.	O
</s>
<s>
The	O
following	O
is	O
an	O
example	O
of	O
the	O
commands	O
used	O
by	O
Roo	O
to	O
create	O
a	O
new	O
application	O
plus	O
the	O
Spring	B-Application
Boot	O
Maven	B-Language
plugin	B-Application
run	O
goal	O
to	O
compile	O
and	O
run	O
the	O
application	O
using	O
an	O
embedded	O
HTTP	O
server	O
:	O
</s>
<s>
While	O
there	O
are	O
many	O
ways	O
that	O
software	O
can	O
automatically	B-Application
generate	I-Application
code	O
,	O
Roo	O
operates	O
by	O
generating	O
AspectJ	B-Application
inter-type	B-Language
declarations	I-Language
(	O
otherwise	O
known	O
as	O
mixins	B-Language
or	O
introductions	O
)	O
.	O
</s>
<s>
This	O
means	O
Roo	O
can	O
incrementally	O
modify	O
the	O
AspectJ	B-Application
inter-type	B-Language
declarations	I-Language
that	O
it	O
needs	O
to	O
and	O
leave	O
all	O
other	O
files	O
intact	O
.	O
</s>
<s>
Spring	B-Language
Roo	I-Language
uses	O
add-ons	O
to	O
provide	O
all	O
the	O
functionality	O
within	O
and	O
on	O
top	O
of	O
an	O
OSGi	B-Application
runtime	B-Library
system	O
based	O
on	O
Apache	B-Language
Felix	I-Language
.	O
</s>
<s>
Spring	B-Language
Roo	I-Language
differentiates	O
from	O
other	O
convention-over-configuration	B-Application
rapid	O
application	O
development	O
tools	O
in	O
the	O
following	O
major	O
ways	O
:	O
</s>
<s>
Java	B-Language
platform	O
productivity	O
:	O
Roo	O
provides	O
a	O
productivity	O
solution	O
for	O
Java	B-Language
developers	O
.	O
</s>
<s>
It	O
does	O
not	O
require	O
the	O
user	O
to	O
program	O
in	O
any	O
language	O
other	O
than	O
Java	B-Language
.	O
</s>
<s>
It	O
also	O
uses	O
mainstream	O
Java	B-Language
enterprise	B-Application
application	I-Application
standards	O
and	O
technologies	O
(	O
as	O
listed	O
above	O
)	O
to	O
maximize	O
reuse	O
of	O
existing	O
developer	O
knowledge	O
,	O
skills	O
and	O
experience	O
.	O
</s>
<s>
Usability	B-General_Concept
:	O
Roo	O
's	O
shell	B-Operating_System
is	O
designed	O
to	O
provide	O
a	O
discoverable	O
,	O
easy-to-use	O
environment	O
that	O
minimizes	O
training	O
requirements	O
.	O
</s>
<s>
Roo	O
annotations	O
all	O
start	O
with	O
@Roo	O
to	O
facilitate	O
code	O
assist	O
(	O
command	B-Application
line	I-Application
completion	O
in	O
IDEs	O
)	O
.	O
</s>
<s>
No	O
runtime	B-Library
:	O
Roo	O
does	O
not	O
provide	O
a	O
runtime	B-Library
API	O
or	O
require	O
specific	O
runtime	B-Library
components	O
.	O
</s>
<s>
This	O
ensures	O
there	O
is	O
no	O
Roo-related	O
CPU	B-Device
,	O
memory	B-General_Concept
and	O
disk	B-Device
storage	I-Device
resource	O
consumption	O
at	B-Library
runtime	I-Library
.	O
</s>
<s>
Roo	O
code	O
is	O
optimized	O
for	O
small-footprint	O
cloud	B-Architecture
deployment	O
and	O
high	O
scalability	B-Architecture
use	O
cases	O
.	O
</s>
<s>
This	O
is	O
possible	O
because	O
there	O
is	O
no	O
runtime	B-Library
component	O
to	O
remove	O
,	O
@Roo	O
annotations	O
are	O
"	O
source	O
retention	O
"	O
only	O
(	O
ensuring	O
they	O
are	O
not	O
preserved	O
in	O
compiled	O
*	O
.class	O
files	O
)	O
and	O
Roo	O
's	O
AspectJ	B-Application
inter-type	B-Language
declarations	I-Language
can	O
be	O
"	O
pushed	O
in	O
"	O
to	O
standard	O
*	O
.java	O
compilation	O
units	O
.	O
</s>
<s>
Extensibility	B-Architecture
:	O
Roo	O
's	O
separation	O
of	O
core	O
infrastructure	O
and	O
base	O
add-ons	O
intends	O
to	O
allow	O
third	O
parties	O
to	O
easily	O
extend	O
Roo	O
.	O
</s>
