Basically during this session I've been trying to convince room full of .js devs that using java has its advantages. I know that many things may not make sense without me talking, so just as a DISCLAIMER: I know that most (if not all) of that can be done in node.js In most cases my point was that it could be done in different way, nad it's worth remembering that Abstract: We're living in a fast moving world. Javascript is everywhere and can do anything, from adding widgets to your desktop to controlling your TV, however some developers still don't treat it seriously. Number of frameworks grows, there is node.js, languages compiling to Javascript, but despite all of that we still struggle with weird superstitions. During the course of the session I'll try to give very brief overview of Nashorn and explain why in my eyes it can be a game changer that will allow us to add .js to "enterprise languages", and that opens whole new world :) We'll also dive a bit into architecture of applications, talk about testability and polyglot programming to finish with real world example of application built using Nashorn, just to prove that highly specialized, mission critical software can benefit a lot from using .js.

1. Excellence in
Software Engineering
Project Nashorn –
why should we
care
@michalgruca

2. Excellence in Software Engineering

3. What is Nashorn
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4. Whats the fuss all about
● Yet another js runtime -> on server
● Quite fast
● Built on top of Java
● EcmaScript 5.1 compatible
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5. Excellence in Software Engineering @michalgruca 5
But Node
● Mature
● Tested
● Has ecosystem (modules)
● Fast!
V8 powered

6. It's different architecture than Node!
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7. Excellence in Software Engineering @michalgruca 7
Threads!

8. But WHY to use it?!
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9. Access to JVM!
JVM
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10. Excellence in Software Engineering @michalgruca 10
Really
Java
http://lustich.de/bilder/tiere/really-dog/

11. Avatar.js
AAvvaattaarr..jjss iiss aa pprroojjeecctt ttoo bbrriinngg tthhee nnooddee
pprrooggrraammmmiinngg mmooddeell,, AAPPIIss aanndd mmoodduullee eeccoossyysstteemm
ttoo tthhee JJaavvaa ppllaattffoorrmm,, eennaabblliinngg aa nneeww ccllaassss ooff
hhyybbrriidd sseerrvveerr aapppplliiccaattiioonnss tthhaatt ccaann lleevveerraaggee ttwwoo ooff
tthhee mmoosstt ppooppuullaarr pprrooggrraammmmiinngg llaanngguuaaggeess aanndd
eeccoossyysstteemmss ttooddaayy..
TThheessee JJaavvaa++JJaavvaaSSccrriipptt aapppplliiccaattiioonnss ccaann
lleevveerraaggee ccaappaabbiilliittiieess ooff bbootthh eennvviirroonnmmeennttss --
aacccceessss tthhee llaatteesstt nnooddee ffrraammeewwoorrkkss wwhhiillee ttaakkiinngg
aaddvvaannttaaggee ooff tthhee JJaavvaa ppllaattffoorrmm''ss ssccaallaabbiilliittyy,,
mmaannaaggeeaabbiilliittyy,, ttoooollss,, aanndd eexxtteennssiivvee ccoolllleeccttiioonn ooff
JJaavvaa lliibbrraarriieess aanndd mmiiddddlleewwaarree..
https://avatar-js.java.net/
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12. Excellence in Software Engineering @michalgruca 12
Avatar.js
https://avatar-js.java.net/

13. Compatible with existing Java applications
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14. Allows to create Java in Js
DEMO
https://github.com/mgruca/nashorn_example/blob/master/src/main/test/pl/rits/Runner.java#L19
https://github.com/mgruca/nashorn_example/blob/master/src/main/test/pl/rits/Runner.java#L25
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15. EEnntteerrpprriissee
rreeaaddyy
By Takashi Hososhima
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16. Enterprise?
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Big stuff

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Libs

19. Security & Crypto
XX..550099
PPKKII
SS//MMIIMMEE
OOppeenn//PPGGPP
HHaasshhiinngg aallggoorriitthhmmss
PPKKCCSS##1100
PPKKCCSS##1122
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20. Excellence in Software Engineering @michalgruca 20
XML!
● SAX
●Dom
● STaX
● ...
● ...
● Bindings
● You name it!

21. Office support
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22. Excellence in Software Engineering @michalgruca 22
Desktop
By Moriline: http://en.wikipedia.org/wiki/NetBeans#mediaviewer/File:Gui-builder.png

23. Allows OS scripting!
DEMO
https://github.com/mgruca/nashorn_example/blob/master/scripts/fx.sh
https://github.com/mgruca/nashorn_example/blob/master/scripts/sample.sh
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24. Excellence in Software Engineering @michalgruca 24
IO
● Channels
● Streams
● Buffers
● Readers / Writers
● Blocking / Non blocking

25. Testing and verification
DEMO
https://github.com/mgruca/nashorn_example/blob/master/src/main/test/pl/rits/Runner.java#L48
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26. Access to all platforms and H/W
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27. Polyglot enabled
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28. Excellence in Software Engineering @michalgruca 28
cons
By Hans Hillewaert

29. Slower than Node
May be twice+ slower than V8
http://ariya.ofilabs.com/2014/03/nashorn-the-new-rhino-on-the-block.html
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30. Mean time in Java land
www.techempower.com/benchmarks
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31. Java experts necessary
2
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32. Can be tricky
By Yoel Ben-Avraham
Demo: https://github.com/mgruca/nashorn_example/blob/master/src/main/test/pl/rits/Runner.java#L42
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33. Real world examples
WWhhaatt ccaann wwee ddoo wwiitthh iitt??
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34. My project
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35. Questions
By Xurble
https://www.flickr.com/photos/xurble/376588066/
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36. I love feedback! :)
@michalgruca
michal.gruca@gmail.com
www.rits.pl
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