Absorbing Scala Into Java Ecosystem

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Eishay Smith

Absorbing Scala In the Java Ecosystem

Technology

Who Am I

kaChing - Rocking the inventing world !
Ex - Scala @ LinkedIn
Blogging http://www.eishay.com
Also today:
"A First Look at Scala on Google App Engine"

On the menu

Getting started
Scala and Java
Runtime
Build
IDEs
Test
People

Getting started

Silicon Valley Base camp '08
David Pollak, Bill Venners
BASE: Bay Area Scala Enthusiasts
Once a month
Twitter (San Francisco)
LinkedIn (Mountain View)
Java Posse
Blogs and Twitter

Scala and Java

Different syntax and philosophy
Unlike the Groovy (which we love !) you can't write
Java syntax in Scala

Better interoperability
Compiles to the same classes and interfaces
Given a Jar its hard to tell where it came from
Type safe
Easily sharing libraries, both ways
Profiling, JMX, Serialization ....

Runtime

Behave the same on runtime
Your SysAdmin/Ops won't tell the diferance
As fast as Java
Static types, no introspection (see dynamic
languages)
Using primitives (though they look like objects)
Better concurrency patterns (see Actors)
Taking advantage of the JIT
Makes the GC happy (immutability FTW)

Build

Scalac knows
how to read
java code !
Needed for
circular
dependencies.

Testing

Scala has some great Testing frameworks
Specs, ScalaTest
They do integrate nicely with existing frameworks
Can use bare bones JUnit (any version)
ANT JUnit plugin does not work with Scala Sources
But does work with class files
JUnit may use static suite() methods in the test class
Problem: no static methods in Scala
There is a solution

Your organization

Integrating smartly with current Java project
Use one way dependency
Keeping the Scala illiterate IDEs happy
Not everyone will jump on the wagon
Take advantage on your IoC framework
Spring/Guice
Use Java interfaces to make the IDE happy

IDEs

Good Support by the three big IDEs out there
Eclipse, NetBeans and IDEA
Healthy competition
Soon to come: better IDE support
Martin Ordersky is working on improving the IDE
support with better compiler infrastructure
Scala plugin does not come with the IDE
Other team members may not install it

Get people interested

Host a Scala BASE
Invite Scala Speakers
Lunchtime talks

TShirts

Getting started (for real this time)

Scala is more then just nice syntax
You may start writing Java code in Scala
Start with testing
Not with production code
Test Java code from Scala
Once way dependency
Absorb Scala slowly, don't get drunk !
Your first Scala code will not be perfect
It takes a while to understand the Scala philosophy

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Absorbing Scala Into Java Ecosystem

1. Absorbing Scala in the Java Ecosystem Eishay Smith kaChing

2. Who Am I kaChing - Rocking the inventing world ! Ex - Scala @ LinkedIn Blogging http://www.eishay.com Also today: "A First Look at Scala on Google App Engine"

3. On the menu Getting started Scala and Java Runtime Build IDEs Test People

4. Getting started Silicon Valley Base camp '08 David Pollak, Bill Venners BASE: Bay Area Scala Enthusiasts Once a month Twitter (San Francisco) LinkedIn (Mountain View) Java Posse Blogs and Twitter

5. Scala and Java Different syntax and philosophy Unlike the Groovy (which we love !) you can't write Java syntax in Scala Better interoperability Compiles to the same classes and interfaces Given a Jar its hard to tell where it came from Type safe Easily sharing libraries, both ways Profiling, JMX, Serialization ....

6. Runtime Behave the same on runtime Your SysAdmin/Ops won't tell the diferance As fast as Java Static types, no introspection (see dynamic languages) Using primitives (though they look like objects) Better concurrency patterns (see Actors) Taking advantage of the JIT Makes the GC happy (immutability FTW)

7. Build Scalac knows how to read java code ! Needed for circular dependencies.

8. Testing Scala has some great Testing frameworks Specs, ScalaTest They do integrate nicely with existing frameworks Can use bare bones JUnit (any version) ANT JUnit plugin does not work with Scala Sources But does work with class files JUnit may use static suite() methods in the test class Problem: no static methods in Scala There is a solution

9. JUnit, ANT & Scala Instead of Use

10. Getting around static methods

11. Your organization Integrating smartly with current Java project Use one way dependency Keeping the Scala illiterate IDEs happy Not everyone will jump on the wagon Take advantage on your IoC framework Spring/Guice Use Java interfaces to make the IDE happy

12. IDEs Good Support by the three big IDEs out there Eclipse, NetBeans and IDEA Healthy competition Soon to come: better IDE support Martin Ordersky is working on improving the IDE support with better compiler infrastructure Scala plugin does not come with the IDE Other team members may not install it

13. Get people interested Host a Scala BASE Invite Scala Speakers Lunchtime talks TShirts

14. Getting started (for real this time) Scala is more then just nice syntax You may start writing Java code in Scala Start with testing Not with production code Test Java code from Scala Once way dependency Absorb Scala slowly, don't get drunk ! Your first Scala code will not be perfect It takes a while to understand the Scala philosophy

15. We Are Hiring !

Absorbing Scala Into Java Ecosystem

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