Installing Scala on the Raspberry PI

 

Start out with a vanilla version of Raspbian, this already will have Oracle Java installed

 

Now being an old fashioned kind of guy I like to find my Raspberry PI where I left it, and to do this I like to have a static IP address. In Raspbian its pretty simple to set up

 

just edit the /etc/network/interfaces file

 

sudo vi /etc/network/interfaces

 

then replace the lines:

 

iface eth0 inet dhcp

 

with

 

iface eth0 inet static

address 192.168.1.1

netmask 255.255.255.0

gateway 192.168.1.254

 

obviously changing the ip addresses so they match your network preferences. Then double check for typos, and correct if necessary then reboot

 

 

the next step is to down load sbt, sbt is the Scala Build Tool, it will manage dependencies in a very maven like manner. Here I am downloading 0.13.1-RC5 but download the latest and greatest by checking the parent directory in a web browser.

 

cd ~

wget http://scalasbt.artifactoryonline.com/scalasbt/sbt-native-packages/org/scala-sbt/sbt/0.13.1-RC5/sbt.deb

sudo dpkg -i sbt.deb

 

Now its time to run up sbt; since we are on a PI lets set the memory to something a little bit more manageable:

 

sbt – mem 128

 

Now go get a cup of tea while sbt does its magic

 

now we should be presented with

 

[info] Set current project to pi (in build file:/home/pi/)

>

 

now type in console to start the repl

> console

[info] Starting scala interpreter…

[info]

Welcome to Scala version 2.10.3 (Java HotSpot(TM) Client VM, Java 1.7.0_40).

Type in expressions to have them evaluated.

Type :help for more information.

 

scala>

 

so now we can add 1+1 and 2, or One + One and get OneOne

 

 

scala> 1+1

res0: Int = 2

 

scala> “One” + “One”

res2: String = OneOne

 

 

Next time I will do something a little more fun.