Javac with Oracle Embedded SE on Raspberry

Question

I'm trying to run Jenkins on my RaspberryPi. Therefore I installed Java (ejre-7u21-fcs-b11-linux-arm-vfp-client_headless-04_apr_2013.gz). But the compiler is missing (so no javac) is there a way to fix this.

I heard that Jenkins runs very slow with the OpenJDK and that is why this is not an option for me. Any suggestions what I might do to get the Java Compiler running on my raspberryPi with a Embedded Java Version from Oracle or just something that runs fast.

Thx

• Thorbjørn Ravn Andersen: The Pi most likely has too little RAM to do anything interesting from within Jenkins.

Answer 1

You don't need to use the "embedded SE" version of java on the pi. It is not really an embedded platform. It is a regular PC, albeit a minimal one.

WRT OpenJDK, it is actually a Sun/Oracle product, who of course own the java spec and the mainstream JRE/JDK. OpenJDK started as a fork of Sun java 7, I think primarily so it could have a GPL license. I.e., OpenJDK is essentially the open source version of Oracle java. The difference is more in the licensing than the code base.

I haven't seen any tests, but I would imagine the fastest java for the pi is the Oracle 8 preview (which is actually a binary compiled from openJDK with hardware float support). You may also want to look at this question.

But the compiler is missing

Make sure you download the JDK (devel kit) not just the JRE (runtime environment). This may also be a problem with javac not being in your $PATH, see my answer to that other question.

• Thorbjørn Ravn Andersen: The hard part is porting Hotspot to a new platform.
• goldilocks: Hotspot is the JVM. You don't need to acquire it separately, it's integral to the runtime environment and openJDK.

Answer 2

Oracle released Java 8 (and Java 7) for ARM. Use the Link from this Page to get the currently best Java version for your Raspberry Pi.

This should also work:

sudo apt-get update
sudo apt-get install oracle-java8-jdk