mraa-clj

mraa

prep

1. On the Edison set the environment var JAVA_HOME; on my Edison that’s /usr/lib/jvm/java-8-openjdk. Also add $JAVA_HOME/bin to the PATH.

2. Install boot on the Edison. If you get an SSL exception follow the instructions at Java cacerts on Intel Edisons and Gateways.

3. On the Edison, package the mraa jar (/usr/lib/java/mraa.jar) as a maven artifact and install in the local repository:

Warning

We’re using the root account on the Edison, since the mraa library must run as root in order to control the hardware. boot by default will refuse to run as root, so you’ll need to execute $ export BOOT_AS_ROOT=yes before running boot.

$ mkdir -p clj/mraa && cd clj/mraa
$ boot pom -p mraa/mraa -v 1.0.0 target
$ boot install -p target/META-INF/maven/mraa/mraa/pom.xml -f /usr/lib/java/mraa.jar
$ ls ~/.m2/repository/mraa/mraa/1.0.0
-rw-r--r-- 1 root root   160 Jul 14 14:25 _maven.repositories
-rw-r--r-- 1 root root 29038 Jun  6 22:37 mraa-1.0.0.jar
-rw-r--r-- 1 root root   484 Jul 14 14:25 mraa-1.0.0.pom
$ jar tf ~/.m2/repository/mraa/mraa/1.0.0/mraa-1.0.0.jar
META-INF/
META-INF/MANIFEST.MF
mraa/
mraa/IntelEdisonMiniboard.class
mraa/UartParity.class
mraa/Platform.class
mraa/I2cMode.class
mraa/Gpio.class
mraa/mraa.class
mraa/RaspberryWiring.class
mraa/I2c.class
mraa/mraaJNI.class
mraa/Edge.class
mraa/Pinmodes.class
mraa/IntelEdison.class
mraa/Spi.class
mraa/Mode.class
mraa/Dir.class
mraa/Pwm.class
mraa/Aio.class
mraa/Uart.class
mraa/Spi_Mode.class
mraa/Result.class
$ rm -rf target   # no longer needed

Doing it this way makes it easy to ensure the mraa classes are on the classpath by including the maven artifact as a project dependency in build.boot.