Java and JVM based languages

JDKs

The following JDKs are installed:

  • OpenJDK 7
  • Oracle JDK 7
  • Oracle JDK 8

We provide the function jdk_switcher, available as a setup command, to choose the JDK for your builds. This function can take one of two commands, use or home:

  • use will select the given JDK by changing the java executables, and setting JAVA_HOME and JRE_HOME.
  • home will print out the value of JAVA_HOME for a given JDK (but make no modifications).

The valid values for use or home are openjdk7, oraclejdk7, and oraclejdk8. By default, OpenJDK 7 is selected. The following would be the resulting Java version, JAVA_HOME, and JRE_HOME for each JDK:

OpenJDK 7 (default)

jdk_switcher home openjdk7
# /usr/lib/jvm/java-7-openjdk-amd64
jdk_switcher use openjdk7
echo $JAVA_HOME
# /usr/lib/jvm/java-7-openjdk-amd64
echo $JRE_HOME
# /usr/lib/jvm/java-7-openjdk-amd64/jre
java -version
# java version "1.7.0_65"
# OpenJDK Runtime Environment (IcedTea 2.5.3) (7u71-2.5.3-0ubuntu0.14.04.1)
# OpenJDK 64-Bit Server VM (build 24.65-b04, mixed mode)

Oracle JDK 7

jdk_switcher home oraclejdk7
# /usr/lib/jvm/java-7-oracle
jdk_switcher use oraclejdk7
echo $JAVA_HOME
# /usr/lib/jvm/java-7-oracle
echo $JRE_HOME
# /usr/lib/jvm/java-7-oracle/jre
java -version
# java version "1.7.0_72"
# Java(TM) SE Runtime Environment (build 1.7.0_72-b14)
# Java HotSpot(TM) 64-Bit Server VM (build 24.72-b04, mixed mode)

Oracle JDK 8

jdk_switcher home oraclejdk8
# /usr/lib/jvm/java-8-oracle
jdk_switcher use oraclejdk8
echo $JAVA_HOME
# /usr/lib/jvm/java-8-oracle
echo $JRE_HOME
# /usr/lib/jvm/java-8-oracle/jre
java -version
# java version "1.8.0_25"
# Java(TM) SE Runtime Environment (build 1.8.0_25-b17)
# Java HotSpot(TM) 64-Bit Server VM (build 25.25-b02, mixed mode)

Build Tools

The following tools are preinstalled in our virtual machine. You can add them to your setup or test commands to start your build:

  • ant (1.9.2)
  • maven (3.1.1)
  • gradle (1.10)
  • sbt (0.13.5)
  • leiningen (2.4.0)

JVM based languages

Scala , Clojure, Groovy and other JVM based languages should be running fine on our systems as well. Let us know if you find something that doesn’t work as expected