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Setting the Runtime Java Environment

The version of Java used to compile REEF is controlled in the Maven pom.xml file in the build plugins section under the maven-compiler-plugin artifact identifier. In order to run REEF applications, you must set the JAVA_HOME environment variable to the correct Java installation directory for your operating system and java version.

Linux

On a number of Linux distributions such as Ubuntu, the current active version of Java is controlled via links from /usr/bin set by the update-alternatives command; thus, the value of JAVA_HOME that causes REEF to use the Java version controlled by update-alternatives is given in the code block below. REEF will concatenate the appropriate path to find executable files. 

bash script to set JAVA_HOME

 

export JAVA_HOME=/usr

 

You can change the active version of Java controlled by update-alternatives by entering the command below and selecting the desired version from the displayed list.

bash script to list all installed Java versions on Linux

 

update-alternatives --config java