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The version of Java used to compile REEF is controlled in the Maven pom.xml file in the build plugins section as the maven-compiler-plugin artifact identifier. The 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 in order to run REEF applications. On Ubuntu Linux, the current active version of Java is controlled via links from /usr/bin via the update-alternatives command thus the correct setting is given in the code block below. REEF will concatenate the appropriate path to find the appropriate executable files such as /usr/bin/java. 

Code Block
languagebash
titlebash script to set JAVA_HOME
export JAVA_HOME=/usr

On Windows, the JAVA_HOME environment variable is typically set by the Java installer to $SYSTEM_DRIVE\Program Files\Java\jdk[version number]. You can examine the value of JAVA_HOME on Windows by entering the following command in a powerShell console window.

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