Java - JAVA_HOME
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The JAVA_HOME is an environment variable that gives the path of a jdk or jre installation.
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Example
Windows Dos
set JAVA_HOME="C:\Program Files\Java\jdk1.8.0_45"
echo %JAVA_HOME%
C:\Program Files\Java\jdk1.8.0_45
Linux Bash
export JAVA_HOME=/usr/java/jdk1.5.0_07/bin/java