Is JAVA_HOME environment variable really required to run ElasticSearch?

Question

As per title, is it really required to have JAVA_HOME set on the host PC? Can I run ElasticSearch by just specyfing the full path of the java.exe vm?

you need at minimum JRE to run elasticSearch. java.exe and jre are the same. — logger
– logger, Commented Mar 13, 2017 at 15:18
ok thanks, so there is no need for JAVA_HOME to be set, right? — Gianluca Ghettini
– Gianluca Ghettini, Commented Mar 13, 2017 at 15:25

Adonis · Accepted Answer · 2017-03-13 15:31:29Z

2

Not exactly, if you look at the starting script of elasticsearch:

if [ -x "$JAVA_HOME/bin/java" ]; then
    JAVA="$JAVA_HOME/bin/java"
else
    JAVA=`which java`
fi

So basically, either you have $JAVA_HOME set, or you have installed Java in your system and the system knows its location (the which java should at least return a path when ran in a shell, something like /usr/bin/java)

answered Mar 13, 2017 at 15:31

Adonis

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2 Comments

Gianluca Ghettini Over a year ago

Ok thanks, but I guess I can modify the script and point it to a known location of java. I know it sounds weird and it's not recommended but I can just modify the script and not use the JAVA_HOME

Adonis Over a year ago

Yes you can, the only thing you have to be careful of is when upgrading to new version

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