How to determine JAVA_HOME on Debian/Ubuntu?

Solution 1:

For the JRE, something like this should do the trick:

JAVA_HOME=$(readlink -f /usr/bin/java | sed "s:bin/java::")

Solution 2:

danadam's solution can easily be adopted to retrieve the JDK (i.e. not JRE) path as required:

JAVA_HOME=$(readlink -f /usr/bin/javac | sed "s:/bin/javac::")

• Looks for javac Java compiler (instead of java) included in JDK (but not JRE).
• Has no trailing / (stripped off by sed s:/bin... instead of s:bin...)

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Solution 3:

export JAVA_HOME=$(dirname $(dirname $(readlink -f /usr/bin/java)))

In .bashrc was handy for me.

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Solution 4:

So, you're saying that this command does nothing for you?

sudo update-alternatives --config java 

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Solution 5:

I installed java with

sudo apt-get install openjdk-7-jre-headless

and then to find the location

ls -al /etc/alternatives/java