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dhavalv/Find_Java_Path.md

Last active December 22, 2016 08:15
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Java installation and find path
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Find_Java_Path.md

You need to dig into symbolic links. Below is steps to get Java directory

Step 1:

$ whereis java
java: /usr/bin/java /etc/java /usr/share/java

That tells the command java resides in /usr/bin/java.

Dig again:

Step 2:

$ ls -l /usr/bin/java
lrwxrwxrwx 1 root root 22 2009-01-15 18:34 /usr/bin/java -> /etc/alternatives/java

So, now we know that /usr/bin/java is actually a symbolic link to /etc/alternatives/java.

Dig deeper using the same method above:

Step 3:

$ ls -l /etc/alternatives/java
lrwxrwxrwx 1 root root 31 2009-01-15 18:34 /etc/alternatives/java -> /usr/local/jre1.6.0_07/bin/java

So, thats the actual location of java: /usr/local/jre.....

You could still dig deeper to find other symbolic links.

Please use this command:

readlink -f $(which java)

It works for me with Ubuntu gnome.

On my computer the result is:

/usr/lib/jvm/java-7-oracle/jre/bin/java

Export alternatives path and set java sdk path to your alternatives

export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java
export ANDROID_HOME=/opt/android-sdk
export PATH=$PATH:$ANDROID_HOME/tools

sudo update-alternatives --set java /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java

Reload environment

source /etc/environment
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