CODEWITHSUNDEEP
javalinux
ha9u63a7
ha9u63a7

Reputation: 6864

Adding JAVA_HOME to Linux - correct way

I have downloaded oracle jdk tarball, and extracted it to /usr/lib/java/jdk1.8.0_172 directory.

I provided 755 permission to '/usr/lib/java/` directory recursively.

I then went ahead and changed my /etc/environment script to be:

JAVA_HOME="/usr/lib/java/jdk1.8.0"
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:$JAVA_HOME/bin"

Then typed:

source /etc/environment

and typed java -version to confirm that it's recognised.

Once I logged off, everything is gone. And I cannot even find this after opening a new shell. I want this to work for any user, but cannot remember whether i have to add this to .bashrc or some other file?

In other words, do i need to provide group access to this, or simply add the environment variables?

Upvotes: 0

Views: 25060

Answers (2)

mtj
mtj

Reputation: 3554

What I usually do is, add a file to /etc/profile.d, along the lines of

#!/bin/sh
export JAVA_HOME=/usr/java
export PATH=$PATH:$JAVA_HOME/bin

This should be executed for every user on login.

One additional thing is, that I normally install the respective "current" java version under /usr/local, e.g. /usr/local/jdk1.8.0_172 and softlink this to /usr/java. That way I can easily upgrade and eventually switch back and forth without modifying and /etc-scripts. (Note: probably the best practices today recommend other directories than the ones I usually use ...)

Upvotes: 2

ha9u63a7
ha9u63a7

Reputation: 6864

I have done the following in one go and it worked.

1) Added source /etc/environment to my /etc/profile

2) Typed source /etc/profile

3) exited the bash fully

4) Reopened the bash as sudo and typed java -version 

java version "1.8.0_172"
Java(TM) SE Runtime Environment (build 1.8.0_172-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.172-b11, mixed mode)

But I think this is also, because I provided 755 access to /usr/lib/java recursively.

I had to go this extra mile because I am doing a proper "Sandboxed" development in those machines which have only intranet connectivity, and cannot see past that firewall :( Otherwise, an sudo apt-get install openjdk-8-jdk-headless would be my prefered option.

Upvotes: 0

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