Unable to change java version GNU/linux

Question

Tried setting sym links and all but didn't work. It is pointing to a read only file system.

bash-4.1$ sudo ln -s /scratch/mbhamba/work/jdk1.8.0_40/bin/java /usr/bin/java

bash-4.1$ which java /usr/dev_infra/platform/bin/java bash-4.1$ sudo rm -f /usr/dev_infra/platform/bin/java rm: cannot remove /usr/dev_infra/platform/bin/java': Read-only file system

bash-4.1$ sudo ln -sf /scratch/mbhamba/work/jdk1.8.0_40/bin/java /usr/dev_infra/platform/bin/java ln: cannot remove /usr/dev_infra/platform/bin/java': Read-only file system

instead of trying to remove or soft link the path , add the new path to the $PATH variable at start — Pradheep
– Pradheep, Commented Jul 1, 2015 at 5:59

Elliott Frisch · Accepted Answer · 2015-07-01 06:04:36Z

6

I suggest you set (and use) the environment variables JAVA_HOME¹ and PATH² (with bash, you can usually set them in your $HOME/.bashrc)

export JAVA_HOME="/scratch/mbhamba/work/jdk1.8.0_40"
export PATH="$JAVA_HOME/bin:$PATH"

^{1_{The Java home variable is honored by JBoss and eclipse (as well as other common Java projects & containers).}}
^{2_{The PATH controls where, and the order in which, bash looks for executable commands.}}

answered Jul 1, 2015 at 6:04

Elliott Frisch

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SubOptimal · Accepted Answer · 2015-07-01 06:01:01Z

1

I would propose another solution, without touching the system default /usr/bin/java.

Change for the user mbhamba the login script and amend the PATH setting to

export PATH=/scratch/mbhamba/work/jdk1.8.0_40/bin/:${PATH}

That way the JDK 1.8.0_40 would be taken if you compile and execute your code.

answered Jul 1, 2015 at 6:01

SubOptimal

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