I am using Linux Mint Cinnamon 14. I have set the $JAVA_HOME
and $PATH
environment variables in ~/.profile
as follows:
export JAVA_HOME=/home/aqeel/development/jdk/jdk1.6.0_35
export PATH=/home/aqeel/development/jdk/jdk1.6.0_35/bin:$PATH
I then did source ~/.profile
to make the proper changes.
When I execute java -version
command to check the active java version, it shows the default (already installed open-jdk) java version. How can I override the default open-jdk with the one I downloaded?
UPDATE:
which java
says /usr/bin/java
$JAVA_HOME/bin/java -version
says 'Permission Denied'
sudo $JAVA_HOME/bin/java -version
(asks for password, then) says Command not found
but cd $JAVA_HOME/bin
, and ls
shows that it is right directory.
This question is related to
java
linux
environment-variables
linux-mint
When it searches for java it looks from left to right in path entries which are separated by : so you need to add the path of latest jdk/bin directory before /usr/bin, so when it searches it'll find the latest one and stop searching further.
i.e. PATH=/usr/java/jdk_1.8/bin:/usr/bin:..... and so on.
then initialize user profile using command: source ~/.bash_profile
and check with: [which java]
you'll get the right one.
Updating the ~/.profile
or ~/.bash_profile
does not work sometimes. I just deleted JDK 6 and source
d .bash_profile
.
Try running this:
sudo rm -rd jdk1.6.0_* #it may not let you delete without sudo
Then, modify/add your JAVA_HOME and PATH variables.
source ~/.bash_profile #assuming you've updated $JAVA_HOME and $PATH
If you want to use JDKs downloaded from Oracle's site, what worked for me (using Mint) is using update-alternatives:
I ran:
sudo update-alternatives --install /usr/bin/java java /home/aqeel/development/jdk/jdk1.6.0_35/bin/java 1
Now you can execute sudo update-alternatives --config java
and choose your java version.
export JAVA_HOME="/home/aqeel/development/jdk/jdk1.6.0_35"
statementNow, I had two JDKs downloaded (let's say the second has been extracted to /home/aqeel/development/jdk/jdk-10.0.1).
How can we change the JAVA_HOME dynamically based on the current java being used?
My solution is not very elegant, I'm pretty sure there are better options out there, but anyway:
To change the JAVA_HOME dynamically based on the chosen java alternative, I added this snippet to the ~/.bashrc:
export JAVA_HOME=$(update-alternatives --query java | grep Value: | awk -F'Value: ' '{print $2}' | awk -F'/bin/java' '{print $1}')
Finally (this is out of the scope) if you have to change the java version constantly, you might want to consider:
Adding an alias to your ~./bash_aliases:
alias change-java="sudo update-alternatives --config java"
(You might have to create the file and maybe uncomment the section related to this in ~/.bashrc)
In Linux Mint 18 Cinnamon be sure to check /etc/profile.d/jdk_home.sh I renamed this file to jdk_home.sh.old and now my path does not keep getting overridden and I can call java -version and see Java 9 as expected. Even though I correctly selected Java 9 in update-aternatives --config java
this jdk_home.sh file kept overriding the $PATH on boot-up.
Try this:
Reason: there could be other PATH elements point to alternative java home. If you put first your preferred JAVA_HOME, the system will use this one.
$JAVA_HOME/bin/java -version says 'Permission Denied'
If you cannot access or run code, it which be ignored if added to your path. You need to make it accessible and runnable or get a copy of your own.
Do an
ls -ld $JAVA_HOME $JAVA_HOME/bin $JAVA_HOME/bin/java
to see why you cannot access or run this program,.
check available Java versions on your Linux system by using update-alternatives command:
$ sudo update-alternatives --display java
Now that there are suitable candidates to change to, you can switch the default Java version among available Java JREs by running the following command:
$ sudo update-alternatives --config java
When prompted, select the Java version you would like to use.1 or 2 or 3 or etc..
Now you can verify the default Java version changed as follows.
$ java -version
update-java-alternatives
The java
executable is not found with your JAVA_HOME
, it only depends on your PATH
.
update-java-alternatives
is a good way to manage it for the entire system is through:
update-java-alternatives -l
Sample output:
java-7-oracle 1 /usr/lib/jvm/java-7-oracle
java-8-oracle 2 /usr/lib/jvm/java-8-oracle
Choose one of the alternatives:
sudo update-java-alternatives -s java-7-oracle
Like update-alternatives
, it works through symlink management. The advantage is that is manages symlinks to all the Java utilities at once: javac
, java
, javap
, etc.
I am yet to see a JAVA_HOME
effect on the JDK. So far, I have only seen it used in third-party tools, e.g. Maven.
There is an easy way, just remove the symbolic link from "/usr/bin". It will work.
Source: Stackoverflow.com