Installation and Configuration of JDK9 is step by step given below:
Install JDK9 in Ubuntu:
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java9-installerMake it as default:
sudo apt-get install oracle-java9-set-default
Changed in .bashrc, /etc/environment and also set default using
3 sections to change java configuration.
.bashrc:
export JAVA_HOME=/usr/lib/jvm/java-9-oracle
export PATH=$JAVA_HOME/bin:$PATH/ect/environment:
JAVA_HOME="/usr/lib/jvm/java-9-oracle"
PATH=$PATH:$JAVA_HOME/bin
Then run the following command and set
sudo update-alternatives --config java
sudo update-alternatives --config javac
Then run the command
source /etc/environmentCheck in terminal:
java -version
echo $JAVA_HOME
which java
which javacIssue#1:
Execute "source /etc/environment" in every shell where you want the variables to be updated:
$ source /etc/environment
Resource Link: https://stackoverflow.com/a/5994031
Issue#2:
Just write
JAVA_HOME="/usr/lib/jvm/java-9-oracle" on your /etc/environment, without the "export"
/etc/environment is supposed to contain a set of environment variables given as key=value pairs. It is not a shell script, so you can't use shell commands such as export in it.
Resource Link:
Issue#3:
To check if java is properly installed:
$ which java $ which javac
You should get similar output:
/usr/bin/java
Resource Link: https://stackoverflow.com/a/23124805
Issue#4:
To remove Oracle JDK completely, run the commands below:
Completely remove criteria:
sudo apt-get remove oracle-java9-installer
sudo apt-get remove --auto-remove oracle-java9-installer
sudo apt-get purge oracle-java9-installer
sudo apt-get purge --auto-remove oracle-java9-installer