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Install OpenJdk-11 in Ubuntu

This tutorial will help you install OpenJDK 11 on your Ubuntu machine. For Windows, you can simply download the zip distributable provided ...

This tutorial will help you install OpenJDK 11 on your Ubuntu machine.

For Windows, you can simply download the zip distributable provided by RedHat at https://developers.redhat.com/products/openjdk/download.

Before you begin, change your user to root first.
sudo su -
Otherwise, append sudo on all the commands.

1. Update Ubuntu packages.

apt-get update

2. Make sure that you have OpenJDK packages.

This should always work on new Ubuntu installation (v20.x)

apt-cache search openjdk-11

3. Install Open JDK and JRE.

apt-get install openjdk-11-jdk openjdk-11-jre

4. Check the installed version.

java -version

5. Configure the default version (if you have more than 1 version).

update-alternatives --config java
If you only have 1 version, it will display a message "Nothing to configure", otherwise select the version that you want to use.

6. Set the JAVA_HOME environment.

Open the file ~/.profile
vi ~/.profile -- create the file if it doesn't exists
// append the following lines at the end of the file
JAVA_HOME=/usr/lib/jvm/java-11-openjdk-amd64
// add Java bin folder to Ubuntu's path
PATH=$JAVA_HOME\bin:$PATH

7. Check JAVA_HOME environment.

echo $JAVA_HOME

8. Restart Ubuntu.

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