How to install the JDK on Ubuntu Linux

Solution 1:

Referring to Ask Ubuntu question How to set JAVA_HOME for OpenJDK?,

How to install Open JDK (Java developement kit) in Ubuntu (Linux)?

1. Open Terminal from Application Dash or press Ctrl+Alt+T

2. Update repository:

   sudo add-apt-repository ppa:openjdk-r/ppa  # only Ubuntu 17.4 and earlier
   sudo apt update
   

3. Optional: To search available distributions of openjdk, use the following command:

   apt search openjdk
   

4. Install the appropriate version with the following command:

   sudo apt install openjdk-8-jdk
   sudo apt install openjdk-8-source #this is optional, the jdk source code
   

5. For JAVA_HOME (Environment Variable) type command as shown below, in "Terminal" using your installation path...

   export JAVA_HOME=/usr/lib/jvm/java-8-openjdk
   

   (Note: /usr/lib/jvm/java-8-openjdk is symbolically used here just for demostration. You should use your path as per your installation.)

6. For PATH (Environment Variable) type command as shown below, in Terminal:

   export PATH=$PATH:$JAVA_HOME/bin

7. To check your installation:

   java -version

Solution 2:

The following used to work before the Oracle Java license changes in early 2019.

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java7-installer

The PPA is discontinued, until the author finds a workaround for the license issues.

Solution 3:

You can install Oracle's JDK 1.7 fairly easily too; as an example this is how to install JDK 1.7.0_13;

• Download the JDK from Oracle's site. The download to the newest version is always linked from http://java.oracle.com.

As root, do;

cd /usr/local
tar xzf <the file you just downloaded>

As your normal user, add or change these two lines in your ~/.profile to point to the installation;

export JAVA_HOME=/usr/local/jdk1.7.0_13
export PATH=$PATH:$JAVA_HOME/bin

If it's an update, you may also want to remove the old java installation directory in /usr/local.

Log out and in again (or do . ~/.profile), and everything should just work.

The downside with Oracle's JDK is that it won't update with the rest of your system like OpenJDK will, so I'd mostly consider it if you're running programs that require it.

Solution 4:

In case you have already downloaded the ZIP file follow these steps.

Run the following command to unzip your file.

tar -xvf ~/Downloads/jdk-7u3-linux-i586.tar.gz
sudo mkdir -p /usr/lib/jvm/jdk1.7.0
sudo mv jdk1.7.0_03/* /usr/lib/jvm/jdk1.7.0/
sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk1.7.0/bin/java" 1
sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/jdk1.7.0/bin/javac" 1
sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/lib/jvm/jdk1.7.0/bin/javaws" 1

After installation is complete, set environment variables as follows.

Edit the system path in file /etc/profile:

sudo gedit /etc/profile

Add the following lines at the end.

JAVA_HOME=/usr/lib/jvm/jdk1.7.0
PATH=$PATH:$HOME/bin:$JAVA_HOME/bin
export JAVA_HOME
export PATH

Source: http://javaandme.com/

Solution 5:

Note: WebUpd8 team's PPA has been discontinued with effective from April 16, 2019. Thus this PPA doesn't have any Java files. More information can be found on PPA's page on Launchpad. Hence the below method no longer works and exists because of historical reasons.

If you want to install the latest JDK 1.8, use the webupd8team PPA.

Add the repository in your system:

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update

You can now install Oracle Java 8 using the following command:

sudo apt-get install oracle-java8-installer

This ppa repository also provides a package to set environment variables automatically. Just type:

sudo apt-get install oracle-java8-set-default