How to Install Oracle Java JDK on Ubuntu Linux

How to Install Oracle Java JDK on Ubuntu Linux

This tutorial will cover the installation of 32-bit and 64-bit Oracle Java 8 (currently version number 1.8.0_20) JDK on 32-bit and 64-bit Ubuntu operating systems. These instructions will also work on
Debian and Linux Mint.

This article is for those who only want to install the Oracle Java JDK with the Oracle Java JRE included in the JDK download. Instructions for how to install Oracle Java JDK only on Debian based Linux operating systems such as Debian, Ubuntu and
Linux Mint.

Steps

1
Check to see if your Ubuntu Linux operating system architecture is 32-bit or 64-bit, open up a terminal and run the following command below.

Type/Copy/Paste: file /sbin/init

Note the bit version of your Ubuntu Linux operating system architecture it will display whether it is 32-bit or 64-bit.

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2Check if you have Java installed on your system. To do this, you will have to run the Java version command from terminal.Open up a terminal and enter the following command:Type/Copy/Paste: java -version

If you have OpenJDK installed on your system it may look like this:java version "1.7.0_15"
OpenJDK Runtime Environment (IcedTea6 1.10pre) (7b15~pre1-0lucid1)
OpenJDK 64-Bit Server VM (build 19.0-b09, mixed mode)

If you have OpenJDK installed on your system, you have the wrong vendor version of Java installed for this exercise.



3Completely remove the OpenJDK/JRE from your system and create a directory to hold your Oracle Java JDK/JRE binaries. This will prevent system conflicts and confusion between different vendor versions of Java. For example, if you have the OpenJDK/JRE installed on your system, you can remove it by typing the following at the command line:Type/Copy/Paste: sudo apt-get purge openjdk-\*This command will completely remove OpenJDK/JRE from your system

Type/Copy/Paste: sudo mkdir -p /usr/local/javaThis command will create a directory to hold your Oracle Java JDK and JRE binaries.



4Download the Oracle Java JDK for Linux. Make sure you select the correctcompressed binaries for your system architecture 32-bit or 64-bit (which end in tar.gz).For example, if you are on Ubuntu Linux 32-bit operating system download 32-bit Oracle Java binaries.
For example, if you are on Ubuntu Linux 64-bit operating system download 64-bit Oracle Java binaries.
Optional, Download the Oracle Java JDK DocumentationSelect jdk-8u20-apidocs.zip

Important Information: 64-bit Oracle Java binaries do not work on 32-bit Ubuntu Linux operating systems, you will receive multiple system error messages, if you attempt to install 64-bit Oracle Java on 32-bit Ubuntu Linux.



5Copy the Oracle Java binaries into the /usr/local/java directory. In most cases, the Oracle Java binaries are downloaded to: /home/"your_user_name"/Downloads.32-bit Oracle Java on 32-bit Ubuntu Linux installation instructions:Type/Copy/Paste: cd /home/"your_user_name"/Downloads
Type/Copy/Paste: sudo cp -r jdk-8u20-linux-i586.tar.gz /usr/local/java/
Type/Copy/Paste: cd /usr/local/java

64-bit Oracle Java on 64-bit Ubuntu Linux installation instructions:Type/Copy/Paste: cd /home/"your_user_name"/Downloads
Type/Copy/Paste: sudo cp -r jdk-8u20-linux-x64.tar.gz /usr/local/java/
Type/Copy/Paste: cd /usr/local/java



6Unpack the compressed Java binaries, in the directory /usr/local/java32-bit Oracle Java on 32-bit Ubuntu Linux installation instructions:Type/Copy/Paste: sudo tar xvzf jdk-8u20-linux-i586.tar.gz

64-bit Oracle Java on 64-bit Ubuntu Linux installation instructions:Type/Copy/Paste: sudo tar xvzf jdk-8u20-linux-x64.tar.gz



7Double-check your directories. At this point, you should have two uncompressed binary directories in /usr/local/java for the Java JDK/JRE listed as:Type/Copy/Paste: ls -a
jdk1.8.0_20
jre1.8.0_20



8Edit the system PATH file /etc/profile and add the following system variables to your system path. Use nano, gedit or any other text editor, as root, open up /etc/profile.Type/Copy/Paste: sudo gedit /etc/profile
or
Type/Copy/Paste: sudo nano /etc/profile



9Scroll down to the end of the file using your arrow keys and add the following lines below to the end of your /etc/profile file:Type/Copy/Paste:

J***A_HOME=/usr/local/java/jdk1.8.0_20
PATH=$PATH:$HOME/bin:$J***A_HOME/bin
export J***A_HOME
export PATH



10Save the /etc/profile file and exit.


11Inform your Ubuntu Linux system where your Oracle Java JDK/JRE is located. This will tell the system that the new Oracle Java version is available for use.Type/Copy/Paste: sudo update-alternatives --install "/usr/bin/java" "java" "/usr/local/java/jdk1.8.0_20/bin/java" 1this command notifies the system that Oracle Java JRE is available for use

Type/Copy/Paste: sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/local/java/jdk1.8.0_20/bin/javac" 1this command notifies the system that Oracle Java JDK is available for use

Type/Copy/Paste: sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/local/java/jdk1.8.0_20/bin/javaws" 1this command notifies the system that Oracle Java Web start is available for use



12Inform your Ubuntu Linux system that Oracle Java JDK/JRE must be the default Java.Type/Copy/Paste: sudo update-alternatives --set java /usr/local/java/jdk1.8.0_20/bin/javathis command will set the java runtime environment for the system

Type/Copy/Paste: sudo update-alternatives --set javac /usr/local/java/jdk1.8.0_20/bin/javacthis command will set the javac compiler for the system

Type/Copy/Paste: sudo update-alternatives --set javaws /usr/local/java/jdk1.8.0_20/bin/javawsthis command will set Java Web start for the system



13Reload your system wide PATH /etc/profile by typing the following command:Type/Copy/Paste: source /etc/profile
Note your system-wide PATH /etc/profile file will reload after reboot of your Ubuntu Linux system



14Test to see if Oracle Java was installed correctly on your system. Run the following commands and note the version of Java:


15A successful installation of 32-bit Oracle Java will display:Type/Copy/Paste: java -versionThis command displays the version of java running on your system

You should receive a message which displays:java version "1.8.0_20"
Java(TM) SE Runtime Environment (build 1.8.0_20-b26)
Java HotSpot(TM) Server VM (build 25.20-b23, mixed mode)

Type/Copy/Paste: javac -versionThis command lets you know that you are now able to compile Java programs from the terminal.

You should receive a message which displays:javac 1.8.0_20



16A successful installation of Oracle Java 64-bit will display:Type/Copy/Paste: java -versionThis command displays the version of java running on your system

You should receive a message which displays:java version "1.8.0_20"
Java(TM) SE Runtime Environment (build 1.8.0_20-b26)
Java HotSpot(TM) Server VM (build 25.20-b23, mixed mode)

Type/Copy/Paste: javac -versionThis command lets you know that you are now able to compile Java programs from the terminal.

You should receive a message which displays:javac 1.8.0_20



17Congratulations, you just installed Oracle Java on your Linux system.Now reboot your Ubuntu Linux system. Afterwards, your system will be fully configured for running and developing Java programs. Later on you may want to try compiling and running your own Java programs by following this article How to Create your First Java Program on Ubuntu LinuxAd

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Optional: How to enable Oracle Java in your Web Browsers

To enable your Java plug-in in your web browsers you must make a symbolic link from the web browsers plug-in directory to the location of the Java plug-in included in your distribution of Oracle Java.

Important Note: I would urge caution when enabling Oracle Java 7 in your web browsers, due to the fact there have been many numerous security flaws and exploits. Essentially, by enabling Oracle Java 7
in your web browsers if a security flaw or exploit is discovered this is how the bad guys break in and compromise your system. For more information on security flaws and exploits in Java see the following website: Java
Tester

Google Chrome

32-bit Oracle Java instructions:

Issue the following commands.

Type/Copy/Paste: sudo mkdir -p /opt/google/chrome/plugins

this will create a directory called /opt/google/chrome/plugins

Type/Paste/Copy: cd /opt/google/chrome/plugins

this will change you into the google chrome plugins directory,make sure you are in this directory before you make the symbolic link

Type/Paste/Copy: sudo ln -s /usr/local/java/jdk1.8.0_20/jre/lib/i386/libnpjp2.so

this will create a symbolic link from the Java JRE( Java Runtime Environment ) plugin libnpjp2.so to your Google Chrome web browser

64-bit Oracle Java instructions:

Issue the following commands.

Type/Copy/Paste: sudo mkdir -p /opt/google/chrome/plugins

this will create a directory called /opt/google/chrome/plugins

Type/Paste/Copy: cd /opt/google/chrome/plugins

this will change you into the google chrome plugins directory,make sure you are in this directory before you make the symbolic link

Type/Paste/Copy: sudo ln -s /usr/local/java/jdk1.8.0_20/jre/lib/amd64/libnpjp2.so

this will create a symbolic link from the Java JRE( Java Runtime Environment ) plugin libnpjp2.so to your Google Chrome web browser

Reminders:

Note: Sometimes when you issue the above command you may receive a message which states:

ln: creating symbolic link `./libnpjp2.so': File exists
To correct this issue simply remove the previous symbolic link using the following command:
Type/Copy/Paste: cd /opt/google/chrome/plugins
Type/Copy/Paste: sudo rm -rf libnpjp2.so
Make sure you are in the /opt/google/chrome/plugins directory before you issue the command

Restart your web browser and go to Java Tester to test
if Java is functioning in your web browser.

Mozilla Firefox

32-bit Oracle Java instructions:

Issue the following commands.

Type/Paste/Copy: cd /usr/lib/mozilla/plugins

this will change you into the directory /usr/lib/mozilla/plugins, create this directory if you do not have it

Type/Paste/Copy: sudo mkdir -p /usr/lib/mozilla/plugins

this will create the directory /usr/lib/mozilla/plugins, make sure you are in this directory before you make the symbolic link

Type/Paste/Copy: sudo ln -s /usr/local/java/jdk1.8.0_20/jre/lib/i386/libnpjp2.so

this will create a symbolic link from the Java JRE( Java Runtime Environment ) plugin libnpjp2.so to your Mozilla Firefox web browser

64-bit Oracle Java instructions:

Issue the following commands.

Type/Paste/Copy: cd /usr/lib/mozilla/plugins

this will change you into the directory /usr/lib/mozilla/plugins, create this directory if you do not have it

Type/Paste/Copy: sudo mkdir -p /usr/lib/mozilla/plugins

this will create the directory /usr/lib/mozilla/plugins, make sure you are in this directory before you make the symbolic link

Type/Paste/Copy: sudo ln -s /usr/local/java/jdk1.8.0_20/jre/lib/amd64/libnpjp2.so

this will create a symbolic link from the Java JRE( Java Runtime Environment ) plugin libnpjp2.so to your Mozilla Firefox web browser

Reminders:

Note: Sometimes when you issue the above command you may receive a message which states:

ln: creating symbolic link `./libnpjp2.so': File exists
To correct this issue simply remove the previous symbolic link using the following command:
Type/Copy/Paste: cd /usr/lib/mozilla/plugins
Type/Copy/Paste: sudo rm -rf libnpjp2.so
Make sure you are in the /usr/lib/mozilla/plugins directory before you issue the command

Restart your web browser and go to Java Tester to test
if Java is functioning in your web browser.

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