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.
2
Check 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.
3
Completely 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/java
This command will create a directory to hold your Oracle Java JDK and
JRE binaries.
4
Download the Oracle Java JDK for
Linux. Make sure you select
thecorrectcompressed
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.
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.
5
Copy 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:
Run the following commands on the downloaded Oracle Java
tar.gz files. Make sure to do this as root in order to make them
executable for all users on your system. To open a root terminal type sudo -s
you will be prompted for your logon password.
32-bit Oracle Java on 32-bit Ubuntu Linux installation
instructions:
Unpack the compressed Java binaries, in the directory
/usr/local/java
32-bit Oracle Java on 32-bit Ubuntu Linux installation
instructions:
Type/Copy/Paste:sudo tar xvzf
jdk-7u45-linux-i586.tar.gz
64-bit Oracle Java on 64-bit Ubuntu Linux installation
instructions:
Type/Copy/Paste:sudo tar xvzf
jdk-7u45-linux-x64.tar.gz
8
Double-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
jdk1.7.0_45
9
Edit 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
10
Scroll 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:
Inform 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.
this command will set Java Web start for the
system
14
Reload your system wide PATH /etc/profile by typing the
following command:
Type/Copy/Paste:. /etc/profile
Note your system-wide PATH /etc/profile file will reload after reboot of
your Ubuntu Linux system
15
Test to see if Oracle Java was installed correctly on
your system.Run the following commands and note
the version of Java:
16
A successful installation of 32-bit Oracle Java will
display:
Type/Copy/Paste:java -version
This command displays the version of java running on your
system
You should receive a message which displays:
java version "1.7.0_45" Java(TM) SE Runtime
Environment (build 1.7.5_45-b18) Java HotSpot(TM)
Server VM (build 24.45-b08, mixed mode)
Type/Copy/Paste:javac -version
This command lets you know that you are now able to compile Java
programs from the terminal.
You should receive a message which displays:
javac 1.7.0_45
17
A successful installation of Oracle Java 64-bit will
display:
Type/Copy/Paste:java -version
This command displays the version of java running on your
system
You should receive a message which displays:
java version "1.7.0_45" Java(TM) SE Runtime
Environment (build 1.7.5_45-b18) Java HotSpot(TM)
64-Bit Server VM (build 24.45-b08, mixed mode)
Type/Copy/Paste:javac -version
This command lets you know that you are now able to compile Java
programs from the terminal.
You should receive a message which displays:
javac 1.7.5_40
18
Congratulations, 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 articleHow to Create your First Java Program on Ubuntu
Linux
