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How to Install Java on Ubuntu, The Must Read Guide

install java on ubuntu

How to Install Java on Ubuntu!

Ubuntu is a well-known and efficient type of operating system. It was primarily created based on the distribution of Debian Linux. This kind of operating system had been used on huge numbers of web servers these days. This is the reason why more and more people are using this kind of system.

This operating system is also recognized because of its reliability and speed. You can have the chance to install many supporting software into this operating system to be used for several applications. Java is an important and commonly used programming language that supports huge numbers of operating system.

How to Install Java on Ubuntu

Do you want to have Java packages to be installed in your own Ubuntu operating system? If yes, then how are you going to do that? Well, there is nothing to worry about since the steps are very easy and simple. In this guide, you will learn simple yet effective steps on how to install Java on Ubuntu with the use of some commands.

Getting To Know What Apt-Get Is

Apt-get is a powerful command line program of Ubuntu. This program installs, upgrade some software packages at the same time remove those old ones. APT or Advanced Packaging Tool is a tool that can update the whole operating system.

Installing Default JRE/JDK on Ubuntu

Ubuntu 12.04 as well as its earlier version utilizes Open JDK 6 as their default version. Ubuntu 12.10 plus+ version utilizes the Open JDK 7.

Well, you can easily install such default Java. The first and initial step to upgrade the packages is to use the command; sudo apt-get install

After that, you may now see some terminal running commands the same as this:

selvakumar@noisalesteam2:~$ sudo apt-get update

[sudo] password for selvakumar:

Ign http://dl.google.com stable InRelease

Hit http://dl.google.com stable Release.gpg                                   

Hit http://security.ubuntu.com wily-security    InRelease                        

Hit http://dl.google.com stable Release                                      

Hit http://security.ubuntu.com wily-   security/main Sources            

Hit http://us.archive.ubuntu.com wily InRelease                               

Hit http://dl.google.com stable/main amd64 Packages                           

Hit http://security.ubuntu.com wily-   security/restricted Sources      

Hit http://security.ubuntu.com wily-security/universe Sources                 

Hit http://us.archive.ubuntu.com wily-updates InRelease                       

Hit http://security.ubuntu.com wily-security/multiverse Sources               

Hit http://us.archive.ubuntu.com wily-backports InRelease                     

Hit http://security.ubuntu.com wily-security/main amd64 Packages              

Hit http://security.ubuntu.com wily-security/restricted amd64 Packages        

Hit http://us.archive.ubuntu.com wily/main Sources  

…………..

Reading Packages list done….

Once this is already done, you need to determine whether the Java is already installed in the system or not. Part on how to install Java on Ubuntu is to make use of this command

java –version

If the Java is already installed in your operating system, command will be able to return to its java version. But, if it is not successfully installed, messages will be shown.

elvakumar@noisalesteam2:~$ java -version

The program ‘java’ can be found in the    following packages:

* default-jre

* gcj-4.9-jre-headless

* gcj-5-jre-headless

* openjdk-7-jre-headless

* gcj-4.8-jre-headless

* openjdk-6-jre-headless

* openjdk-8-jre-headless

When these messages appeared, it is a sign that Java is not successfully installed in your operating system. How to install java on Ubuntu –make use of the following commands

udo apt-get install default-jre

After using the command, you can now see some execution lines of the command like this

selvakumar@noisalesteam2:~$ sudo apt-get    install default-jre

[sudo] password for selvakumar:

Reading package lists… Done

Building dependency tree      

Reading state information… Done

The following packages were automatically    installed and are no longer required:

libntdb1 python-ntdb

Use ‘apt-get autoremove’ to remove them.

The following extra packages will be installed:

ca-certificates-java default-jre-headless  fonts-   dejavu-extra java-common

libatk-wrapper-java libatk-wrapper-java-jni     libgnomevfs2-0

libgnomevfs2-common libsctp1 lksctp-tools  openjdk-7-jre

openjdk-7-jre-headless tzdata tzdata-java

Suggested packages:

equivs libgnomevfs2-bin libgnomevfs2-extra   gamin fam gnome-mime-data

icedtea-7-plugin icedtea-7-jre-jamvm sun-java6-   fonts fonts-ipafont-gothic

fonts-ipafont-mincho ttf-wqy-microhei ttf-wqy-  zenhei fonts-indic

Recommended packages:

libgnome-2-0

The following NEW packages will be installed:

ca-certificates-java default-jre default-jre-   headless fonts-dejavu-extra

java-common libatk-wrapper-java libatk-wrapper-  java-jni libgnomevfs2-0

libgnomevfs2-common libsctp1 lksctp-tools   openjdk-7-jre

openjdk-7-jre-headless tzdata-java

The following packages will be upgraded:

tzdata

1 upgraded, 14 newly installed, 0 to remove and    71 not upgraded.

Need to get 42.0 MB of archives.

After this operation, 66.0 MB of additional d   disk space will be used.

Do you want to continue? [Y/n] Y

Get:1 http://us.archive.ubuntu.com/ubuntu/    wily/main libsctp1 amd64 1.0.16+dfsg-2 [8,414 B]

Get:2 http://us.archive.ubuntu.com/ubuntu/ wily/main java-common all 0.52 [131 kB]

Get:3 http://us.archive.ubuntu.com/ubuntu/     wily/main default-jre-headles

Now that it is done, Java is already installed in the operating system.

Apart from the above-mentioned commands, you can do some other installations. These installations are not as necessary however if for some instances you need them, you can just install the applications with the use of the commands which will be mentioned below.

Installation of Open JDK

In installing open JDK on your Ubuntu operating system, you can make use of the command below.

sudo apt-get install openjdk-7-jre

This kind of command can immediately install the Java Run Time Environment in your system. If the open JDK is properly installed, return messages will be like this

selvakumar@noisalesteam2:~$ sudo apt-get    install openjdk-7-jre

[sudo] password for selvakumar:

Reading package lists… Done

Building dependency tree      

Reading state information… Done

openjdk-7-jre is already the newest version.

openjdk-7-jre set to manually installed.

The following packages were automatically    installed and are no longer required:

libntdb1 python-ntdb

Use ‘apt-get autoremove’ to remove them.

0 upgraded, 0 newly installed, 0 to remove and 71 not upgraded.

If you require JDK to be installed, make use of the command below. This command can download and install packages.

sudo apt-get install openjdk-7-jdk

Installation of Oracle JDK

You can also install Oracle KDK to your Ubuntu operating system using the following command.

sudo apt-get install python-software-properties

sudo add-apt-repository ppa:webupd8team/java

sudo apt-get update

Installation of Oracle JDK 7

This version is still in use and if you want to download and then install it, makes use of the command below.

sudo apt-get install oracle-java7-installer

Installation of Oracle JDK 8

How to install Java on Ubuntu with Oracle JDK 8 – you can make use of the following command below.

 sudo apt-get install oracle-java8-installer

Managing Java

You can install different versions of Java to your Ubuntu operating system. However, if you have more than one type of Oracle Java version in your operating system, you need to select which of the versions for you to use. You can only do this by following the command below.

sudo update-alternatives –config java

This type of command will return the entire Java installation that you have. This will appear to be the same as below.

selvakumar@noisalesteam2:~$ sudo update-alternatives –config java

There are 2 choices for the alternative java (providing /usr/bin/java).

 

   Selection    Path                                               Priority   Status

————————————————————

 0            /usr/lib/jvm/java-8-oracle/jre/bin/java          1081      auto mode

 1            /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java   1071      manual mode

* 2            /usr/lib/jvm/java-8-    oracle/jre/bin/java          1081      manual mode

 

Press <enter> to keep the current choice[*], or type selection number:

You need to press the number in the lists to choose the desired Java version you want.

Setting the Home Environment of Java Variable

Part on how to install Java on Ubuntu is to set the home environment of Java Variable. In order to do this, you need to determine the java installation path. After that, execute the command mentioned below.

sudo update-alternatives –config java

The path of installation will be like this.

/usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java

                                 /usr/lib/jvm/java-8-oracle/jre/bin/java

After that, you can run this command in editing the path

sudo nano /etc/environment

The file will be opened and replaced with your chosen path. You need to copy and then paste your chosen path here.

JAVA_HOME=”Your selected path.”

Save your file. Reload it if necessary.

sudo nano /etc/environment   

Then, check your chosen path with the following command.

echo $JAVA_HOME

If it returned to the path of home set, it only means that you are setting the Java path correctly. If not, try to check again the above-mentioned steps and see if you were able to do it correctly.

There are different ways on how to install java on Ubuntu apart from the above-mentioned ways. However, it is considered the easiest and simplest means that will definitely help you to get into the right track of Java installation in your Ubuntu operating system