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.
2 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/JRE for Linux. Make sure you select the correct compressed 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/JRE Documentation
Select jdk-7u40-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.
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:
Type/Copy/Paste: cd /home/"your_user_name"/Downloads
Type/Copy/Paste: sudo cp -r jdk-7u45-linux-i586.tar.gz /usr/local/java
Type/Copy/Paste: sudo cp -r jre-7u45-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-7u45-linux-x64.tar.gz /usr/local/java
Type/Copy/Paste: sudo cp -r jre-7u45-linux-x64.tar.gz /usr/local/java
Type/Copy/Paste: cd /usr/local/java
6 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
Type/Copy/Paste: sudo tar xvzf jre-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
Type/Copy/Paste: sudo tar xvzf jre-7u45-linux-x64.tar.gz
7 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
jre1.7.0_45
8 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
9 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:
Type/Copy/Paste:
JAVA_HOME=/usr/local/java/jdk1.7.0_45
PATH=$PATH:$HOME/bin:$JAVA_HOME/bin
JRE_HOME=/usr/local/java/jre1.7.0_45
PATH=$PATH:$HOME/bin:$JRE_HOME/bin
export JAVA_HOME
export JRE_HOME
export PATH
10 Save the /etc/profile file and exit.
11 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.
Type/Copy/Paste: sudo update-alternatives --install "/usr/bin/java" "java" "/usr/local/java/jre1.7.0_45/bin/java" 1
this 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/jdk1.7.0_45/bin/javac" 1
this 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/jre1.7.0_45/bin/javaws" 1
this command notifies the system that Oracle Java Web start is available for use
12 Inform 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/jre1.7.0_45/bin/java
this command will set the java runtime environment for the system
Type/Copy/Paste: sudo update-alternatives --set javac /usr/local/java/jdk1.7.0_45/bin/javac
this command will set the javac compiler for the system
Type/Copy/Paste: sudo update-alternatives --set javaws /usr/local/java/jre1.7.0_45/bin/javaws
this command will set Java Web start for the system
13 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
14 Test to see if Oracle Java was installed correctly on your system. Run the following commands and note the version of Java:
15 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 1.7.0_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
16 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 1.7.0_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 1.7.0_45
17 Congratulations, you just installed Oracle Java on your Linux system. Now reboot your Ubuntu Linux system.
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
Edit 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/jre1.7.0_45/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/jre1.7.0_45/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.
EditMozilla 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/jre1.7.0_45/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/jre1.7.0_45/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.
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 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/JRE for Linux. Make sure you select the correct compressed 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/JRE Documentation
Select jdk-7u40-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.
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:
Type/Copy/Paste: cd /home/"your_user_name"/Downloads
Type/Copy/Paste: sudo cp -r jdk-7u45-linux-i586.tar.gz /usr/local/java
Type/Copy/Paste: sudo cp -r jre-7u45-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-7u45-linux-x64.tar.gz /usr/local/java
Type/Copy/Paste: sudo cp -r jre-7u45-linux-x64.tar.gz /usr/local/java
Type/Copy/Paste: cd /usr/local/java
6 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
Type/Copy/Paste: sudo tar xvzf jre-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
Type/Copy/Paste: sudo tar xvzf jre-7u45-linux-x64.tar.gz
7 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
jre1.7.0_45
8 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
9 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:
Type/Copy/Paste:
JAVA_HOME=/usr/local/java/jdk1.7.0_45
PATH=$PATH:$HOME/bin:$JAVA_HOME/bin
JRE_HOME=/usr/local/java/jre1.7.0_45
PATH=$PATH:$HOME/bin:$JRE_HOME/bin
export JAVA_HOME
export JRE_HOME
export PATH
10 Save the /etc/profile file and exit.
11 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.
Type/Copy/Paste: sudo update-alternatives --install "/usr/bin/java" "java" "/usr/local/java/jre1.7.0_45/bin/java" 1
this 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/jdk1.7.0_45/bin/javac" 1
this 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/jre1.7.0_45/bin/javaws" 1
this command notifies the system that Oracle Java Web start is available for use
12 Inform 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/jre1.7.0_45/bin/java
this command will set the java runtime environment for the system
Type/Copy/Paste: sudo update-alternatives --set javac /usr/local/java/jdk1.7.0_45/bin/javac
this command will set the javac compiler for the system
Type/Copy/Paste: sudo update-alternatives --set javaws /usr/local/java/jre1.7.0_45/bin/javaws
this command will set Java Web start for the system
13 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
14 Test to see if Oracle Java was installed correctly on your system. Run the following commands and note the version of Java:
15 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 1.7.0_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
16 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 1.7.0_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 1.7.0_45
17 Congratulations, you just installed Oracle Java on your Linux system. Now reboot your Ubuntu Linux system.
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
Edit 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/jre1.7.0_45/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/jre1.7.0_45/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.
EditMozilla 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/jre1.7.0_45/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/jre1.7.0_45/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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