You can refer http://openjdk.java.net/
to know what is Open JDK. In this I will be installing Open jdk version 1.7.0_25
- You can download your referred version from http://www.oracle.com/technetwork/java/javase/downloads/index.html
- Once you download, uncompress the file using following
command
sudo tar -xvf jdk-7u25-<version>.tar.gz
JDK 7 package is extracted into /jdk1.7.0_25 directory.
- It is better to move the JDK 7 directory to /usr/lib via
following commands
sudo mv jdk1.7.0_25/ /usr/lib/jvm/jdk1.7.0_25
- Then run the following commands :
sudo update-alternatives --install “/usr/bin/javac” “javac” “/usr/lib/jvm/jdk1.7.0_25/bin/javac” 1
sudo update-alternatives --install “/usr/bin/javaws” “javaws” “/usr/lib/jvm/jdk1.7.0_25/bin/javaws” 1
- Then configure for the open jdk
For Java :
sudo update-alternatives --config java
This will output the following
There are 5 choices for the
alternative java (providing /usr/bin/java).
Selection Path
Priority Status
------------------------------------------------------------
0
/usr/lib/jvm/java-6-openjdk-amd64/jre/bin/java 1061 auto mode
1
/opt/java/jdk1.7.0_25/bin/java 1 manual
mode
2
/opt/java/jre1.7.0_25/bin/java 1 manual
mode
3
/usr/lib/jvm/java-6-openjdk-amd64/jre/bin/java 1061 manual
mode
* 4
/usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java 1051 manual
mode
5
/usr/lib/jvm/jdk1.7.0_25/bin/java 1 manual
mode
You have to
Press enter to keep
the current choice[*], or type selection number. In here I will be
entering * since I need the 4th option.
- For Javac :
sudo update-alternatives --config javac
This will output the following
There are 3 choices for the
alternative javac (providing /usr/bin/javac).
Selection Path
Priority Status
------------------------------------------------------------
0
/usr/lib/jvm/java-6-openjdk-amd64/bin/javac 1061 auto mode
1
/usr/lib/jvm/java-6-openjdk-amd64/bin/javac 1061 manual mode
* 2
/usr/lib/jvm/java-7-openjdk-amd64/bin/javac 1051 manual mode
3
/usr/lib/jvm/jdk1.7.0_25/bin/javac 1 manual mode
You have to
Press enter to keep
the current choice[*], or type selection number. In here I will be
entering * since I need the 2nd option.
- For Javaws :
sudo update-alternatives --config javaws
This will output the following
There are 3 choices for the
alternative javaws (providing /usr/bin/javaws).
Selection Path
Priority Status
------------------------------------------------------------
0
/usr/lib/jvm/java-6-openjdk-amd64/jre/bin/javaws 1061 auto
mode
1
/usr/lib/jvm/java-6-openjdk-amd64/jre/bin/javaws 1061 manual
mode
* 2
/usr/lib/jvm/java-7-openjdk-amd64/jre/bin/javaws 1060 manual
mode
3
/usr/lib/jvm/jdk1.7.0_25/bin/javaws 1 manual
mode
You have to
Press enter to keep
the current choice[*], or type selection number. In here I will be
entering * since I need the 2nd option.
- Now you can check the java version
java -version
This will output the following if
the installation is successful :
java version "1.7.0_25"
OpenJDK Runtime Environment (IcedTea 2.3.10) (7u25-2.3.10-1ubuntu0.12.04.2)
OpenJDK 64-Bit Server VM (build 23.7-b01, mixed mode)
- Also you have to set JAVA_HOME in .bashrc.
Run the following command and open the .bashrc and give the correct path.
gedit ~/.bashrc
Add the following to the end of the file.
export JAVA_HOME=/usr/lib/jvm/java-1.7.0_25export PATH=$PATH:$JAVA_HOME/bin - Source the bash profile.
source ~/.bashrc
