Reference: https://www.digitalocean.com/community/tutorials/how-to-manually-install-oracle-java-on-a-debian-or-ubuntu-vps

Note: This particular post is purely for my notes. So, I suggest you to visit the reference site 🙂

Java jdk installation

• Choose the jdk version from here

  I have chosen jdk7 from here

• Accept the License and Download:

  # wget --no-check-certificate --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/7u72-b14/jdk-7u72-linux-i586.tar.gz
  

  (OR) Download the tar file manually from here

• Install:

  
  # mkdir /usr/java
  # tar -xvzf jdk-7u72-linux-i586.tar.gz -C /usr/java/
  

• Setting Oracle JDK as the default JVM

  
  # update-alternatives --install /usr/bin/java java /usr/java/jdk1.7.0_72/bin/java 100
  # update-alternatives --install /usr/bin/javac javac /usr/java/jdk1.7.0_72/bin/javac 100
  # update-alternatives --install /usr/bin/javaws javaws /usr/java/jdk1.7.0_72/bin/javaws 100
  

• Verify that java has been successfully configured by running:

  
  # update-alternatives --display java
  # update-alternatives --display javac
  # update-alternatives --display javaws
  

• Check installation:

  # java -version

• Set the JAVA_HOME for all the users

  #vim /etc/profile
  JAVA_HOME=/usr/java/jdk1.7.0_72
  export PATH=$PATH:$JAVA_HOME/bin
  
  #source /etc/profile
  

• Check JAVA_HOME for all the users

  
  #echo $JAVA_HOME
  Output: /usr/java/jdk1.7.0_72
  

Java jdk uninstall

• Remove the link:

  
  #update-alternatives --remove "java" "/usr/java/jdk1.7.0_72/bin/java"    
  #update-alternatives --remove "javac" "/usr/java/jdk1.7.0_72/bin/javac"    
  #update-alternatives --remove "javaws" "/usr/java/jdk1.7.0_72/bin/javaws"
  

• Remove the java package

  
  #rm -rf /usr/java/jdk1.7.0_72