Oracle JDK 7 Installation in Debian Bookworm – Step-by-step

Installing

4. 4. Setting Up Oracle JDK 7

   Next Relocate Oracle JDK 7 Contents
   Login as the SuperUser:

   su -

   Authenticate with the User Admin Pass.
   If Got “User is Not in Sudoers file” then see: How to Enable sudo
   To Make a jvm Directory Only if Not already there
   (You can directly copy & paste the commands into the terminal)

   if [ ! -d "/usr/lib/jvm" ]; then mkdir /usr/lib/jvm; fi

   Set the root superUser as owner

   sudo chown -R root:root /tmp/jdk1.7*

   Then to shift the Oracle JDK 7 contents

   mv /tmp/jdk1.7* /usr/lib/jvm/
   

5. 5. Installing Oracle JDK 7

   Next to Install Oracle Java JDK 7.

   update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.7*/bin/java 1265
   

   update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.7*/bin/javac 1265
   

   update-alternatives --install /usr/bin/jar jar /usr/lib/jvm/jdk1.7*/bin/jar 1265
   

   update-alternatives --install /usr/bin/javaws javaws /usr/lib/jvm/jdk1.7*/bin/javaws 1265
   

   Checking or Setting the System Java Version in Use
   with

   update-alternatives --config java

   And for the Java Compiler instead:

   sudo update-alternatives --config javac

   To Switch of Java Version Just Enter the Selection Number on First, Column. :)
   Last Achieve the SuperUser session:

   exit