How to Install Java JDK in Linux

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This is a small guide with instructions that users can copy paste and make Java work in their Kali Linux. Thanks to purehate for providing original instructions. I’ve modified his instruction to suit my needs and I hope this will benefit users as well.
So lets get on with this guide…
Contents [hide]
  • How to Install Java JDK in Kali Linux
  • Instructions on How to Install Java JDK in Kali Linux:
  • Download the latest Java SE SDK version
  • UnTar the Archive and move to/opt
  • Install and register binaries
  • Test
  • Google+
  • Related


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    Instructions on How to Install Java JDK in Kali Linux:
     
    Download the latest Java SE SDK version
    Go to the following link and download jdk7. At the time of writing this guide the jdk version was jdk-7u45-linux-x64. Note that I’m using x64 which is 64-bit. 32-bit users should choose their versions accordingly. Not that tough really!
    Following is what I’ve used. 
    JDK-7u45-Linux-x64
    Again, at the time of writing this guide the available version was jdk-7u45-linux-x64.tar.gz
    Download and save the file in/root directory.
     
    UnTar the Archive and move to/opt
    tar -xzvf /root/jdk-7u45-linux-x64.tar.gz
    mv jdk1.7.0_45 /opt
    cd /opt/jdk1.7.0_45

     
    Install and register binaries
    This step registers the downloaded version of Java as an alternative, and switches it to be used as the default:
    update-alternatives --install /usr/bin/java java /opt/jdk1.7.0_45/bin/java 1
    update-alternatives --install /usr/bin/javac javac /opt/jdk1.7.0_45/bin/javac 1
    update-alternatives --install /usr/lib/mozilla/plugins/libjavaplugin.so mozilla-javaplugin.so /opt/jdk1.7.0_45/jre/lib/amd64/libnpjp2.so 1
    update-alternatives --set java /opt/jdk1.7.0_45/bin/java
    update-alternatives --set javac /opt/jdk1.7.0_45/bin/javac
    update-alternatives --set mozilla-javaplugin.so /opt/jdk1.7.0_45/jre/lib/amd64/libnpjp2.so

     
    Test
    First of all, close your browser and re-open. You won’t believe how many users actually forgets to do this step and later complains Java ain’t working. I’d advise to bookmark this site to be able to reopen these instructions quickly, or simply copy these into a leafpad/vi/text file.
    To check the version of Java you are now running
    java -version

    To check the browser plugin just click Do I have Java?
    This should take you to Oracles Java website and you will see a confirmation message.
    After Java the next step is obviously installing Flash. No one want’s to miss Youtube cat videos! Well, maybe not everyone. Here’s the guide to enable Flash in Kali Linux How to Install Flash in Kali Linux.
    Come from : http://www.blackmoreops.com/2013/10/26/how-to-install-java-jdk-in-kali-linux/