Thursday, 24 March 2016

Install Java SE SDK


This post will outline the steps required to install Java in Kali Linux 2.0 – Kali Sana. This post got the same instructions which also applies to Kali Linux 1.x and it’s still valid. I’ve had other readers confirming the process. Do verify and if it worked for you, let me know via comments section. I’ve also updated instructions for latest Java SE Development Kit 7u79 i.e. jdk-7u79-linux-x64.tar.gz, so you can pretty much copy paste it as long the versions are matching. Otherwise, replace the version number and you will be fine.

So lets get on with the installation:
Download latest Java SE SDK

Note that I’m using x64 which is 64-bit. 32-bit users should choose their versions accordingly. Not that tough really!

Download and save the file in /root directory.
Uncompress archive
Now you uncompress and move the whole uncompressed folder to/opt (optional) directory.

tar -xzvf /root/jdk-7u79-linux-x64.tar.gz
mv jdk1.7.0_79 /opt
cd /opt/jdk1.7.0_79

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_79/bin/java 1
update-alternatives --install /usr/bin/javac javac /opt/jdk1.7.0_79/bin/javac 1
update-alternatives --install /usr/lib/mozilla/plugins/libjavaplugin.so mozilla-javaplugin.so /opt/jdk1.7.0_79/jre/lib/amd64/libnpjp2.so 1
update-alternatives --set java /opt/jdk1.7.0_79/bin/java
update-alternatives --set javac /opt/jdk1.7.0_79/bin/javac
update-alternatives --set mozilla-javaplugin.so /opt/jdk1.7.0_79/jre/lib/amd64/libnpjp2.so

Testing your installation

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-editor.
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.

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