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In this blog post I am going to show you how to downgrade java and javac on ubuntu/kali linux. Some applications will require older version of java; For instance, I had to downgrade from openjdk 10 to openjdk 8 because Jenkins doesn’t support openjdk 10.

The availability of java versions depends on your repository source list (/etc/apt/source.list). Use the command below to search for available jdks and then select one from them,

sudo apt-cache search jdk

In my case I will choose jdk8, so let me install jdk8 using the commands below.

sudo apt-get update 
sudo apt-get install openjdk-8-jdk

This will install java jdk8, but we need to make a selection for default version of java among the existing versions i.e; between jdk10 & jdk8. To change this preference use the command below and make a selection.

sudo update-alternatives --config javac

This will update for javac, the java compiler. Now, let’s do the same for java

sudo update-alternatives --config java

Now, let’s check the java & javac versions.

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