How to completely uninstall Java?

1) Remove all the Java related packages

sudo apt-get update

(Sun, Oracle, OpenJDK, IcedTea plugins, GIJ):

dpkg-query -W -f='${binary:Package}\n' | grep -E -e '^(ia32-)?(sun|oracle)-java' -e '^openjdk-' -e '^icedtea' -e '^(default|gcj)-j(re|dk)' -e '^gcj-(.*)-j(re|dk)' -e '

^java-common' | xargs sudo apt-get -y remove

 sudo apt-get -y autoremove

2) Purge config files

After removing all the packages you need to purge all the config files. For that run the following command:

dpkg -l | grep

 ^rc | awk '{print($2)}' | xargs sudo apt-get -y purge

Remove cache directory

3) Remove Java config and cache directory

:

sudo bash -c 'ls -d /home/*/.java' | xargs sudo rm -rf

4) Remove manually installed

JVMs:

sudo rm -rf /usr/lib/jvm/*

5) Remove

Java entries

After uninstalling all the java components from your system some java entries might still be left in your system. To get rid of them run the following command, if there is still any, from the alternatives:

Remove java directories from system

This is the final step in removing Java from your system. After uninstalling the java packages the java directories might still be there in your system. To remove them you need to first find if there are any left. Use the following commands to find any leftover directories:

If after running the above script you get any output similar to 'jre1.5/bin/pack200' then run the following command (replace jre1.5 with the directory name that you got in the output at the terminal) to remove the leftover java directory:

for g in ControlPanel java java_vm javaws jcontrol jexec keytool mozilla-javaplugin.so orbd pack200 policytool rmid rmiregistry servertool tnameserv unpack200 appletviewer apt extcheck HtmlConverter idlj jar jarsigner javac javadoc javah javap jconsole jdb jhat jinfo jmap jps jrunscript jsadebugd jstack jstat jstatd native2ascii rmic schemagen serialver wsgen wsimport xjc xulrunner-1.9-javaplugin.so; do sudo update-alternatives --remove-all $g;

 done

6) Search for possible remaining Java directories:

sudo updatedb sudo locate -b '\pack200'

dpkg-query -W -f='${binary:Package}\n' | grep -E -e '^(ia32-)?(sun|oracle)-java' -e '^openjdk-' -e '^icedtea' -e '^(default|gcj)-j(re|dk)' -e '^gcj-(.*)-j(re|dk)' -e '^java-common' | xargs sudo apt-get -y remove sudo apt-get -y autoremove