Remove all Java

• Remove all the Java related packages

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

• Purge config files

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

• Remove Java config and cache directory

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

• Remove manually installed JVMs

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

• Remove Java entries, if there is still any, from the alternatives

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