Jtdcftul

1. 
   

   Remove all the Java related packages (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 (careful. This command removed libsgutils2-2 and virtualbox config files too):

   
   
   

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

   
   


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, 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
   
   

   
   


6. 
   

   Search for possible remaining Java directories:

   
   
   

   sudo updatedb
   
   sudo locate -b 'pack200'
   
   

   
   
   

   If the command above produces any output like /path/to/jre1.6.0_34/bin/pack200 remove the directory that is parent of bin, like this: sudo rm -rf /path/to/jre1.6.0_34.

   
   

To completely remove OpenJDK on Ubuntu 11.10 (this may or may not be sufficient on other versions of Ubuntu), run:

sudo apt-get purge openjdk-* icedtea-* icedtea6-*

If you want instructions for removing the proprietary Oracle ("Sun") version of Java, then you'll have to specify how you installed it. (If you edit your question to indicate this and leave a comment to this answer, I'll try to add information about how to remove that too.)

You may not need to completely remove the OpenJDK to resolve your problem. Install the sun-java6 packages. Then use update-java-alternatives to switch to the Sun java packages.

If you do want to completely remove OpenJDK remove the default-jdk and/or default-jre packages. You may need to remove some java packages but most of them should be happy once you have the Sun JDK packages installed.

You may want to follow one of these cleanup tips once you are done removing packages.

To uninstall Oracle Java 7, just press
Ctrl+Alt+T on your keyboard to open
Terminal. When it opens, run the command below.

sudo update-alternatives --display java

To check the setup before uninstalling Java.

Next, remove symlinks

(replace the word (version)with your Java version. DO java -version to get yours. So if your version is 1.7.0_03, you would type sudo update-alternatives --remove "java" "/usr/lib/jvm/jdk1.7.0_03/bin/java")

sudo update-alternatives --remove "java" "/usr/lib/jvm/jdk<version>/bin/java"

sudo update-alternatives --remove "javac" "/usr/lib/jvm/jdk<version>/bin/javac"

sudo update-alternatives --remove "javaws" "/usr/lib/jvm/jdk<version>/bin/javaws"

verify that the symlinks were removed

java -version

javac -version

which javaws

The next 2 commands must be type excatly perfectly to avoid
permanently destroying your system.

cd /usr/lib/jvm

sudo rm -rf jdk<version>

Then do

sudo update-alternatives --config java

sudo update-alternatives --config javac

sudo update-alternatives --config javaws

Then do

sudo vi  /etc/environment

Delete the line with JAVA_HOME ¹

To uninstall OpenJDK (if installed). First check which OpenJDK packages are installed.

sudo dpkg --list | grep -i jdk

To remove openjdk:

sudo apt-get purge openjdk*

Uninstall OpenJDK related packages.

sudo apt-get purge icedtea-* openjdk-*

Check that all OpenJDK packages have been removed.

sudo dpkg --list | grep -i jdk

^{1Source:akbarahmed.com}

Try this command:

java -version

If 1.6* comes then try:

sudo apt-get autoremove openjdk-6-jre

If 1.7* comes then try:

sudo apt-get autoremove openjdk-7-jre

Assuming that you don't have jdk in your system. If you have use this command:

sudo apt-get autoremove openjdk-`<version>`-jdk

replace with the version like we did it in previous example.