Tech tips: Getting Java working in Linux Mint 14 XFCE and Cinnamon for ProxMox and other apps

Linux Mint 14 XFCE and Cinnamon
The following are the Steps which I took to install Oracle Java 7, which I needed for ProxMox functionality, then reverting back to openJDK so other apps I have (don't work on Oracle Java 7) still work.

What I Actually Did

Followed the advice here: http://www.webupd8.org/2012/01/install-oracle-java-jdk-7-in-ubuntu-via.html

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java7-installer

This installed Java 7, but not all my java stuff works with Java 7 yet, so for now I switch back to the default Openjdk. This leaves the new functionality of java 7 needed for ProxMox intact, namely the embedded vncviewer functions. So after we are left with a mixed setup, but it works for now, and I can switch back and forth between java versions using the command given below.

switch back to the openjdk java

java -version

this verifies the oracle java 7 is installed (if not link to tutorial)

update-java-alternatives -l

this lists the installed alternatives
note the openjdk java listed

sudo update-java-alternatives -s [name of openjdk]

this switches back to primary java use of openjdk, but keeps links to Oracle Java 7 intact for functions not supported in openjdk
will show some errors because of the missing alternatives in openjdk

java -version

this should show the openjdk java

Various command options:

Check the java version installed

java -version

help on the update-java-alternatives

man update-java-alternatives

Remove the Oracle Java 7

sudo apt-get remove oracle-java7-installer

How this is setup on Linux Mint 14 XFCE and Cinnamon

update-java-alternatives: this is the program setup for
jinfo files: java info files are used to inform the update-java-alternatives program, which is the program that is used to change java alternatives

hidden file located in /usr/lib/jvm/ ... example /usr/lib/jvm/.java-1.7.0-openjdk-amd64.jinfo
contains information on where to access java sub-programs and plugins

Sim links from /usr/bin/[file] to /etc/alternatives/[file] for the following

java --> java
javaws --> javaws
jexec --> jexec
missing is a jar link that some help sites reference

Sim link from /etc/alternatives/[file] to /usr/lib/jvm/[dir/file] for the following (thus a link of a link is formed)

java --> java-7-openjdk-amd64/jre/bin/java
javaws --> java-7-openjdk-amd64/jre/bin/javaws
jexec --> java-7-openjdk-amd64/jre/lib/jexec
keytool --> java-7-openjdk-amd64/jre/bin/keytool
itweb-settings --> java-7-openjdk-amd64/jre/bin/itweb-settings
Plus the sim links for .1.gz files from and to same directories as above for the following