Removing old versions of the JDK

Hi,

Over time I have been updating the Java VM on my Mac with the latest releases, 
but just today I realized that in /Library/Java/JavaVirtualMachines there are 
actually a few JVMs installed:

drwxr-xr-x 3 root wheel 102 Jun 29 2011 1.6.0_26-b03-383.jdk
drwxr-xr-x 3 root wheel 102 Nov 1 18:45 1.6.0_29-b11-402.jdk
drwxr-xr-x 3 root wheel 102 Mar 28 02:55 1.6.0_31-b04-413.jdk
drwxrwxr-x 3 root wheel 102 Mar 16 02:15 1.7.0.jdk
drwxr-xr-x@ 4 root wheel 136 Jan 20 03:33 JDK 1.7.0 Developer Preview.jdk

All these JVMs are registered in the Java preferences app, actually the old 
(vulnerable) versions were still active and had a higher priority than the 
newer versions. This surprised me a bit.

I have some questions about this…..

- is it correct that the JVM installers do not remove older and insecure 
versions of the VM ?
- in the Java preference panel: after installing a new version, why hasn't a 
newer version a higher "priority"?
- can I just remove the older versions of the VM?
- would it a good idea to have older versions removed automatically?

cheers

Dannes




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