Re: detecting which jvm version is being ran?

From:

"Andrew Thompson" <andrewthommo@gmail.com>

Newsgroups:

comp.lang.java.programmer

Date:

20 Nov 2006 13:56:44 -0800

Message-ID:

<1164059803.942605.157540@m7g2000cwm.googlegroups.com>

yawnmoth wrote:

saotome wrote:

Make a call to System.getProperties(). That will return a properties
object that contains information about your environment. The
'java.version' key will return a value with what you are looking for.
This also has other information that may be useful for your needs. For
further information check out:
http://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.html#getProperties()

This doesn't seem to be possible when done via applets?

Sure it is, if the applet is signed and trusted.

Finding all the properties that are defined could
be a security risk, so an untrusted applet will only
ever allow certain information to be obtained,
and will not give the 'full list' of properties defined.

I say that because when I tried to run it via an applet, I got this
error message:

exception: java.security.AccessControlException: access denied
(java.util.PropertyPermission * read,write).

Try calling for each property of interest separately,
in this case..
System.getProperty("java.version");

Note it might be handy to run the 'getProperties()'
from the command line to find out the typical property
names.

Andrew T.