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From: markspace <-@.>
Newsgroups: comp.lang.java.programmer
Subject: Re: How to find out if I use java.exe from a jdk, a jre or a javaEE installation?
Date: Fri, 12 Aug 2011 08:20:54 -0700
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On 8/12/2011 7:33 AM, Robin Wenger wrote:
> How can I find out (in Win) WHICH java.exe I used in detail?

It's "where java" on windows, and I think whereis on *nix.

If you mean programatically, just access the class/sdk component or 
other service.  If you get an exception, it wasn't installed.  Some 
programs (like ant) require you to set the JAVA_HOME environment 
variable to identify which SDK you want to use (some users have more 
than one).  I prefer using command line arguments or cofig files; 
polluting the environment with lots of tedious variables is a last resort.