Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!eternal-september.org!feeder.eternal-september.org!mx05.eternal-september.org!.POSTED!not-for-mail
From: Eric Sosman <esosman@comcast-dot-net.invalid>
Newsgroups: comp.lang.java.programmer
Subject: Re: Setting a property for System.getProperty()
Date: Thu, 09 May 2013 11:33:23 -0400
Organization: A noiseless patient Spider
Lines: 36
Message-ID: <kmgfd9$p13$1@dont-email.me>
References: <38d76348-f691-439f-b476-50eeb2908c14@googlegroups.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Injection-Date: Thu, 9 May 2013 15:29:45 +0000 (UTC)
Injection-Info: mx05.eternal-september.org; posting-host="0d73d8cc209bff1c6395088b400d0605"; logging-data="25635"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX186huf02gsFhro9HQcZl356"
User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:17.0) Gecko/20130328 Thunderbird/17.0.5
In-Reply-To: <38d76348-f691-439f-b476-50eeb2908c14@googlegroups.com>
Cancel-Lock: sha1:b+XZSbn84gJzxpnnPRGWLEhaHHk=
Xref: csiph.com comp.lang.java.programmer:23964

On 5/9/2013 10:53 AM, RVic wrote:
> I inherited someones mountain of code wherein they use different idioms and ways of doing things than I typically do.
>
> In one instance, there is a line of code:
>
> System.getProperty("cn.env");
>
> which, depending on what machine it is run on, has properties like "production" or "mirror"
>
> Yet, I think this call, System.getProperty(), calls properties from the actual system, like (System.getProperty("user.home") or System.getProperty("file.separator").
>
> So how can I set this on a particular machine (Ubuntu 12 in this case) for a value for cn.env?

     java -Dcn.env=ZaphodBeeblebrox MyClass

... is one way.  See also System.setProperty(), which you could
use in a "launcher" class like

	public class Launcher {
	    public static void main(String[] args) {
	        // Get a value -- this takes one from the
	        // environment, but you could get as fancy
	        // as you like here.
	        String value = System.getenv("CN_ENV");

	        // Set the property.
	        System.setProperty("cn.env", value);

	        // Run the "real" main() method.
	        MyClass.main(args);
	    }
	}

-- 
Eric Sosman
esosman@comcast-dot-net.invalid