Groups > comp.lang.java.programmer > #23964

Re: Setting a property for System.getProperty()

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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
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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

Thread

Setting a property for System.getProperty() RVic <rvince99@hotmail.com> - 2013-05-09 07:53 -0700
  Re: Setting a property for System.getProperty() lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-05-09 16:22 +0100
  Re: Setting a property for System.getProperty() Eric Sosman <esosman@comcast-dot-net.invalid> - 2013-05-09 11:33 -0400
  Re: Setting a property for System.getProperty() RVic <rvince99@hotmail.com> - 2013-05-09 09:01 -0700
    Re: Setting a property for System.getProperty() Arne Vajhøj <arne@vajhoej.dk> - 2013-05-09 21:51 -0400
  Re: Setting a property for System.getProperty() RVic <rvince99@hotmail.com> - 2013-05-09 09:14 -0700
    Re: Setting a property for System.getProperty() markspace <markspace@nospam.nospam> - 2013-05-09 09:48 -0700
      Re: Setting a property for System.getProperty() Arne Vajhøj <arne@vajhoej.dk> - 2013-05-09 21:57 -0400

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