Re: Setting a property for System.getProperty()

From:

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

Newsgroups:

comp.lang.java.programmer

Date:

Thu, 09 May 2013 11:33:23 -0400

Message-ID:

<kmgfd9$p13$1@dont-email.me>

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