Re: Setting a property for System.getProperty()

Eric Sosman <esosman@comcast-dot-net.invalid>
Thu, 09 May 2013 11:33:23 -0400
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:


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.

Eric Sosman

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