Where do we need to pass the value for System.getProperty in Eclipse

Question

I have imported an existing Java EE application into my Eclipse IDE.

I found this piece of code under it

public static String decideEnv() {
        String env = null;
        env = (String) System.getProperties().get("TB_ENVIRONEMNT");
            return env;
    }

could anybody please let me know from where exactly it gets the value with this line

System.getProperties().get("TB_ENVIRONEMNT")

Do we need to set this value anywhere ??

Answer 1

Go to Run/Run Configurations, locate your run configuration (I guess you are using applicaiton server), choose it and add -DTB_ENVIRONEMNT=your value here to Arguments tab, text area "VM arguments"

Answer 2

There can be multiple ways to set the system properties, following ways are common

1. search in your code if it sets programatically (do file search )
2. When it loads the app to server, we can pass the system properties there too
3. Also see in your native OS's system properties