Question

I have standalone Java application ,in that i have various modules
Application starts from one classes main() method and then application goes on.

Now i wanted share variables in form of key/value pair to various modules

How can i do it ?

Update :

From main() which kicks on application , from there i will be setting some variables.
and also from here it starts some modules programs ,

I just want similar functionality like ServletContext , SessionContext variables , just like in Servlet container

Answer 1

If you’re looking for JVM wide simple string based key/value configuration storage then the system properties are usually a good fit: http://docs.oracle.com/javase/tutorial/essential/environment/sysprop.html

Anywhere in your code you can use:

String configThingValue = System.getProperty("config-thing");

System.setProperty("config-thing", "config thing value");

Also, System.getProperties() provides a map like set of properties (it extends Hashtable).