Scope of the Java System Properties

Question

In Java we use System.setProperty() method to set some system properties. According to this article the use of system properties is bit tricky.

System

Answer 1

There is one copy of the properties per VM. They have much the same problems as other statics (including singletons).

I guess, as a hack, you call System.setProperties to a version of Properties that responds differently depending on the context (thread, call stack, time of day, etc.). It could also log any changes with System.setProperty. You could also set a SecurityManager logs security checks for the relevant permissions.