How to detect if a Java System property has changed?

I would like to know when a System property is changed. I have an application, in an application server, that somehow is changing a system property (`System.setProperty()` I think). I was taking a look and I have found different approaches: 1. [JPDA?][1] 2. [Observer & Observable?][2] 3. [Property change listener?][3] 4. [JMX?][4] Any suggestions? Thanks in advance. [1]: https://stackoverflow.com/questions/5410054/attach-to-another-jvm-and-listen-for-events-possible [2]: https://stackoverflow.com/questions/4130673/triggering-events-in-java-when-an-objects-state-changes [3]: http://docs.oracle.com/javase/tutorial/uiswing/events/propertychangelistener.html [4]: http://java.sun.com/developer/technicalArticles/J2SE/jmx.html

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