Java: Modifying System Properties for a Java App

Question

Hi, I am using a Java JMS GUI utility (HermesJMS), and in its runtime, I need to invoke:

System.setProperty("user.name", "s24park");

Is there a properties file within JDK(1.6.0.18) that stores system properties?

Answer 1

You can use -D flag when launching your application.

java -Duser.name=s24park YourClass

See this post for more information. There is no file for System properties.

Answer 2

An interesting link I had come upon recently:

http://leepoint.net/notes-java/io/30properties_and_preferences/40sysprops/10sysprop.html

You can also use the Properties class - but this has nothing to do with "system" properties. Any properties can be saved and loaded via this class

Answer 3

It is possible that your JVM may have one or more configuration files in which it is possible to create permanent system properties. That said, you really should be using java.util.prefs.Preferences.