How to change Java properties at runtime?

Question

The question: Is there some way to \"connect\" to a running JVM and change system properties (given by -Dproperty=value) without stopping the JVM and without having programmed a

Answer 1

Not a long-term solution, but you could connect a debugger and hot-swap some code that returns the property value you want instead of looking up the property. This requires that you enabled remote debugging when you started JBoss though.

Answer 2

Example found in one of my code:

System.setProperty("javax.net.ssl.trustStore", keystore_file); 

You can run it in response for "reconfigure" query (add reconfigure() to your server code).

Answer 3

As others have already suggested, probably can't change the system property value used by your application. One option might be restarting your application. It seems that Jboss offers JMX enabled stop/start ability for web applications which you can read here though I haven't actually tried it out.

Answer 4

Many system properties are only examined on start up so changing them doesn't always help.

I suggest you add support within your application to perform the change via a request so your application will know that it has happened and handle it accordingly.

Answer 5

you can do it using System.setProperty() method. for example: System.setProperty(key, value);