Here is some code to print out all of the system properties on stdout:

TreeMap mvProp = new TreeMap(System.getProperties());
 System.out.println("\nThe system properties:");
 for (java.util.Iterator iter = mvProp.keySet().iterator(); iter
 .hasNext();) {
 String strName = (String) iter.next();
 System.out.println("\t" + strName + "=" + mvProp.get(strName));
 }

Also, look at the example code (system info servlet) I provided to the Southern California JBoss Users Group: http://www.oclajbug.com/index.php?name=Downloads&req=viewdownload&cid=3