Installed JBoss 4.0.3RC1 from the graphical installer using the EJB3 configuration.

I go to:
http://localhost:8080/jmx-console/HtmlAdaptor?action=inspectMBean&name=jboss%3Aservice%3DHypersonic%2Cdatabase%3DlocalDB

Invoke: startDatabaseManager()

Error:
23:17:36,631 ERROR [HypersonicDatabase] Failed to start database manager
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.jboss.jdbc.HypersonicDatabase$1.run(HypersonicDatabase.java:556)
Caused by: java.awt.HeadlessException
at java.applet.Applet.<init>(Applet.java:44)
at javax.swing.JApplet.<init>(JApplet.java:101)
at org.hsqldb.util.DatabaseManagerSwing.<init>(Unknown Source)
at org.hsqldb.util.DatabaseManagerSwing.main(Unknown Source)
... 5 more