When you enable debugging, you enable both local and remote debugging. To start the server in debug mode, use the ----debug option as follows:
asadmin start-domain --debug [domain-name]
jdb -attach 9009
jdb -connect com.sun.jdi.SocketAttach:port=9009
For more information about the jdb debugger, see the following links:
Java Platform Debugger Architecture - The Java Debugger: http://java.sun.com/javase/technologies/core/toolsapis/jpda/
Java Platform Debugger Architecture - Connecting with JDB: http://java.sun.com/javase/technologies/core/toolsapis/jpda/
GlassFish Server debugging is based on the JPDA. For more information, see JPDA Options.
You can attach to the GlassFish Server using any JPDA compliant debugger, including that of NetBeans, Java Studio Enterprise, JBuilder, Eclipse, and so on.
You can enable debugging even when the GlassFish Server is started without the ----debug option. This is useful if you start the GlassFish Server from the Windows Start Menu, or if you want to make sure that debugging is always turned on.
For details, click the Help button in the Administration Console from the JVM Settings page.