asadmin start-domain --debug [domain-name]
You can then attach to the server from the debugger at its default JPDA port, which is 9009. For example, for UNIX systems:
jdb -attach 9009
jdb -connect com.sun.jdi.SocketAttach:port=9009
Application Server debugging is based on the JPDA (Java Platform Debugger Architecture). For more information, see JPDA Options.
You can enable debugging even when the application server is started without the --debug option. This is useful if you start the application server from the Windows Start Menu or if you want to make sure that debugging is always turned on.
Check the Debug Enabled box.
To specify a different port (from 9009, the default) to use when attaching the JVM to a debugger, specify address= port-number in the Debug Options field.
If you wish to add JPDA options, add any desired JPDA debugging options in Debug Options. See JPDA Options .
For details, see the Sun Java System Application Server Platform Edition 8.2 Administration Guide.