Select the Application Server component and the JVM Settings tab in the Admin Console.
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.
To add JPDA options, add any desired JPDA debugging options in Debug Options. See JPDA Options.
For details, click the Help button in the Admin Console from the JVM Settings page.