How implemented Sun debugging?

Hi folks,
does anyone know how Sun implements debugging capabilities for their current Java Virtual Machines? I am just wondering if they use the Java Virtual Machine Tool Interface (JVMTI) or if they have other ways to inspect / control programs?
Cheers, riejo

There is an ASCII-art diagram of the debugging stack on this page:
http://java.sun.com/j2se/1.5.0/docs/guide/jpda/architecture.html
Hope this helps.

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