Which Tool to tgenerate enahanced JavaDoc with class digram?

[Palthepu, Srinivas]

Hi

This is not just Netty question, but I found that Netty project uses a tool that generates nice java docs augmented with class diagrams.
I would like to know which tool that Netty/Trustin uses for this purpose and if it is available for others like us to use it.

Thanks for the help
Srini

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