Replace "this" in *Impl-classes by "self()"?

Hello,  
  
the userguide says every "this"-keyword in the *Impl-classes needs to be 
replaced by the "self()"-method. 
 
I tried that but javac complains because it doesn't know a self-method. 
Is it a wrong or old information in the userguide? 
 
thanks 
ronny 
 

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