incorrect "reference ... is ambiguous" when overriding method in several classes

having the following classes hierarchy:

  RR <- HH

  S <- HS <- AS <- AAS

and following methods:

  S.service(RR) { }

  HS.service(RR) { this.service(HH) }

  HS.service(HH) { }

  AS.service(RR) { super.service(RR) }

  AAS.service(HH) { super.service(HH) }

gives a "Reference to service is ambiguous. It is defined in void service(RR) and void service(HH)." compile error.

it shouldn't.

using the fastjavac compiler from javaworkshop 3.0 compiles fine.

after compiled, can be run by any VM.