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Gives error for unused parameter of a protected method in base class, if Set the "Parameter Never Read" as error in Windows->preferences. But the parameter is used in derived classes. So it should not give error for unused parameters for protected method.
This is a known limitation of this diagnosis. If it had to check for possible subclasses, it would get way to slow (you need to search for subclasses...). In the future, we want to use the annotation support from 1.5, to allow people to tag such "unused" parameters so as not to get the warning.
Will reconsider post 3.0
JDT/Summit topic
dup *** This bug has been marked as a duplicate of bug 118217 ***
Verify for 3.3M7 with I20070503-1400.