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dev build of 4.1 from Feb 7, JDK 5.0u1 there is a refactoring called change method signature but it does not allow me to remove existing method parameter.
It does allow you to remove the parameter. But only if it is not used. This is as designed - if we allow to remove used parameters, we would not know how to refactor the code to make it compilable. People would then file issues that the refactoring breaks their code. We can consider this as an enhancement request (probably if we display a warning that a given parameter is used, removal could be fine).
Now I see.
Warning was added in: 46114:0fc688ea33f5 - Jun 12, 2007
*** Bug 53146 has been marked as a duplicate of this bug. ***