Currently, when the classfiles do not contain parameter names (neither in debug info nor in the MethodParameters attribute), the VariableElement.getSimpleName() returns a synthesized name for the parameter. The creator of the JavacTask might be able to infer a better name for the parameter, using a possibly relatively slow approaches.

The proposal here is to allow the creator of the JavacTask to supply a provider for parameter names, that would be used on demand when the name would be requested using VariableElement.getSimpleName().