Final arguments in interface methods – what’s the point?

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It doesn’t seem like there’s any point to it. According to the Java Language Specification 4.12.4:

Declaring a variable final can serve
as useful documentation that its value
will not change and can help avoid
programming errors.

However, a final modifier on a method parameter is not mentioned in the rules for matching signatures of overridden methods, and it has no effect on the caller, only within the body of an implementation. Also, as noted by Robin in a comment, the final modifier on a method parameter has no effect on the generated byte code. (This is not true for other uses of final.)

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