paulk-asert opened a new pull request, #2697:
URL: https://github.com/apache/groovy/pull/2697
… a reference type
A @CompileStatic lambda declaring a primitive parameter (e.g. (int a) ->
...) against a generic functional interface (e.g. Function<Integer,Integer>)
compiled cleanly but threw at runtime:
java.lang.invoke.LambdaConversionException:
int is not a subtype of class java.lang.Object
AbstractFunctionalInterfaceWriter.convertParameterType always emitted a
primitive implementation-method parameter when the lambda declared a primitive,
ignoring the target (functional-interface) parameter type. But
LambdaMetafactory links against the erased SAM signature (Object) and will not
unbox to a primitive, so the implementation method must accept the boxed type
when the SAM parameter is a reference type. It stays primitive only when the
SAM parameter is itself primitive (e.g. IntUnaryOperator), preserving
GROOVY-9790.
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