Reflection type inference on Java 8 Lambdas

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The exact decision how to map lambda code to interface implementations is left to the actual runtime environment. In principle, all lambdas implementing the same raw interface could share a single runtime class just like MethodHandleProxies does. Using different classes for specific lambdas is an optimization performed by the actual LambdaMetafactory implementation but not a feature intended to aid debugging or Reflection.

So even if you find more detailed information in the actual runtime class of a lambda interface implementation it will be an artifact of the currently used runtime environment which might not be available in different implementation or even other versions of your current environment.

If the lambda is Serializable you can use the fact that the serialized form contains the method signature of the instantiated interface type to puzzle the actual type variable values together.

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