How to keep the parameter types of lambdas?

This is a odd Java reflection issue, that happens because of type erasure:

<P, R> void printIt(Function<P, R> function) {
        inner(function);
    }

    private void inner(Object function) {
        for (Method method : function.getClass().getDeclaredMethods()) {
            System.out.println(method);
        }
    }

    @Test
    public void testAnyHandler() {
        printIt((String a) -> "Hello");
    }

the result is:

public java.lang.Object com.dariodario.sqlsmile.QueryTest$$Lambda$1/1607460018.apply(java.lang.Object)

which is really a shame... Is there any way to keep the parameters?