import java.lang.invoke.*;
import java.util.Arrays;

interface MyFunctionalInterfaceVarargs {
    Object invokeMethodReference(Object... args) throws Throwable;
}

interface MyFunctionalInterfaceArity3 {
    Object invokeMethodReference(Object a, Object b, Object c) throws Throwable;
}

public class Test {
    public Object m(Object ... args) {
        System.out.println("m: " + Arrays.toString(args));
        return "m";
    }
    public static void main(String argv[]) throws Throwable {
        MethodHandles.Lookup lookup = MethodHandles.lookup();
        MethodType mt = MethodType.methodType(String.class, char.class, char.class);
        MethodHandle ms = lookup.findVirtual(String.class, "replace", mt);

        System.out.println("result: " + ms.invoke("some string to search", 's', 'o'));

        MyFunctionalInterfaceVarargs methodRefSimple = new Test()::m;

        methodRefSimple.invokeMethodReference("first", "second");

        Object res;

        MyFunctionalInterfaceVarargs methodRefSignPoly = ms::invoke;
        try {
            res = methodRefSignPoly.invokeMethodReference("some string to search", 's', 'o');
        } catch (Throwable ex) {
            res = ex;
        }
        assert(res instanceof WrongMethodTypeException);
        System.out.println(res);
        // WrongMethodTypeException: cannot convert MethodHandle(String,char,char)String to (Object[])Object

        MyFunctionalInterfaceArity3 methodRefSignPolyArity3 = ms::invoke;
        res = methodRefSignPolyArity3.invokeMethodReference("some string to search", 's', 'o');
        assert(res.equals("oome otring to oearch"));
        System.out.println(res);
    }
}
/*
result: oome otring to oearch
m: [first, second]
java.lang.invoke.WrongMethodTypeException: cannot convert MethodHandle(String,char,char)String to (Object[])Object
Exception in thread "main" java.lang.BootstrapMethodError: call site initialization exception
	at java.lang.invoke.CallSite.makeSite(CallSite.java:328)
	at java.lang.invoke.MethodHandleNatives.linkCallSite(MethodHandleNatives.java:296)
	at Test.main(Test.java:40)
Caused by: java.lang.invoke.LambdaConversionException: Incorrect number of parameters for instance method invokeVirtual java.lang.invoke.MethodHandle.invoke:(Object[])Object; 1 captured parameters, 3 functional interface method parameters, 1 implementation parameters
	at java.lang.invoke.AbstractValidatingLambdaMetafactory.validateMetafactoryArgs(AbstractValidatingLambdaMetafactory.java:188)
	at java.lang.invoke.LambdaMetafactory.metafactory(LambdaMetafactory.java:303)
	at java.lang.invoke.CallSite.makeSite(CallSite.java:289)
	... 2 more
*/