JDK-8068903 : Can't invoke vararg @FunctionalInterface methods
  • Type: Enhancement
  • Component: core-libs
  • Sub-Component: jdk.nashorn
  • Affected Version: 9
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • OS: generic
  • CPU: generic
  • Submitted: 2015-01-13
  • Updated: 2016-01-14
  • Resolved: 2015-09-01
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8u72Fixed 9 b81Fixed
Related Reports
Relates :  
Given this test interface:

package jdk.nashorn.test.models;

public interface VarArgConsumer {
    public void apply(Object... o);

This won't work:

var c = new (Java.type("jdk.nashorn.test.models.VarArgConsumer"))(
    function() { print(arguments.length) });
c(1, 2, 3)

A solution would be to rely on Dynalink's DynamicMethod instead of reflective Method.
Yes, this is an issue. But the function can't use arguments to access args passed - because it is passed as Java Object[]. That is the case when explicitly calling "apply" method (as an interface method) as well. i.e., that part has to be (if we want..) handled as Java adapter change. For the current issue, we just need to make sure the object can be invoked as a function even if it has vararg SAM.

Using DynamicMethod would likely also (since they're specific to the exact receiver class) solve JDK-8068901.