Default methods: Possible problem with JDWP sendMethod resolution semantics

[Jaroslav Bachorik]

Hi,

I think this is related to 
https://bugs.openjdk.java.net/browse/JDK-8031195 
(com.sun.jdi.InterfaceType.invokeMethod() is missing)

-JB-

On 28.1.2014 07:06, David Holmes wrote:
> Hi Jesper,
>
> This seems more of an issue with the hotspot runtime so cc'd hotspot-dev.
>
> David
>
> On 27/01/2014 11:37 PM, Jesper Steen Møller wrote:
>> Hi list
>>
>> I realize that this is possibly not the right list, but I'm having a
>> lambda-related problem with the JDWP protocol (from the Eclipse Java
>> Debugger)
>> The problem is that I cannot invoke the default method of an interface
>> using the equivalent of the superclass invocation syntax. Consider
>> this example:
>>
>> public interface A {
>>     default int getOne() {
>>         return 1;
>>     }
>> }
>>
>> public interface B {
>>     default int getOne() {
>>         return 2;
>>     }
>> }
>>
>> public class Impl implements A, B {
>>     public int getOne() {
>>         return B.super.getOne() + 3; // stop here and inspect
>> B.super.getOne()
>>     }
>>     public static void main(String[] args) {
>>         Impl i = new Impl();
>>         System.out.println(i.getOne());
>>     }
>> }
>>
>> Now, consider the line with the comment "stop here ...". Assume I have
>> a suspended thread on that line, and I wish to inspect
>> "B.super.getOne()", i.e. invoke the method B.getOne, using the 'this'
>> reference as the receiver. So, I'm sending a "Invoke Method" command
>> under the ObjectReference Command Set, like this:
>>
>> object     -  objectID of 'this'
>> thread       - threadID of suspended thread
>> clazz         - classID of 'B'
>> method     - methodID of 'B.getOne'
>> arguments - 0
>> option      - 3 (this INVOKE_SINGLE_THREADED +
>> INVOKE_NONVIRTUALINVOKE_NONVIRTUAL)
>>
>> However, the return value is '5' which indicates that the usual
>> virtual call semantics were used on 'this'. Is this supposed to work?
>> Have anyone tried this?
>>
>> TIA,
>> Jesper
>>
>>