proxy an interface and call a default method

[Peter Levart]

Hi,

I think the main problem here is that by providing the InvocationHandler 
with a Lookup that could provide "invokespecial" MHs for the proxy 
interface(s) could be abused. Anyone can create a Proxy for any public 
interface and supply its own InvocationHandler which could be used to 
"steal" such Lookup object.

There would have to be a way to restrict calling interface "super" 
methods from InvocationHandler *INSTANCES* that are bound to particular 
Proxy instances.

Hm...

Regards, Peter

On 05/26/2016 08:20 AM, Jochen Theodorou wrote:
> Hi all,
>
> I am looking for a solution to the following problem... I have an 
> interface and an object that is supposed to serve as implementation, 
> but does not implement the interface. n methods of the interface will 
> be redirected to the object, but in case of default methods I would 
> like to have the implementation provided by the interface. I am 
> looking especially for a solution without me generating classes at 
> runtime by hand.
>
> Now there are several problems... I seem not to be able to invoke a 
> default method by reflection. By MethodHandles I did something like this:
>
>> MethodHandles.Lookup.class.getDeclaredConstructor(Class.class, 
>> int.class).
>>       newInstance(interfaceClass, MethodHandles.Lookup.PRIVATE).
>>       unreflectSpecial(method, interfaceClass).
>>       bindTo(receiver);
>
> where receiver is a dynamic proxy, method the Method of the default 
> method, interfaceClass the Class of the interface with the default 
> method.
>
> But I am calling a private constructor here, which is bad, plus the 
> above procedure does no longer work on JDK9.
>
> So what am I supposed to do? change from a proxy to runtime generated 
> classes and hope the best for classloaders and modules not getting in 
> my way?
>
> bye Jochen
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