Avoiding sun.misc.Unsafe and embracing modules in Java libraries: missing links

Stephen Colebourne scolebourne at joda.org
Mon Apr 9 10:56:20 UTC 2018

On 9 April 2018 at 08:33, Alan Bateman <Alan.Bateman at oracle.com> wrote:
>> 2. Java proxies cannot invoke default methods of proxied interfaces
>> The Java proxy API does not currently allow the invocation of an
>> overridden
>> default method since
>> the InvocationHandler API only supplies an instance of
>> java.lang.reflection.Method.
> The issue of Proxies and default methods has come up on core-libs-dev a few
> times.

I hit this problem just today but am on Java 8, so Java 9 solutions
are no good. The standard Java 8 workaround requires setAccessible. I
found an alternative that is useful in some cases, but was worth
documenting (as I didn't find it described anywhere else):

I do think Proxy should be enhanced to handle default methods without
use of MethodHandle. Proxy is more of an entry level tool, whereas MH
is lower level. Requiring MH to solve default methods seems wrong for
the typical user of Proxy.


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