Dynamic (i.e responding to methodNotFound) classes in Java

John Rose john.r.rose at oracle.com
Fri Jun 14 02:05:48 UTC 2013

On Jun 13, 2013, at 6:26 PM, Behrang Saeedzadeh <behrangsa at gmail.com> wrote:

> Hi,
> A couple of years ago I downloaded an experimental build of JDK with
> invokedynamic support and it contained a class (DynamicObject?) that any
> method could be invoked on its subclasses without any compile time errors.
> Does this class still exist? I can't find it anymore in the API docs.

No.  There were partial prototypes in this direction as part of JSR 292, but they were abandoned in 2009.  Here is a proposal from that time frame:

Nothing like this exists or was built in any usable way.

Untyped or "duck typed" invocation of objects can be done easily enough with third-party libraries, or with reflection, or using a dynamic language like JavaScript or JRuby or ${your_favorite_jvm_language}.

In my opinion, Java the language is unlikely to support such a thing in the near future, since there are many reasonable alternatives.

— John

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