On Jan 4, 2010, at 1:29 PM, JN wrote:

> 
> Thanks everyone for the discussion.   I see people are very zealous
> about their particular approaches.  Don't need to preach to me, just
> looking for technical answers.
> 
> On Dec 31 2009, 3:53 pm, Eelco Hillenius <[email protected]>
> wrote:
>>> I have no problem with annotations in general.  Here are my concerns:
>>> - don't want code to depend on guice; jsr would be better here, for
>>> the @Inject; but this issue is minor compared to the others
>> 
>> They are annotations, not interfaces.
> 
> My concern still stands.

The point they were trying to make is that annotations aren't required at 
runtime in the same fashion that interfaces are. You can load a class that uses 
annotations without the annotations having to be in the classpath. The same 
holds true during compilation. This was a feature that was added in 1.6 I 
believe. 


> 
>> 
>>> - don't want interfaces coupled to implementations (referring to some
>>> of the apparently optional annotations which I wouldn't use)
>> 
>> You couple it to a default, which you can override in your modules.
>> That means that you can avoid a lot of configuration when part of your
>> infrastructure runs fine with defaults. Great future, but still
>> something that people seem to misinterpret.
> 
> And that's something I don't want to do.  I'm not misinterpreting it,
> I understand it very well.

You can always bind all interfaces to implementations in your module and avoid 
the @ImplementedBy annotation. However, you can use this annotation to provide 
defaults and then load the interface class without needing the annotation in 
the classpath.

I guess I'm still wondering what your primary concerns with the annotations 
are. Could you elaborate on that?

-bp


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