Re: [aspectj-users] InterType: introducing serialVersionUID into @Persis

[Alexandru Popescu <the.mindstorm.mailinglist@xxxxxxxxx>]

#: Tomasz Nazar changed the world a bit at a time by saying on  9/19/2005 12:04 PM :#
> Hi there!
>
> I have slight problem with introducing 
> 'static final long serialVersionUID = 17L' into any class
> that is marked with @Persistable interface.
>
> 'final' and 'static' are the keywords here.
>
> Error message is of course: "static inter-type field on interface not
> supported".
>
> The question is why isn't this supported, or better how to achieve
> introduction of 'static final long' into a _class_ (if possible).
>
>
> MyAspect.aj:
>     declare parents @Persistable * implements java.io.Serializable;
>     //static final @Persistable.serialVersionUID = 17L; <- won't work
>
>     //static final ConcretePojo.serialVersionUID = 17L; <- will work,
>     //but not what I need
>
>
> I know it's a rare case where one needs to introduce that field, but ..
> it's my case. Thanks for any feedback.
>
> Tomasz

According to www.eclipse.org/aspectj/doc/next/adk15notebook/annotations-itds.html an annotation type 
cannot be the target of an inter-type declaration. What you need is to push your ITD on an type 
annotated with @Persistable.

So you probably need a marker interface and than do the ITD:

interface PersistenceAware {};

declare parents @Persistable * implements java.io.Serializable;
declare parents @Persistable * implements PersistenceAware;

static final PersistenceAware.serialVersionUID = 17L;

hth,
./alex
--
.the_mindstorm.


ps: the aboves have not been tested, but at least they represent my expectations :-)