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Re: Collection-problem [Re: opp bug?]
On Sun, 10 Dec 2000, Andreas Monitzer wrote:
> On Sunday, December 10, 2000, at 12:48 AM, Don Berendsen wrote:
>
> > Falko,
> >
> > Is this a case where HashTable.values() returns an inner class as happens
> > with java.util.HashMap?
>
> Yes, it's a java.util.Collection$SynchronizedCollection
>
> > In my application I wasn't able to return the
> > results of values() or keys() when using a HashMap. I got around this by
> > putting the map in a variable and using
> >
> > public Collection values(){
> > return new ArrayList(map.values());
> > }
>
> Thanks. Seems like ozone doesn't like Collections (had the same problem with
> a vector). Maybe a hint in the documentation would be nice (next to the note
> that you can't use iterators/enumerations).
Guys, serializing just an inner class (without the outer one) never works in
Java. We have to provide a solution for mentioned collection problem but in
general the problems of serializing inner classes are not caused by ozone.
The semantics of inner classes is different from C++ where this might work.
Also, I cannot state in the docs that iterators not work in ozone. This
wouldn't be true. It _is_ true that there is an architectural difference
between ordinary Java object and database objects, which causes problems when
returning ordinary iterators from database objects. But I _did_ try to explain
this in the docu already. But the developer itself is never a good docu writer.
I asked for help with this very often...
Falko
--
______________________________________________________________________
Falko Braeutigam mailto:falko@smb-tec.com
SMB GmbH http://www.smb-tec.com