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Re: problem with java.util.Map
Hi Falko,
Thanks very much for the clear and thorough explanation. I'll keep this in
mind as I redesign my app for ozone.
cheers,
don
>From: Falko Braeutigam <falko@smb-tec.com>
>To: "Don Berendsen" <donberendsen@hotmail.com>, ozone-users@ozone-db.org
>Subject: Re: problem with java.util.Map
>Date: Thu, 10 Aug 2000 14:03:47 +0200
>
>On Sun, 06 Aug 2000, Don Berendsen wrote:
> > I've run into some problems using TreeMaps with ozone 0.5.3, Java 1.3,
> > Win98.
> >
> > Trying to return any entrySet (or keySet) results in a
> > java.lang.NullPointerException. Is this a programming error? See example
> > below.
>
>The entrySet() method of TreeMap returns an inner class that represents an
>_stateless_ set view on the map. When returning this inner class from an
>database method, ozone tries to serialize it in order to return it to the
>client. This does not work.
>
>Try to make a new set, put all the entries from the TreeMap into it and
>return
>this new set to the client. This should work but it would run slow and is
>probably not what you want because changes to this new set are not
>reflected in
>the map and vice versa.
>
>So, the best solution would be to put the code that deals with the set
>right on
>the server inside a method of MapTesterImpl.
>
>
>Falko
>--
>______________________________________________________________________
>Falko Braeutigam mailto:falko@smb-tec.com
>SMB GmbH http://www.smb-tec.com
>
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