Re: [JBoss-user] JBOSS dynamic ql problem results order differen t with different JVM ???

[Dain S. <da...@da...>]

JB4 uses a LinkedHashSet internally so order is preserved.  
Unfortunately, since this class is only in JDK 1.4 this will not be 
back ported to the 3.x versions.  I was working on my own version of 
this class for 1.3, but gave up.

-dain

On Friday, May 16, 2003, at 09:52 AM, Kevin Conner wrote:

>> Your selector returns a Set:
>>   public abstract Set ejbSelectGeneric(String jbossQl,
>> Object[] arguments)
>> throws FinderException;
>>
>> The iteration order for a Set is not guaranteed so even
>> though the results
>> of the query are ordered this is lost when you iterator over
>> the Set. If you
>> return a Collection then the order should be preserved.
>
> I have to disagree.
>
> The order returned depends solely on the particular implementation
> of the collection/set being used.  The iterator for a TreeSet (in
> order of comparison) will be totally different from a HashSet.
>
> The likely problem is that the set being used within the jbossQL
> is not preserving the order returned in the result set whilst
> removing duplicates, whereas the collection probably does preserve
> the order as it doesn't attempt to remove them.
>
> What version of jboss are we talking about here?
> 	Kev
>
> Kevin Conner
> This is a personal e-mail. Any views or opinions presented are
> solely those of the author and do not necessarily represent those
> of Orchard Information Systems Ltd.
>
>
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