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From "Alex Karasulu" <aok...@bellsouth.net>
Subject FYI FW: [OT] Bug in NIO
Date Thu, 19 Feb 2004 07:55:02 GMT
Just wanted to get this last piece of embarrassing material out to 
my friends her at the directory project.  Yeah I blew a good 2 hours
for nothing on this one.  But its not a bug but actually how it should
work.  It spooked me but it will never happen again :-).

Alex

> -----Original Message-----
> From: Boon Hian Tek [mailto:btek@cox.net]
> Sent: Thursday, February 19, 2004 2:04 AM
> To: Avalon Developers List
> Subject: Re: [OT] Bug in NIO
> 
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Hi Alex,
> 
> Alex Karasulu wrote:
> | I think I found a bug in NIO but I'm seeing double right now
> | after chasing it for so long.  The bug has to do with a simple
> | hashCode function - nothing really to do with the core operations
> | of the API.
> |
> | I was wondering if others can look at this junit testcase I have here
> | and perhaps even run it to confirm that I'm not smoking crack.
> | I this really a bug?
> |
> | The test is simply this here:
> |
> |     public void testBufferHashing() throws Exception
> |     {
> |         HashMap l_map = new HashMap() ;
> |
> |         for( int ii = 0; ii < 10; ii++ )
> |         {
> |             ByteBuffer l_buf = ByteBuffer.allocateDirect( 4096 ) ;
> |             l_map.put( l_buf, new Integer( ii ) ) ;
> |         }
> |
> |         assertTrue( l_map.size() == 10 ) ;
> |     }
> |
> | Seems like there's a hashCode problem with the direct buffer.
> |
> | Thanks in advance,
> | Alex
> 
> "Because buffer hash codes are content-dependent, it is inadvisable to
> use buffers as keys in hash maps or similar data structures unless it is
> known that their contents will not change."
> 
> http://java.sun.com/j2se/1.4.2/docs/api/java/nio/ByteBuffer.html#hashCode(
> )
> 
> The equals method evaluate two empty buffers as equals.
> 
> I don't think this is a bug.
> 
> My 2 cents.
> 
> Boon
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