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From Stephen McConnell <mcconn...@apache.org>
Subject Re: FYI FW: [OT] Bug in NIO
Date Thu, 19 Feb 2004 12:14:46 GMT
Alex Karasulu wrote:
> 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 :-).

Don't worry - this just puts you in good company!!

Cheers, Steve.


> 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
>>-----BEGIN PGP SIGNATURE-----
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>>iD8DBQFANF/iNJFBtmCH2hIRAtTbAKCHvROEHkxHkkumZMwqaawDG0NRXgCfcpiO
>>J9WOcMrA/inmDpD0X2M6hJQ=
>>=BCf5
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>>
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> 
> 
> 
> 
> 


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