This is almost definitely caused by the attachment not saving properly. Despite 
the failure to save,
the cache holds the attachment for a time but eventually it is cleared and the 
attachment appears to
vanish. The cache inconsistency is fixed as of 2.5M1.

As far as the attachment not saving properly and showing no sign, usually we 
start by blaming mysql
max_packet_size. If you upload an attachment about the size of the largest 
attachment you ahve
uploaded so far, check the tomcat log and you will probably see an exception 
trace. This will tell
you what caused the problem.

Caleb

On 10/05/2010 02:04 PM, Ramon Gomes Brandão - SERINT wrote:
> Hi, 
> 
>  
> 
> I'm facing some trouble with attachments becoming empty (zero bytes) after 
> some time they were uploaded. I'm using XWiki Enterprise 2.4.30451. I've 
> searched the mail archives and it seems to exist a bug in the cache 
> coherency. I could not find anything related on JIRA. 
> 
>  
> 
> My -Xms and -Xmx are both 768m. Although my max packet size on MySQL is 20Mb 
> for attachments, the files that are becoming empty are docs, pictures and 
> xls's of a few Kbytes. 
> 
>  
> 
> Can someone point me some cause and solution on this please? 
> 
>  
> 
> Regards, 
> 
>  
> 
> Ramon Gomes Brandão
> 
>  
> 
> _______________________________________________
> users mailing list
> users@xwiki.org
> http://lists.xwiki.org/mailman/listinfo/users
> 

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