Is it a problem if two threads *read* it at the same time? Is anything being 
modified?

-------------------------------------
Jeppe Nejsum Madsen<[email protected]> wrote:

Timothy Perrett <[email protected]> writes:

> The whole Date class in Java is not thread safe. We considered swapping to 
> JodaTime and I know DCB was working on it, but im not sure from the top of my 
> head if he ever committed / merged what he was working on...
>
> Cheers, Tim
>
> On 11 Jan 2010, at 20:10, aw wrote:
>
>> See:  http://java.sun.com/javase/6/docs/api/java/text/SimpleDateFormat.html> 
>> ---------------
>> Synchronization
>> 
>> Date formats are not synchronized. It is recommended to create
>> separate format instances for each thread. If multiple threads access
>> a format concurrently, it must be synchronized externally.
>> ---------------
>> 
>> 
>> Since SimpleDateFormat is not thread-safe, do I potentially have a bug
>> when using TimeHelpers?
>> 
>> For example, see the Chat.scala example -- see "line" where it binds
>> "when" -> hourFormat(c.when)...  Is there a potential problem there
>> that multiple threads will be running the snippet and accessing the
>> same underlying SimpleDateFormat?

Yes, I think it's a typo that hourFormat is a val an not a def (like the
rest of the formats)

/Jeppe
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