Bob MacCallum wrote:
Hi Nicklas,
I'll double check but I think we're sharing one DbControl across the whole
webapp, so that will be the first place to look.
This will definitely give you a lot of problems since a DbControl is not
thread-safe. You may also run into memory problems since every item that
has been loaded from the database will be stored in a cache. If you
use one DbControl for everything you will end up with the entire
database as Java objects in memory.
In other words, every request to the web application needs it's own
DbControl.
/Nicklas
Thanks for the hint. Will post back when I have a solution.
cheers,
Bob.
Nicklas Nordborg writes:
Bob MacCallum wrote:
Quick follow up to:
http://www.mail-archive.com/basedb-devel@lists.sourceforge.net/msg00316.html
The problem seems to be triggered by concurrent access to our BASE-based
web
application (for example, me and googlebot).
That doesn't bring me any closer to understanding what exactly is going
on,
but I thought I would share.
I wonder if similar stacktraces occur on a busy multi-user BASE server?
Are you sharing objects (eg. an ItemQuery, DbControl, etc.) between
different threads? I think the problem can be caused by multiple threads
that are accessing the same non-threadsafe object at the same time.
/Nicklas
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