While loadtesting with a mix of calls to our various APIs, the clients locked up and the log said out of memory. This surprised us, because we had never seen out of memory in the logs before, only in a command window--and not at all when running as a service. It turned out that what had actually happened was that the pool of database connections had been exhausted. Enlarging the database pool fixed the problem, but we were very lucky to have been able to diagnose the problem, particularly because the out of memory error was so misleading (and because we couldn't turn on logging, because that serialized requests, making the problem go away). We wasted several days trying to chase down a non-existent memory leak. We request that a more useful exception be thrown (something like Database Connection Pool Size Exhausted would have been a huge help) and/or that the pool size automatically grow in response to load. This is our first bug report, so we're not sure if this is how bugs are supposed to be reported. If not, please provide guidance for how to properly submit bug reports, and we will follow that procedure from now one (we tried to find instructions on the site, but didn't see anything about bug reporting). We searched the site for any mention of database connection pool and out of memory error, but didn't find anything. Are we the first to report this problem? We are using version 3.0.7. Is this problem already fixed in a later version?
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