On 2/8/12 6:27 AM, Katherine Marsden wrote:
On 2/8/2012 2:15 AM, Kristian Waagan wrote:
On 08.02.2012 11:01, Knut Anders Hatlen wrote:
<snip>
This deadlock does not happen in Java 6 because the getConnection()
method is no longer synchronized, and the synchronized section in
getDriver() has been narrowed down (and in Java 7 it's completely
removed).
We had the same problem in the replication test code at some point. I
can't remember what was done to fix it, maybe the code was
restructured to avoid the problem altogether.
We had this problem in Network Server initially if client was in the
same jvm. The solution was to avoid using Driver Manager in
internally all together and let the user have the DriverManagerLock.
In NetworkServerControlImpl we have:
// start the server.
cloudscapeDriver = (Driver)
Class.forName(CLOUDSCAPE_DRIVER).newInstance();
and then use that Driver for getting connections.
Thanks Kathey, Knut, and Kristian. The discussion and experiments were
very helpful. I can reproduce this hang on Linux on Java 5 using the
short test case attached to newly filed DERBY-5607.
Thanks,
-Rick
