I've been using the JDBC driver and have recently noticed that under load, calls to DriverManager.getConnection() will sometimes appear to hang.

I was able to resolve this problem by serializing access to getConnection() using a synchronized block.  I haven't had a chance to dig through the JDBC driver code to see what would account for this, but I figured I'd make you aware just in case someone else runs into this.

Cheers,
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