Broken JDBC driver?

Can anyone tell me what circumstances can produce a long list of messages like this? 2010-03-24 14:43:56.822 ERROR - CONNECTIONBUS_RETRIEVE: JDBCDataStore::execRetrieveQuery catched SQLException without error number; broken JDBC driver? Message: The statement is closed. The driver seems to be fine and the application has been running for some time quite happily. It also doesn't seem to happen on all servers, the box in question has 1600 MB allocated to the JVM
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