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long time not to use connection, mysql server side will disconnect it, when druid invoke isClosed() to check connection state, aws jdbc driver throw exception, how ...

Java code can be difficult to test for thread safety when multithreading. The article at http://www.planetgeek.ch/2009/08/25/how-to-find-a-concurrency-bug-with-java ...

Unit testing is as an integral part of extreme programming, and many open source tools and frameworks help developers write unit tests. IDE plug-ins can create skeleton unit test cases, and Ant tasks ...