from：http://b0r0j0.blogbus.com/logs/1750565.html
测试成功的已创建的数据池，重新点击测试时报：
Warning! Connectivity to backend database not verified. This is either because required connection pool attributes "TestConnectionsOnReserve" or "TestConnectionsOnRelease" have not been enabled, or an invalid value has been specified for attribute "TestTableName". Please check the server log for more details..
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将连接池Configuration里的 Connections的高级选项Advanced Options
中的测试选项选中Test Reserved Connections、Test Created Connections、Test Released Connections这样就应该可以了，三个选项可以不用都选但Test Reserved Connections和Test Released Connections必须选中一项，否则测试就会出现你所说的问题。如果你要指定Test Frequency并将Test Reserved Connections、Test Created Connections、Test Released Connections这三项都启用，必须为Test Table Name指定一个值
