You can test a JDBC connection pool for usability in one of these ways:
In the Administration Console, open the Resources component select Connection Pools, and select the connection pool you want to test. Then select the Ping button in the top right corner of the page. For details, click the Help button in the Administration Console.
Use the asadmin ping-connection-pool command. For details, see the Sun GlassFish Enterprise Server v3 Prelude Reference Manual.
Both these commands fail and display an error message unless they successfully connect to the connection pool.