What is the ping error related to JDBC connection pool in Glassfish?

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The ping error related to JDBC connection pool in Glassfish is commonly displayed as "Ping Connection Pool Failed for [name of connection pool]". This error message indicates that Glassfish was unable to successfully test the connection to the database using the ping test. This could be due to a variety of reasons, including network issues, database connectivity issues, or configuration problems in the connection pool settings.