What does it mean when Tomcat 7 throws a PooledConnection Exception with a warning for Connection Abandoned?

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When Tomcat 7 throws a PooledConnection Exception with a warning for Connection Abandoned, it means that a database connection was not properly closed or released back to the connection pool. This can happen if the application code did not explicitly call the close() method on the database connection object, or if there was a problem with the connection itself that prevented it from being properly closed. The warning message indicates that the connection pool is tracking abandoned connections and is reporting this issue as a warning to avoid potential resource leaks or other problems. It is important to investigate and address this issue quickly to ensure that the application is not adversely affecting database performance or stability.