If a resource adapter generates a ConnectionErrorOccured event, the Application Server considers the connection invalid and removes the connection from the connection pool. Typically, a resource adapter generates a ConnectionErrorOccured event when it finds a ManagedConnection object unusable. Reasons can be network failure with the EIS, EIS failure, fatal problems with resource adapter, and so on. If the fail-all-connections property in the connection pool configuration is set to true, all connections are destroyed and the pool is recreated.
You can set the fail-all-connections configuration property during creation of a connector connection pool. Or, you can use the asadmin set command to dynamically reconfigure a previously set property. For details, see the Sun Java System Application Server Enterprise Edition 8.1 2005Q2 Reference Manual.
The interface ValidatingManagedConnectionFactory exposes the method getInvalidConnections to allow retrieval of the invalid connections. The Application Server checks if the resource adapter implements this interface, and if it does, invalid connections are removed when the connection pool is resized.