If a resource adapter generates a ConnectionErrorOccured event, the Enterprise 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.
The is-connection-validation-required property specifies whether connections have to be validated before being given to the application. If a resource’s validation fails, it is destroyed, and a new resource is created and returned.
You can set the fail-all-connections and is-connection-validation-required configuration properties 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 GlassFish Enterprise Server 2.1 Reference Manual.
The interface ValidatingManagedConnectionFactory exposes the method getInvalidConnections to allow retrieval of the invalid connections. The Enterprise Server checks if the resource adapter implements this interface, and if it does, invalid connections are removed when the connection pool is resized.