Restoring failed database nodes manually

[newbie0322]

So if there is a database server outage, the database nodes are marked as inactive. But if the database server is back up, I still get an exception "No active databases".

org.springframework.jdbc.UncategorizedSQLException: StatementCallback; uncategorized SQLException     
for SQL [SELECT CAST(SERVERPROPERTY('ServerName') as varchar(50)) + ':' + DB_NAME()]; SQL state 
[null]; error code [0]; No active databases in cluster cluster01; nested exception is 
java.sql.SQLException: No active databases in cluster cluster01

The issue is resolved when I restart the web app and it gets a new connection. I read in the documentation that we can have a auto-activation schedule, to detect failed nodes and have them marked as active again. is it possible to do manually ?

And also is it a good idea, to wrap some logic and check if there is 'UncategorizedSQLException' to try to obtain a new connection object and may be mark the node as active again ?