sfc-gh-rpaulin commented on PR #10670:
URL: https://github.com/apache/nifi/pull/10670#issuecomment-3682355730

   Did a bit more digging on the Postgresql JDBC side to see if the Hikari 
approach could be used and it does look like Hikari is expecting the driver to 
still be registered as the list only considers registered drivers.  The 
registration is happening at classload as @turcsanyip mentioned is the common 
case [1].  So I think this PR can be taken as is.  There is a argument that the 
explicit register call in the DBCPConnectionService class could be removed but 
I think there could be an argument to leave it for "legacy" drivers.  This does 
however raise that since this is happening within the Driver itself a second 
issue to review the HikariCPConnectionPool for the same issue is appropriate.  
I do not see any calls within the Hikari library to manage the deregister so it 
is very likely that the reference would remain in the DriverManager without an 
explicit call.
   
   
   [1] 
https://github.com/pgjdbc/pgjdbc/blob/3609468d1422de2bb5ea989db4c9de706bb1c4ed/pgjdbc/src/main/java/org/postgresql/Driver.java#L76


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