database - Oracle 11g vs Oracle 12c JDBC connection string -

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we have 2 jdbc connection strings, first oracle 11g database: 

jdbc:oracle:thin:@[hostname]:[port]:[service_name]

second 1 oracle 12c database:

jdbc:oracle:thin:@(description=(failover=on)(connect_timeout=5)(transport_connect_timeout=3)(retry_count=3) (address_list=(load_balance=off) (address=(protocol=tcp)(host=<primary_db_hostname>)(port=<db_port>)) (address=(protocol=tcp)(host=<secondary_db_hostname>)(port=<db_port>))) (connect_data=(service_name=<service_name>)))   

second connection string says failover mechanism in place, if primary db fails, have still second 1 should automatically take load.

question: possible first connection string ensures failover mechanism, hidden client , configured in database internals?





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